Accelerated Environmental Testing Technology

2025-05-12

Traditional environmental testing is based on the simulation of real environmental conditions, known as environmental simulation testing. This method is characterized by simulating real environments and incorporating design margins to ensure the product passes the test. However, its drawbacks include low efficiency and significant resource consumption.

Accelerated Environmental Testing (AET) is an emerging reliability testing technology. This approach breaks away from traditional reliability testing methods by introducing a stimulation mechanism, which significantly reduces testing time, improves efficiency, and lowers testing costs. The research and application of AET hold substantial practical significance for the advancement of reliability engineering.

Accelerated Environmental Testing

Stimulation testing involves applying stress and rapidly detecting environmental conditions to eliminate potential defects in products. The stresses applied in these tests do not simulate real environments but are instead aimed at maximizing stimulation efficiency.

Accelerated Environmental Testing is a form of stimulation testing that employs intensified stress conditions to assess product reliability. The level of acceleration in such tests is typically represented by an acceleration factor, defined as the ratio of a device's lifespan under natural operating conditions to its lifespan under accelerated conditions.

The stresses applied can include temperature, vibration, pressure, humidity (referred to as the "four comprehensive stresses"), and other factors. Combinations of these stresses are often more effective in certain scenarios. High-rate temperature cycling and broadband random vibration are recognized as the most effective forms of stimulation stress. There are two primary types of accelerated environmental testing: Accelerated Life Testing (ALT) and Reliability Enhancement Testing (RET).

Reliability Enhancement Testing (RET) is used to expose early failure faults related to product design and to determine the product's strength against random failures during its effective lifespan. Accelerated Life Testing aims to identify how, when, and why wear-out failures occur in products.

Below is a brief explanation of these two fundamental types.

1. Accelerated Life Testing (ALT) : Environmental Test Chamber

Accelerated Life Testing is conducted on components, materials, and manufacturing processes to determine their lifespan. Its purpose is not to expose defects but to identify and quantify the failure mechanisms that lead to product wear-out at the end of its useful life. For products with long lifespans, ALT must be conducted over a sufficiently long period to estimate their lifespan accurately.

ALT is based on the assumption that the characteristics of a product under short-term, high-stress conditions are consistent with those under long-term, low-stress conditions. To shorten testing time, accelerated stresses are applied, a method known as Highly Accelerated Life Testing (HALT).

ALT provides valuable data on the expected wear mechanisms of products, which is crucial in today's market, where consumers increasingly demand information about the lifespan of the products they purchase. Estimating product lifespan is just one of the uses of ALT. It enables designers and manufacturers to gain a comprehensive understanding of the product, identify critical components, materials, and processes, and make necessary improvements and controls. Additionally, the data obtained from these tests instills confidence in both manufacturers and consumers.

ALT is typically performed on sampled products.

2. Reliability Enhancement Testing (RET)

Reliability Enhancement Testing goes by various names and forms, such as step-stress testing, stress life testing (STRIEF), and Highly Accelerated Life Testing (HALT). The goal of RET is to systematically apply increasing levels of environmental and operational stress to induce failures and expose design weaknesses, thereby evaluating the reliability of the product design. Therefore, RET should be implemented early in the product design and development cycle to facilitate design modifications.

Researchers in the field of reliability noted in the early 1980s that significant residual design defects offered considerable room for reliability improvement. Additionally, cost and development cycle time are critical factors in today's competitive market. Studies have shown that RET is one of the best methods to address these issues. It achieves higher reliability compared to traditional methods and, more importantly, provides early reliability insights in a short time, unlike traditional methods that require prolonged reliability growth (TAAF), thereby reducing costs.

#Environmental Test Chamber #AET chamber #Four Comprehensive Stresses chamber #Product Reliability Evaluation #QUV Accelerated Weathering Tester #Environmental Stress Screening

Constant Temperature and Humidity Chamber Selection Guide

2025-05-12

Dear Valued Customer,

To ensure you select the most cost-effective and practical equipment for your needs, please confirm the following details with our sales team before purchasing our products:

Ⅰ. Workspace Size

The optimal testing environment is achieved when the sample volume does not exceed 1/5 of the total chamber capacity. This ensures the most accurate and reliable test results.

Ⅱ. Temperature Range & Requirements

Specify the required temperature range.
Indicate if programmable temperature changes or rapid temperature cycling is needed. If yes, provide the desired temperature change rate (e.g., °C/min).

Ⅲ. Humidity Range & Requirements

Define the required humidity range.
Indicate if low-temperature and low-humidity conditions are needed.
If humidity programming is required, provide a temperature-humidity correlation graph for reference.

Ⅳ. Load Conditions

Will there be any load inside the chamber?
If the load generates heat, specify the approximate heat output (in watts).

Ⅴ. Cooling Method Selection

Air Cooling – Suitable for smaller refrigeration systems and general lab conditions.
Water Cooling – Recommended for larger refrigeration systems where water supply is available, offering higher efficiency.

