Laboratory capacity introduction

Climate environmental test

Mainly including high temperature test, low temperature test, rapid temperature change test, temperature shock test, constant temperature and humidity test, temperature and humidity combined cycle test, alternating damp heat test, salt spray test, waterproof and dustproof test, ultraviolet aging test and xenon lamp aging test, etc. . It is an assessment of the adaptability of products under various environmental conditions and is one of the important test methods for evaluating product reliability.

(1) High temperature test

Test Purpose: To assess the suitability of test samples for storage or use under high temperature conditions. It is applied to electronic and electrical products, auto parts, and packaging boxes that are stored or operated in high-temperature environments such as tropical weather or steel mills.

Test equipment: multiple constant temperature and humidity test chambers of different sizes and walk-in constant temperature and humidity test chambers and different sizes of ventilation air ovens

Test conditions: depending on the temperature of the high temperature and the duration of exposure.

 Preferred temperature: 200 ° C, 175 ° C, 155 ° C, 125 ° C, 100 ° C, 85 ° C, 70 ° C, 55 ° C, etc.;

 Preferred test times are: 2h, 16h, 72h, 96h, etc.

Test reference standards: GB/T 2423.2; IEC 60068-2-2; EIA364; MIL-STD-810F.

Equipment parameters: maximum temperature can be 300 ° C, temperature deviation ± 1 ° C

(2) Low temperature test

Test Purpose: To assess the suitability of test samples for storage or use under low temperature conditions.

Test equipment: multiple constant temperature and humidity test chambers of different sizes and walk-in constant temperature and humidity test chambers

Test conditions: depending on the temperature of the low temperature and the duration of exposure.

 Preferred temperatures are: - 65 ° C, -55 ° C, -40 ° C, -25 ° C, -10 ° C, -5 ° C, + 5 ° C, etc.;

 Preferred test times are: 2h, 16h, 72h, 96h, etc.

Test reference standards: GB/T 2423.1; IEC 60068-2-1; EIA364; MIL-STD-810F.

Equipment parameters: the lowest temperature can be -70 ° C, temperature deviation ± 1 ° C

(3) Rapid temperature change test

Test Purpose: Rapid temperature change is a temperature change that specifies the rate of temperature change. It is often used to simulate the environment with large temperature difference between day and night. It can also be used for life test to assess the appearance, mechanical and electrical properties of components or products.

Test equipment: rapid temperature change test chamber

Test conditions:

1) The high temperature and low temperature values of the temperature variation range;

2) The holding time of the test sample at high temperature and low temperature;

3) temperature change from low temperature to high temperature or high temperature to low temperature;

4) The number of conditional test cycles.

Test reference standards: GB/T 2423.34; IEC 60068-2-38; GJB 150.5 and so on.

Equipment parameters: test temperature range -70 ° C ~ 150 ° C, test humidity range 20% ~ 98%

(4) Temperature shock test

Test purpose: It is used to assess the adaptability of products in storage, transportation and use under the climatic conditions of rapid temperature changes. The purpose of the thermal shock test is basically the same as that of the temperature cycle test, but the conditions of the thermal shock test are much more severe than the temperature cycle test.

Test equipment: two-box thermal shock test chamber, three-box thermal shock test chamber

Test conditions:

1) The high temperature and low temperature values of the temperature variation range;

2) The holding time of the test sample at high temperature and low temperature;

3) switching time from low temperature to high temperature or high temperature to low temperature;

4) The number of conditional test cycles.

Test reference standards: GB/T 2423.22; IEC 60068-2-14; GJB 150.5 and so on.

Equipment parameters: test temperature range -70 ° C ~ 150 ° C, temperature change rate ≤ 5 min.

(5) Constant temperature and humidity test

Test purpose: In the natural environment, temperature and humidity are two inseparable natural factors, and different regions have different temperature and humidity effects due to different geographical locations. For example, winter in northern China is a low-temperature and low-humidity environment, while summer in the south is a high-temperature and high-humidity environment. This test is used to confirm the adaptability of the product under storage, transportation and use under temperature and humidity climatic conditions. Observe the influence of the test sample under constant temperature, no condensation, high humidity environment at specified time, and evaluate the resistance of the test sample in an accelerated manner. The effect of wet heat degradation.

Test equipment: constant temperature and humidity chamber

Test conditions: test temperature; test humidity; exposure duration.

 Preferred temperature/humidity is: 40°C, 85%; 40°C, 93%; 85°C, 85%, etc.

 Preferred test time is: 48h, 96h, etc.

Test reference standards: GB/T 2423.3; IEC 60068-2-78; EIA 364; MIL-STD-810F.