The choice should be based on lab conditions and local infrastructure.

Ⅵ. Chamber Dimensions & Placement

Consider the physical space where the chamber will be installed.
Ensure the dimensions allow for easy access room, transportation, and maintenance.

Ⅶ. Test Shelf Load Capacity

If samples are heavy, specify the maximum weight requirement for the test shelf.

Ⅷ. Power Supply & Installation

Confirm the available power supply (voltage, phase, frequency).
Ensure sufficient power capacity to avoid operational issues.

Ⅹ. Optional Features & Accessories

Our standard models meet general testing requirements, but we also offer:

1.Customized fixtures
2.Additional sensors
3.Data logging systems
4.Remote monitoring capabilities
5.Specify any special accessories or spare parts needed.

Ⅺ. Compliance with Testing Standards

Since industry standards vary, please clearly specify the applicable testing standards and clauses when placing an order. Provide detailed temperature/humidity points or special performance indicators if required.

Ⅺ. Other Custom Requirements

If you have any unique testing needs, discuss them with our engineers for tailored solutions.

Ⅻ. Recommendation: Standard vs. Custom Models

Standard models offer faster delivery and cost efficiency.
However, we also specialize in custom-built chambers and OEM solutions for specialized applications.

For further assistance, contact our sales team to ensure the best configuration for your testing requirements.

GUANGDONG LABCOMPANION LTD

Precision Engineering for Reliable Testing

#Environmental Test Chamber #Thermal Cycling Test Chamber #Constant Temperature and Humidity Chamber #Programmable Temperature and Humidity Chamber #Custom Environmental Testing Equipment #Temperature and Humidity Stability Chamber

Environmental Testing Methods

2025-05-12

"Environmental testing" refers to the process of exposing products or materials to natural or artificial environmental conditions under specified parameters to evaluate their performance under potential storage, transportation, and usage conditions. Environmental testing can be categorized into three types: natural exposure testing, field testing, and artificial simulation testing. The first two types of testing are costly, time-consuming, and often lack repeatability and regularity. However, they provide a more accurate reflection of real-world usage conditions, making them the foundation for artificial simulation testing. Artificial simulation environmental testing is widely used in quality inspection. To ensure comparability and reproducibility of test results, standardized methods for basic environmental testing of products have been established.

Below are the environmental tests methods that can achieve by using environmental test chamber:

(1) High and Low Temperature Testing: Used to assess or determine the adaptability of products to storage and/or use under high and low temperature conditions.

(2) Thermal Shock Testing: Determines the adaptability of products to single or multiple temperature changes and the structural integrity under such conditions.

(3) Damp Heat Testing: Primarily used to evaluate the adaptability of products to damp heat conditions (with or without condensation), particularly focusing on changes in electrical and mechanical performance. It can also assess the product's resistance to certain types of corrosion.

Constant Damp Heat Testing: Typically used for products where moisture absorption or adsorption is the primary mechanism, without significant respiration effects. This test evaluates whether the product can maintain its required electrical and mechanical performance under high temperature and humidity conditions, or whether sealing and insulating materials provide adequate protection.

Cyclic Damp Heat Testing: An accelerated environmental test to determine the product's adaptability to cyclic temperature and humidity changes, often resulting in surface condensation. This test leverages the product's "breathing" effect due to temperature and humidity changes to alter internal moisture levels. The product undergoes cycles of heating, high temperature, cooling, and low temperature in a cyclic damp heat chamber, repeated as per technical specifications.

Room Temperature Damp Heat Testing: Conducted under standard temperature and high relative humidity conditions.

(4) Corrosion Testing: Evaluates the product's resistance to saltwater or industrial atmospheric corrosion, widely used in electrical, electronic, light industry, and metal material products. Corrosion testing includes atmospheric exposure corrosion testing and artificial accelerated corrosion testing. To shorten the testing period, artificial accelerated corrosion testing, such as neutral salt spray testing, is commonly used. Salt spray testing primarily assesses the corrosion resistance of protective decorative coatings in salt-laden environments and evaluates the quality of various coatings.

(5) Mold Testing: Products stored or used in high temperature and humidity environments for extended periods may develop mold on their surfaces. Mold hyphae can absorb moisture and secrete organic acids, degrading insulation properties, reducing strength, impairing optical properties of glass, accelerating metal corrosion, and deteriorating product appearance, often accompanied by unpleasant odors. Mold testing evaluates the extent of mold growth and its impact on product performance and usability.

(6) Sealing Testing: Determines the product's ability to prevent the ingress of dust, gases, and liquids. Sealing can be understood as the protective capability of the product's enclosure. International standards for electrical and electronic product enclosures include two categories: protection against solid particles (e.g., dust) and protection against liquids and gases. Dust testing checks the sealing performance and operational reliability of products in sandy or dusty environments. Gas and liquid sealing testing evaluates the product's ability to prevent leakage under conditions more severe than normal operating conditions.

(7) Vibration Testing: Assesses the product's adaptability to sinusoidal or random vibrations and evaluates structural integrity. The product is fixed on a vibration test table and subjected to vibrations along three mutually perpendicular axes.

(8) Aging Testing: Evaluates the resistance of polymer material products to environmental conditions. Depending on the environmental conditions, aging tests include atmospheric aging, thermal aging, and ozone aging tests.

Atmospheric Aging Testing: Involves exposing samples to outdoor atmospheric conditions for a specified period, observing performance changes, and evaluating weather resistance. Testing should be conducted in outdoor exposure sites that represent the most severe conditions of a particular climate or approximate actual application conditions.

Thermal Aging Testing: Involves placing samples in a thermal aging chamber for a specified period, then removing and testing their performance under defined environmental conditions, comparing results to pre-test performance.

(9) Transport Packaging Testing: Products entering the distribution chain often require transport packaging, especially precision machinery, instruments, household appliances, chemicals, agricultural products, pharmaceuticals, and food. Transport packaging testing evaluates the packaging's ability to withstand dynamic pressure, impact, vibration, friction, temperature, and humidity changes, as well as its protective capability for the contents.

These standardized testing methods ensure that products can withstand various environmental stresses, providing reliable performance and durability in real-world applications.

#Vibration Test Chamber #Environmental Testing Chamber #High and Low Temperature Chamber #Thermal Shock Chamber #Cyclic Damp Heat Chamber #Combined Environmental Test Chamber

HUMIDITY & TEMPERATURE TEST CHAMBER OPERATIONAL GUIDELINES

2025-05-12

1.Equipment Overview

The Humidity & Temperature Test Chamber, also known as an Environmental Simulation Testing Apparatus, is a precision instrument requiring strict adherence to operational protocols. As a Class II electrical device compliant with IEC 61010-1 safety standards, its reliability (±0.5°C temperature stability), precision (±2% RH humidity accuracy), and operational stability are critical for obtaining ISO/IEC 17025 compliant test results.

2.Pre-Operation Safety Protocols

2.1 Electrical Requirements

Power supply: 220V AC ±10%, 50/60Hz with independent grounding (ground resistance ≤4Ω)
Install emergency stop circuit and overcurrent protection (recommended 125% of rated current)
Implement RCD (Residual Current Device) with tripping current ≤30mA

2.2 Installation Specifications

Clearance requirements:

Rear: ≥500mm

Lateral: ≥300mm

Vertical: ≥800mm

Ambient conditions:

Temperature: 15-35°C

Humidity: ≤85% RH (non-condensing)

Atmospheric pressure: 86-106kPa

Stainless steel Humidity & Temperature Test Chamber

3.Operational Constraints

3.1 Prohibited Environments

Explosive atmospheres (ATEX Zone 0/20 prohibited)
Corrosive environments (HCl concentration >1ppm)
High particulate areas (PM2.5 >150μg/m³)
Strong electromagnetic fields (>3V/m at 10kHz-30MHz)

4.Commissioning Procedures

4.1 Pre-Start Checklist

Verify chamber integrity (structural deformation ≤0.2mm/m)
Confirm PT100 sensor calibration validity (NIST traceable)
Check refrigerant levels (R404A ≥85% of nominal charge)
Validate drainage system slope (≥3° gradient)

5.Operational Guidelines

5.1 Parameter Setting

Temperature range: -70°C to +150°C (gradient ≤3°C/min)
Humidity range: 20% RH to 98% RH (dew point monitoring required >85% RH)
Program steps: ≤120 segments with ramp soak control

5.2 Safety Interlocks

Door-open shutdown (activation within 0.5s)
Over-temperature protection (dual redundant sensors)
Humidity sensor failure detection (auto-dry mode activation)

6.Maintenance Protocol

6.1 Daily Maintenance

Condenser coil cleaning (compressed air 0.3-0.5MPa)
Water resistivity check (≥1MΩ·cm)
Door seal inspection (leak rate ≤0.5% vol/h)

6.2 Periodic Maintenance

Compressor oil analysis (every 2,000 hours)
Refrigerant circuit pressure test (annual)
Calibration cycle:

Temperature: ±0.3°C (annual)

Humidity: ±1.5% RH (biannual)

7.Failure Response Matrix

Symptom Priority	Priority	Immediate Action	Technical Response
Uncontrolled heating	P1	Activate emergency stop	Check SSR operation (Vf <1.5V)
Humidity oscillation	P2	Initiate auto-dry cycle	Verify dew point sensor calibration
Condenser frost	P3	Reduce humidity setpoint	Check expansion valve (ΔT 5-8°C)
Water level alarm	P2	Refill with DI water	Conduct float switch resistance test

8.Decommissioning & Disposal

Refrigerant recovery per EPA 608 regulations
PCB disposal compliant with RoHS Directive 2011/65/EU
Steel components recycling (≥95% recovery rate)

9.Compliance Standards

Safety: UL 61010-2-011, EN 60204-1
EMC: FCC Part 15 Subpart B, EN 55011
Performance: ASTM D4332, IEC 60068-3-5

#Constant Temperature and Humidity Test Chamber #Safe Operation for chamber #Troubleshooting for chamber #Calibration and Inspection for chamber #Electrical Safety of chamber

IEC 68-2-18 Test R and Guidance Water Testing

2025-05-12

Foreword

The purpose of this test method is to provide procedures for evaluating the ability of electrical and electronic products to withstand exposure to falling drops (precipitation), impacting water (water jets), or immersion during transportation, storage, and use. The tests verify the effectiveness of covers and seals in ensuring that components and equipment continue to function properly during or after exposure to standardized water exposure conditions.