Equipment parameters: test temperature range -70 ° C ~ 150 ° C, test humidity range 20% ~ 98%

(6) Temperature and humidity combined cycle test

Test Purpose: It is suitable for determining the adaptability of the test sample to use and storage under the conditions of temperature cycle change and surface condensation.

Test equipment: high and low temperature (wet heat) test chamber

Test conditions: selected temperature, humidity, number of cycles, temperature change rate, duration.

Test reference standards: GB/T 2423.34; IEC 60068-2-38; EIA 364; MIL-STD-810F.

Equipment parameters: test temperature range -70 ° C ~ 150 ° C, test humidity range 20% ~ 98%.

(7) Alternating damp heat test

Test Purpose: High and low temperature alternating heat and humidity test is an essential test item in aviation, automobile, home appliance, scientific research, etc., used to test and determine electrical, electronic and other products and materials for high temperature, low temperature, alternating heat and humidity or constant test. Parameters and performance after temperature changes.

Test equipment: high and low temperature (wet heat) test chamber

Test conditions: selected temperature, humidity, number of cycles, temperature change rate, duration.

Test reference standards: GB/T 2423.4; IEC 60068-2-30; EIA 364; MIL-STD-810F.

Equipment parameters: test temperature range -70 ° C ~ 150 ° C, test humidity range 20% ~ 98%.

(8) Salt spray test

Test Purpose: The salt spray test is an environmental test that uses the artificial simulated salt spray environmental conditions created by the salt spray test equipment to confirm the corrosion resistance of the product or metal material.

Laboratory simulated salt spray can be divided into three categories: neutral salt spray test, acetate spray test, copper salt accelerated acetate spray test.

 Neutral salt spray test (NSS test) is one of the earliest applications in the field of accelerated corrosion test. It uses a 5% aqueous solution of sodium chloride solution, and the pH of the solution is adjusted to a neutral range (6.5 to 7.2) as a solution for spraying. The test temperature is taken at 35 ° C, and the sedimentation rate of the salt spray is required to be 1 to 2 ml / 80 cm 2 / h.

醋酸 The acetate spray test (ASS test) was developed on the basis of a neutral salt spray test. It is to add some glacial acetic acid to the 5% sodium chloride solution, the pH value of the solution is reduced to about 3, the solution becomes acidic, and the salt mist formed finally changes from neutral salt spray to acidity. Its corrosion rate is about 3 times faster than the NSS test.

 Copper salt accelerated acetate spray test (CASS test) is a rapid salt spray corrosion test developed recently in foreign countries. The test temperature is 50 ° C, and a small amount of copper salt-copper chloride is added to the salt solution to strongly induce corrosion. Its corrosion rate is about 8 times that of the NSS test.

Test equipment: salt spray test chamber

Test conditions: depending on the type of test and duration of exposure.

Test reference standards: GB/T 2423.17; IEC 60068-2-11; ISO 4628.3; ISO 10125; ASTM B117; JIS-Z2371; JIS-G3141; GJB 150.1; MIL-STD-883E; MIL-STD-810F.

(9) Waterproof test

Test purpose: mainly for electronic products and equipment that are used outdoors or in harsh environments, the representation is IPXX, the first characteristic number indicates the degree of protection against the danger of accessing dangerous parts and preventing the entry of solid foreign objects, the second characteristic number is represented by The degree of protection against water ingress. It is used to evaluate whether the equipment or components can work well after the test of the product casing and seals.

Test conditions: IPX1-9

Test equipment: IP waterproof test device, IPX9K high temperature and high pressure waterproof test machine

Test reference standards: DIN 40050-9; GB/T 4208; GB/T 30038; IEC 60529; ISO 20653, etc.

(10) Dust test

Test Purpose: It is used to test the shell sealing performance of the product, including the first feature number is 1 to 6, that is, the protection grade code is IP1X to IP6X. The IP5X and IP6X two-level tests specified in the enclosure protection level standard mainly simulate the dust environment encountered during the use, transportation and storage of the product, thereby verifying the protective performance of the outer casing.

Test equipment: IP dust (dust) test box

Test conditions: IP1X-6X

Test reference standards: DIN 40050-9; GB/T 4208; GB/T 30038; IEC 60529; ISO 20653, etc.

(11) UV aging test

Test Purpose: To simulate and enhance the most significant UV spectrum for material aging. Material aging includes fading, loss of light, reduced strength, cracking, flaking, chalking, and oxidation.

Test equipment: UV weathering test chamber

Test reference standards: SAE J 2020; GB/T 31881; ASTM D4329; ASTM G154; GB/T 16422.3; ISO 4892-3; GB/T 14522 and the like.