Scope

This test method includes the following procedures. Refer to Table 1 for the characteristics of each test.

Test Method Ra: Precipitation

Method Ra 1: Artificial Rainfall

This test simulates exposure to natural rainfall for electrical products placed outdoors without protection.

Method Ra 2: Drip Box

This test applies to electrical products that, while sheltered, may experience condensation or leakage leading to water dripping from above.

Test Method Rb: Water Jets

Method Rb 1: Heavy Rain

Simulates exposure to heavy rain or torrential downpours for products placed outdoors in tropical regions without protection.

Method Rb 2: Spray

Applicable to products exposed to water from automatic fire suppression systems or wheel splash.

Method Rb 2.1: Oscillating Tube

Method Rb 2.2: Handheld Spray Nozzle

Method Rb 3: Water Jet

Simulates exposure to water discharge from sluice gates or wave splash.

Test Method Rc: Immersion

Evaluates the effects of partial or complete immersion during transportation or use.

Method Rc 1: Water Tank
Method Rc 2: Pressurized Water Chamber

Limitations

Method Ra 1 is based on natural rainfall conditions and does not account for precipitation under strong winds.
This test is not a corrosion test.
It does not simulate the effects of pressure changes or thermal shock.

Test Procedures

General Preparation

Before testing, specimens shall undergo visual, electrical, and mechanical inspections as specified in the relevant standards. Features affecting test results (e.g., surface treatments, covers, seals) must be verified.

Method-Specific Procedures

Ra 1 (Artificial Rainfall):

Specimens are mounted on a support frame at a defined tilt angle (refer to Figure 1).
Test severity (tilt angle, duration, rainfall intensity, droplet size) is selected from Table 2.
Specimens may be rotated (max. 270°) during testing. Post-test inspections check for water ingress.

Ra 2 (Drip Box):

Drip height (0.2–2 m), tilt angle, and duration are set per Table 3.
Uniform dripping (200–300 mm/h) with 3–5 mm droplet size is maintained (Figure 4).

Rb 1 (Heavy Rain):

High-intensity rainfall conditions are applied per Table 4.

Rb 2.1 (Oscillating Tube):

Nozzle angle, flow rate, oscillation (±180°), and duration are selected from Table 5.
Specimens rotate slowly to ensure full surface wetting (Figure 5).

Rb 2.2 (Handheld Spray):

Spray distance: 0.4 ± 0.1 m; flow rate: 10 ± 0.5 dm³/min (Figure 6).

Rb 3 (Water Jet):

Nozzle diameters: 6.3 mm or 12.5 mm; jet distance: 2.5 ± 0.5 m (Tables 7–8, Figure 7).

Rc 1 (Water Tank):

Immersion depth and duration follow Table 9. Water may include dyes (e.g., fluorescein) to detect leaks.

Rc 2 (Pressurized Chamber):

Pressure and time are set per Table 10. Post-test drying is required.

Test Conditions

Water Quality: Filtered, deionized water (pH 6.5–7.2; resistivity ≥500 Ω·m).
Temperature: Initial water temperature within 5°C below specimen temperature (max. 35°C for immersion).

Test Setup

Ra 1/Ra 2: Nozzle arrays simulate rainfall/dripping (Figures 2–4). Fixtures must allow drainage.
Rb 2.1: Oscillating tube radius ≤1000 mm (1600 mm for large specimens).
Rb 3: Jet pressure: 30 kPa (6.3 mm nozzle) or 100 kPa (12.5 mm nozzle).

Definitions

Precipitation (Falling Drops): Simulated rain (droplets >0.5 mm) or drizzle (0.2–0.5 mm).
Rainfall Intensity (R): Precipitation volume per hour (mm/h).
Terminal Velocity (Vt): 5.3 m/s for raindrops in still air.
Calculations:

Mean droplet diameter: D_v≈1.71 R^0.25mm.

Median diameter: D ₅₀ = 1.21 R ^0.19mm.

Rainfall intensity: R = (V × 6)/(A × t) mm/h (where V = sample volume in cm³, A = collector area in dm², t = time in minutes).

Note: All tests require post-exposure inspections for water penetration and functional verification. Equipment specifications (e.g., nozzle types, flow rates) are critical for reproducibility.

#Environmental Test Chamber #Environmental Test Chamber Artificial Rainfall Test #Environmental Test Chamber Spray Test #Environmental Test Chamber Immersion Test #Climate chamber #Environmental Test Chamber IP Code Testing

IEC 68-2-66 Test Method Cx Steady-State Damp Heat (Unpressurized Saturated Vapor)

2025-05-12

Foreword

The purpose of this test method is to provide a standardized procedure for evaluating the resistance of small electrotechnical products (primarily non-hermetic components) by high and low temperature and humid environmental test chamber.

Scope

This test method applies to accelerated damp heat testing of small electrotechnical products.

Limitations

This method is not suitable to verify external effects for specimens, such as corrosion or deformation.

Test Procedure

1. Pre-Test Inspection

Specimens shall undergo visual, dimensional, and functional inspections as specified in the relevant standards.

2. Specimen Placement

Specimens shall be placed in the test chamber under laboratory conditions of temperature, relative humidity, and atmospheric pressure.

3.Bias Voltage Application (if applicable)

If bias voltage is required by the relevant standard, it shall be applied only after the specimen has reached thermal and humidity equilibrium.

4. Temperature and Humidity Ramp-Up

The temperature shall be raised to the specified value. During this period, air in the chamber shall be displaced by steam.
Temperature and relative humidity must not exceed specified limits.
No condensation shall form on the specimen.
Stabilization of temperature and humidity shall be achieved within 1.5 hours. If the test duration exceeds 48 hours and stabilization cannot be completed within 1.5 hours, it shall be achieved within 3.0 hours.

5. Test Execution

Maintain temperature, humidity, and pressure at specified levels as per the relevant standard.
The test duration begins once steady-state conditions are reached.

6. Post-Test Recovery

After the specified test duration, chamber conditions shall be restored to standard atmospheric conditions (1–4 hours).
Temperature and humidity must not exceed specified limits during recovery (natural cooling is permitted).
Specimens shall be allowed to fully stabilize before further handling.

7. In-Test Measurements (if required)

Electrical or mechanical inspections during the test shall be performed without altering test conditions.
No specimen shall be removed from the chamber before recovery.

8. Post-Test Inspection

After recovery (2–24 hours under standard conditions), specimens shall undergo visual, dimensional, and functional inspections per the relevant standard.

Custom Large-view Environmental Chamber

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Test Conditions

Unless otherwise specified, test conditions consist of temperature and duration combinations as listed in Table 1.

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Test Setup

1. Chamber Requirements

A temperature sensor shall monitor chamber temperature.
Chamber air shall be purged with water vapor before testing.
Condensate must not drip onto specimens.

2. Chamber Materials

Chamber walls shall not degrade vapor quality or induce specimen corrosion.

3. Temperature Uniformity

Total tolerance (spatial variation, fluctuation, and measurement error): ±2°C.
To maintain relative humidity tolerance (±5%), temperature differences between any two points in the chamber shall be minimized (≤1.5°C), even during ramp-up/down.

4. Specimen Placement

Specimens must not obstruct vapor flow.
Direct radiant heat exposure is prohibited.
If fixtures are used, their thermal conductivity and heat capacity shall be minimized to avoid affecting test conditions.
Fixture materials must not cause contamination or corrosion.

3. Water Quality

Use distilled or deionized water with:
Resistivity ≥0.5 MΩ·cm at 23°C.
pH 6.0–7.2 at 23°C.
Chamber humidifiers shall be cleaned by scrubbing before water introduction.

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Additional Information

Table 2 provides saturated steam temperatures corresponding to dry temperatures (100–123°C).

Schematic diagrams of single-container and double-container test equipment are shown in Figures 1 and 2.

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Table 1: Test Severity

| Temp. (°C) | RH (%) | Duration (h, -0/+2) |

temperature	relative humidity	Time (hours, -0/+2)
±2℃	±5%	Ⅰ	Ⅱ	Ⅲ
110	85	96	192	408
120	85	48	96	192
130	85	24	48	96

Note: Vapor pressure at 110°C, 120°C, and 130°C shall be 0.12 MPa, 0.17 MPa, and 0.22 MPa, respectively.

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Table 2: Saturated Steam Temperature vs. Relative Humidity

(Dry temperature range: 100–123°C)

Saturation Temp(℃)	Relative Humidity(%RH)	100%	95%	90%	85%	80%	75%	70%	65%	60%	55%	50%
Dry Temp (℃)
100		100.0	98.6	97.1	95.5	93.9	92.1	90.3	88.4	86.3	84.1	81.7
101		101.0	99.6	98.1	96.5	94.8	93.1	91.2	89.3	87.2	85.0	82.6
102		102.0	100.6	99.0	97.5	95.8	94.0	92.2	90.2	88.1	85.9	83.5
103		103.0	101.5	100.0	98.4	96.8	95.0	93.1	92.1	89.0	86.8	84.3
104		104.0	102.5	101.0	99.4	97.7	95.9	94.1	92.1	90.0	87.7	85.2
105		105.0	103.5	102.0	100.4	98.7	96.9	95.0	93.0	90.9	88.6	86.1
106		106.0	104.5	103.0	101.3	99.6	97.8	96.0	93.9	91.8	89.5	87.0
107		107.0	105.5	103.9	102.3	100.6	98.8	96.9	94.9	92.7	90.4	87.9
108		108.0	106.5	104.9	103.3	101.6	99.8	97.8	95.8	93.6	91.3	88.8
109		109.0	107.5	105.9	104.3	102.5	100.7	98.8	96.7	94.5	92.2	89.7
110		110.0	108.5	106.9	105.2	103.5	101.7	99.7	97.7	95.5	93.1	90.6