(12) Xenon lamp aging test

Test Purpose: To reproduce destructive light waves in different environments, including visible light, ultraviolet light and infrared light, with a xenon arc lamp simulating full sunlight spectrum, which can provide corresponding environmental simulation and accelerated tests for scientific research, product development and quality control.

Test equipment: air-cooled xenon weathering test chamber, water-cooled xenon lamp weathering test chamber

Test reference standards: SAE J 2412; SAE J 2527; GB/T 16991; GB/T 8430; QB/T 2727; GB/T 32088; ASTM G155; ASTM G147; ISO 4892-2; GB/T 16422.2.

(13) Ozone aging test

Test purpose: Mainly apply automotive rubber products, simulate and strengthen the ozone conditions in the atmosphere, and confirm the product's ability to resist ozone cracking when exposed to air containing a certain concentration of ozone and at a specified temperature without direct influence of light.

Test equipment: ozone aging test chamber

Test standard: QC/T 17; GB/T 7762; ISO 1431-1, etc.

(14) High temperature illumination test

Test purpose: Infrared irradiation of the product under certain ambient temperature conditions, simulating the ability of the product to resist high temperature illumination environment.

Test equipment: light temperature control system + step-in temperature and humidity test chamber

Test standard: mainly based on the requirements of the vehicle test program.

Mechanical environment test

The mechanical environment test is to create a variety of mechanical artificial environment for the product, to simulate the influence of the mechanical environment on the product, to assess the mechanical environment adaptability of the product and the structural integrity under the environmental conditions. It mainly includes mechanical vibration, mechanical shock, and drop test.

(1) Mechanical vibration

The vibration test mainly has sinusoidal vibration and random vibration. Simulate the various vibrational environmental effects encountered in the transportation, installation and use environment to determine whether the product can withstand various environmental vibrations.

Test equipment: vibration test bench

Test standards: GB/T 2423.10; IEC 60068-2-6; ISO 8318; GB/T 4857.10; GB/T 2423.56; ASTM D4728; GB/T 4857.23; ISTA 1A; ISTA 2A; ISTA 3A, and the like.

(2) Mechanical shock

Test Purpose: Many products are subject to impact during use, handling, and transportation. This test is used to determine the impact resistance of the product. According to the pulse waveform (the waveform generated from the time when the sample is subjected to the force to the end of the force), it can be divided into: a half sine pulse, a post-peak sawtooth pulse and a trapezoidal wave pulse.

Test equipment: mechanical impact test bench

Test conditions: Pulse waveform (half sinusoidal pulse), peak acceleration, pulse width, direction, and number of times are selected.

Test standards: GB/T 2423.5; IEC 60068-2-27; MIL-STD-202G; EIA-364-27.

(3) Drop test

Test Purpose: To simulate the impact of product drop caused by improper handling actions on the product.

Test equipment: drop test machine

Test conditions: free fall

Drop height: (unit: mm)

The direction of force of the sample: the point, line, and surface of the packaged sample, that is, the corner, edge, and surface of the package; or other directions of the sample.

Ground requirements: concrete floor or 2cm thick iron (steel) board or wooden floor.

The number of drops: one corner, three sides and six other or other related requirements.

Test standard: GB/T 2423.8; ISTA 1A; ISTA 2A; ISTA 3A; IEC 60068-2-32; GB/T 4857.5, etc.

Three comprehensive environmental tests

The three comprehensive environmental test is to apply a separate environmental stress on the product to trigger the failure of the product, so that three different environmental stresses can be applied to the product to easily obtain a 3 to 5 times acceleration effect. Environmental stress synthesis can also trigger failures that cannot occur when individual stresses are applied. Therefore, three comprehensive tests are often used to detect product defects early, thereby improving products and improving product reliability.

Test Purpose: A multi-factor integrated environment for simulating the storage, transportation, and use environment of electronic products. Commonly used comprehensive environmental tests include comprehensive tests for temperature and vibration, and comprehensive tests for temperature and humidity.

Test equipment: three comprehensive test chamber

Test conditions: temperature + humidity + vibration.

Test standards: GB/T 2423.102, BYD QBYDQ-A1901.707.3 and other car factory standards.

Auto parts fatigue and life test

Fatigue is the main form of damage to automotive components. In actual use, these components are often subjected to periodic alternating stresses until they are destroyed due to constant changes in load and speed. This is called fatigue damage and mileage during damage. Or the number of cycles is fatigue life.

Test purpose: Simulate the repeated stretching, compression, bending, torsion and bending of automobile parts in actual automobile use.

Main test items:

 pull-torsion composite fatigue test

 Automotive interior handle endurance test

开关 Endurance test of switch in automobile combination

 Automotive manual brake endurance test

按键 Button life test

储 Storage box endurance test

Test standard: mainly based on the test program requirements of each vehicle manufacturer.