(Additional columns for %RH and saturated temp. would follow as per original table.)

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Key Terms Clarified:

"Unpressurized saturated vapor": High-humidity environment without external pressure application.

"Steady-state": Constant conditions maintained throughout the test.

#Test Chamber #Temperature Sensor #Damp Heat Test Chamber #Temperature & Humidity Test Chamber #Single-container/Double-container Equipment #Accelerated Damp Heat Test

Precautions for Using an Oven in the Studio

2025-05-12

An oven is a device that uses electric heating elements to dry objects by heating them in a controlled environment. It is suitable for baking, drying, and heat treatment within a temperature range of 5°C to 300°C (or up to 200°C in some models) above room temperature, with a typical sensitivity of ±1°C. There are many models of ovens, but their basic structures are similar, generally consisting of three parts: the chamber, the heating system, and the automatic temperature control system.

The following are the key points and precautions for using an oven:

Ⅰ. Installation: The oven should be placed in a dry and level area indoors, away from vibrations and corrosive substances.

Ⅱ. Electrical Safety: Ensure safe electrical usage by installing a power switch with sufficient capacity according to the oven's power consumption. Use adequate power cables and ensure a proper grounding connection.

Ⅲ. Temperature Control: For ovens equipped with a mercury contact thermometer-type temperature controller, connect the two leads of the contact thermometer to the two terminals on the top of the oven. Insert a standard mercury thermometer into the vent valve (this thermometer is used to calibrate the contact thermometer and monitor the actual temperature inside the chamber). Open the vent hole and adjust the contact thermometer to the desired temperature, then tighten the screw on the cap to maintain a constant temperature. Be careful not to rotate the indicator beyond the scale during adjustment.

Ⅳ. Preparation and Operation: After all preparations are complete, place the samples inside the oven, connect the power supply, and turn it on. The red indicator light will illuminate, indicating that the chamber is heating up. When the temperature reaches the set point, the red light will turn off and the green light will turn on, indicating that the oven has entered the constant temperature phase. However, it is still necessary to monitor the oven to prevent temperature control failure.

Ⅴ. Sample Placement: When placing samples, ensure they are not too densely packed. Do not place samples on the heat dissipation plate, as this may obstruct the upward flow of hot air. Avoid baking flammable, explosive, volatile, or corrosive substances.

Ⅵ. Observation: To observe the samples inside the chamber, open the outer door and look through the glass door. However, minimize the frequency of opening the door to avoid affecting the constant temperature. Especially when working at temperatures above 200°C, opening the door may cause the glass to crack due to sudden cooling.

Ⅶ. Ventilation: For ovens with a fan, ensure the fan is turned on during both the heating and constant temperature phases. Failure to do so may result in uneven temperature distribution within the chamber and damage to the heating elements.

Ⅷ. Shutdown: After use, promptly turn off the power supply to ensure safety.

Ⅸ. Cleanliness: Keep the interior and exterior of the oven clean.

Ⅹ. Temperature Limit: Do not exceed the maximum operating temperature of the oven.

XI. Safety Measures: Use specialized tools to handle samples to prevent burns.

Additional Notes:

1.Regular Maintenance: Periodically inspect the oven's heating elements, temperature sensors, and control systems to ensure they are functioning correctly.

2.Calibration: Regularly calibrate the temperature control system to maintain accuracy.

3.Ventilation: Ensure the studio has adequate ventilation to prevent the buildup of heat and fumes.

4.Emergency Procedures: Familiarize yourself with emergency shutdown procedures and keep a fire extinguisher nearby in case of accidents.

By adhering to these guidelines, you can ensure the safe and effective use of an oven in your studio.

#Laboratory Precision Drying Oven #Industrial High-Temperature Heating Oven #Electric Temperature Controlled Oven #Digital Forced Convection Oven #Vacuum Laboratory Drying Oven #Programmable Hot Air Circulation Oven

QUV UV Accelerated Weathering Tester and Its Applications in the Textile Industry

2025-05-12

The QUV UV accelerated weathering tester is widely used in the textile field, primarily for evaluating the weather resistance of textile materials under specific conditions.

I. Working Principle

The QUV UV accelerated weathering tester assesses the weather resistance of textile materials by simulating ultraviolet (UV) radiation from sunlight and other environmental conditions. The device utilizes specialized fluorescent UV lamps to replicate the UV spectrum of sunlight, generating high-intensity UV radiation to accelerate material aging. Additionally, the tester controls environmental parameters such as temperature and humidity to comprehensively simulate real-world conditions affecting the material.

II. Applicable Standards

In the textile industry, the QUV tester complies with standards such as GB/T 30669, among others. These standards are typically used to evaluate the weather resistance of textile materials under specific conditions, including colorfastness, tensile strength, elongation at break, and other key performance indicators. By simulating UV exposure and other environmental factors encountered in real-world applications, the QUV tester provides reliable data to support product development and quality control.

III. Testing Process

During testing, textile samples are placed inside the QUV tester and exposed to high-intensity UV radiation. Depending on the standard requirements, additional environmental conditions such as temperature and humidity may be controlled. After a specified exposure period, the samples undergo a series of performance tests to assess their weather resistance.

IV. Key Features

Realistic Simulation: The QUV tester accurately replicates short-wave UV radiation, effectively reproducing physical damage caused by sunlight, including fading, loss of gloss, chalking, cracking, blistering, embrittlement, strength reduction, and oxidation.

Precise Control: The device ensures accurate regulation of temperature, humidity, and other environmental factors, enhancing testing precision and reliability.

User-Friendly Operation: Designed for easy installation and maintenance, the QUV tester features an intuitive interface with multi-language programming support.

Cost-Effective: The use of long-life, low-cost fluorescent UV lamps and tap water for condensation significantly reduces operational expenses.

V. Advantages in Application

Rapid Evaluation: The QUV tester can simulate months or even years of outdoor exposure in a short time, enabling quick assessment of textile durability.

Enhanced Product Quality: By replicating real-world UV and environmental conditions, the tester provides reliable data to optimize product design, improve quality, and extend service life.

Broad Applicability: In addition to textiles, the QUV tester is widely used in coatings, inks, plastics, electronics, and other industries.

VI. Our Expertise

As one of China's earliest manufacturers of UV weathering test chambers, our company possesses extensive experience and a mature production line, offering highly competitive pricing in the market.

Conclusion

The QUV UV accelerated weathering tester holds significant value and broad application prospects in the textile industry. By simulating real-world UV exposure and environmental factors, it provides manufacturers with dependable data to refine product design, enhance quality, and prolong product lifespan.

#Environmental Test Chamber #UV weathering test chamber #UV aging test chamber #Q8 UV test chamber #UV exposure test chamber #Material durability test equipment

Summary for LED Testing Conditions

2025-05-12

What is LED?

A Light Emitting Diode (LED) is a special type of diode that emits monochromatic, discontinuous light when a forward voltage is applied—a phenomenon known as electroluminescence. By altering the chemical composition of the semiconductor material, LEDs can produce near-ultraviolet, visible, or infrared light. Initially, LEDs were primarily used as indicator lights and display panels. However, with the advent of white LEDs, they are now also employed in lighting applications. Recognized as the new light source of the 21st century, LEDs offer unparalleled advantages such as high efficiency, long lifespan, and durability compared to traditional light sources.

Classification by Brightness:

Standard Brightness LEDs (made from materials like GaP, GaAsP)
High-Brightness LEDs (made from AlGaAs)
Ultra-High-Brightness LEDs (made from other advanced materials)
☆ Infrared Diodes (IREDs): Emit invisible infrared light and serve different applications.

LED Reliability Testing Overview:

LEDs were first developed in the 1960s and were initially used in traffic signals and consumer products. It is only in recent years that they have been adopted for lighting and as alternative light sources.

Additional Notes on LED Lifespan:

The lower the LED junction temperature, the longer its lifespan, and vice versa.

LED lifespan under high temperatures:

10,000 hours at 74°C
25,000 hours at 63°C
As an industrial product, LED light sources are required to have a lifespan of 35,000 hours (guaranteed usage time).
Traditional light bulbs typically have a lifespan of around 1,000 hours.
LED streetlights are expected to last over 50,000 hours.

LED Testing Conditions Summary:
Temperature Shock Test
Shock Temp. 1	Room Temp	Shock Temp. 2	Recovery Time	Cycles	Shock Method	Remarks
-20℃(5 min)	2	90℃(5 min)		2	Gas Shock
-30℃(5 min)	5	105℃(5 min)		10	Gas Shock
-30℃(30 min)		105℃(30 min)		10	Gas Shock
88℃(20 min)		-44℃(20 min)		10	Gas Shock
100℃(30 min)		-40℃(30 min)		30	Gas Shock
100℃(15 min)		-40℃(15 min)	5	300	Gas Shock	HB-LEDs
100℃(5 min)		-10℃(5 min)		300	Liquid Shock	HB-LEDs

LED High-Temperature High-Humidity Test (THB Test)
Temperature/Humidity	Time	Remarks
40℃/95%R.H.	96 Hour
60℃/85%R.H.	500 Hour	LED Lifespan Testing
60℃/90%R.H.	1000 Hour	LED Lifespan Testing
60℃/95%R.H.	500 Hour	LED Lifespan Testing
85℃/85%R.H.	50 Hour
85℃/85%R.H.	1000 Hour	LED Lifespan Testing

Room Temperature Lifespan Test
27℃	1000 Hour	Continuous illumination at constant current

High-Temperature Operating Life Test (HTOL Test)
85℃	1000 Hour	Continuous illumination at constant current
100℃	1000 Hour	Continuous illumination at constant current

Low-Temperature Operating Life Test (LTOL Test)
-40℃	1000 Hour	Continuous illumination at constant current
-45℃	1000 Hour	Continuous illumination at constant current

Solderability Test
Test Condition	Remarks
The pins of the LED (1.6 mm away from the bottom of the colloid) are immersed in a tin bath at 260 °C for 5 seconds.
The pins of the LED (1.6 mm away from the bottom of the colloid) are immersed in a tin bath at 260+5 °C for 6 seconds.
The pins of the LED (1.6 mm away from the bottom of the colloid) are immersed in a tin bath at 300 °C for 3 seconds.

Reflow soldering oven test
240℃	10 seconds

Environmental test (Conduct TTW solder treatment for 10 seconds at a temperature of 240 °C ± 5 °C)
Test Name	Reference Standard	Refer to the content of the test conditions in JIS C 7021	Recovery	Cycle Number (H)
Temperature Cycling	Automotive Specification	-40 °C ←→ 100 °C, with a dwell time of 15 minutes	5 minutes	5/50/100
Temperature Cycling		60 °C/95% R.H, with current applied		50/100
Humidity Reverse Bias	MIL-STD-883 Method	60 °C/95% R.H, 5V RB		50/100

#Climate Test Chamber #Thermal Shock Chamber #Temperature and Humidity test for LED #Rapid Thermal Cycling Chamber #Simulation Chamber #Aging Test Chamber

User Guide for Environmental Test Equipment

2025-05-12

1. Basic Concepts

Environmental test equipment (often referred to as "climate test chambers") simulates various temperature and humidity conditions for testing purposes.

With the rapid growth of emerging industries such as artificial intelligence, new energy, and semiconductors, rigorous environmental testing has become essential for product development and validation. However, users often face challenges when selecting equipment due to a lack of specialized knowledge.

The following will introduce the basic parameters of the environmental test chamber, so as to help you make a better choice of products.

2. Key Technical Specifications

(1) Temperature-Related Parameters

1. Temperature Range

Definition: The extreme temperature range in which the equipment can operate stably over long periods.

High-temperature range:

Standard high-temperature chambers: 200℃, 300℃, 400℃, etc.
High-low temperature chambers: High-quality models can reach 150–180℃.
Practical recommendation: 130℃ is sufficient for most applications.

Low-temperature range:

Single-stage refrigeration: Around -40℃.
Cascade refrigeration: Around -70℃.
Budget-friendly options: -20℃ or 0℃.

2. Temperature Fluctuation

Definition: The variation in temperature at any point within the working zone after stabilization.

Standard requirement: ≤1℃ or ±0.5℃.

Note: Excessive fluctuation can negatively impact other temperature performance metrics.

3. Temperature Uniformity

Definition: The maximum temperature difference between any two points in the working zone.

Standard requirement: ≤2℃.

Note: Maintaining this precision becomes difficult at high temperatures (>200℃).

4. Temperature Deviation

Definition: The average temperature difference between the center of the working zone and other points.

Standard requirement: ±2℃ (or ±2% at high temperatures).

5. Temperature Change Rate

Purchasing advice:

Clearly define actual testing requirements.
Provide detailed sample information (dimensions, weight, material, etc.).
Request performance data under loaded conditions.(How many produce you going to test once?)
Avoid relying solely on catalog specifications.

(2) Humidity-Related Parameters

1. Humidity Range

Key feature: A dual parameter dependent on temperature.

Recommendation: Focus on whether the required humidity level can be maintained stably.

2. Humidity Deviation

Definition: The uniformity of humidity distribution within the working zone.

Standard requirement: ±3%RH (±5%RH in low-humidity zones).

(3) Other Parameters

1. Airflow Speed

Generally not a critical factor unless specified by testing standards.

2. Noise Level

Standard values:

Humidity chambers: ≤75 dB.
Temperature chambers: ≤80 dB.

Office environment recommendations:

Small equipment: ≤70 dB.
Large equipment: ≤73 dB.

3. Purchasing Recommendations

Select parameters based on actual needs—avoid over-specifying.
Prioritize long-term stability in performance.
Request loaded test data from suppliers.
Verify the true effective dimensions of the working zone.
Specify special usage conditions in advance (e.g., office environments).

#Climate Test Chamber #Environmental Test Chamber) #Reliability Testing #Testing Cost Optimization #Balance technical terms with buyer intent keywords #emerging industry applications

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