High and Low Temperature Humidity Test

Significance of high and low temperature test

Whether it is outdoor or indoor, the product will inevitably encounter high temperature environment (above 50), low temperature environment (below 10), high humidity environment (relative humidity above 80), dry environment (low relative humidity) due to various problems At 40).

High temperature is usually direct sunlight, or there is a strong heat source in the use environment. Low temperature environment is common in subtropical areas without heating in winter (all friends in the south understand) or there is a strong cold source in the environment. The high humidity environment is usually a swamp climate, marine climate, or monsoon climate in spring, etc., or there is a strong source of water vapor in the environment. The dry environment is common in the continental climate, desert climate, or monsoon climate in autumn.

In addition, some products may often oscillate back and forth between high and low temperatures during use, such as transportation vehicles used in cold storage.

Detailed introduction of high and low temperature test

In the natural environment, temperature and humidity are two inseparable natural factors. Different regions have different temperature and humidity effects due to different geographic locations. This test is used to confirm the product's adaptability to storage, transportation and use under the conditions of temperature, humidity and climate. The severity of the test depends on the high / low temperature, humidity, and duration of exposure.

High temperature test details: This test is used to determine the product's adaptability to storage, transportation, and use under high temperature climate conditions. The severity of the test depends on the temperature of the high temperature and the duration of exposure. Reference test standards: GB / T 2423.2, IEC 60068-2-2, IEIA 364, MIL-STD-810F, etc.

Introduction to low temperature test: This test is used to determine the adaptability of products to be stored, transported and used under low temperature climatic conditions. The severity of the test depends on the low temperature and the duration of exposure. Reference test standards: GB / T 2423.1, IEC 60068-2-1, EIA 364, MIL-STD-810F, etc.

Introduction to temperature shock test: This test is to determine the adaptability of the product to storage, transportation and use in a climate with a sharp temperature change. The severity of the test depends on the high / low temperature, residence time, and number of cycles. Reference test standards: IEC60068-2-14, GB2423.22, GJB150.5, etc.

Factors affecting the experimental results

1. The influence of high and low temperature range, the higher the high temperature, the lower the low temperature, the shorter the impact test interval, the worse the result.

2. The effect of expansion / contraction space reserved for expansion joints and gaps in the product. If the reserved space is not reasonable, the result will be poor.

3. Difference in material expansion coefficient. The greater the difference in expansion coefficient, the worse the result. Please try to choose materials with similar expansion coefficients.

4. The influence of high temperature aging / low temperature embrittlement of polymer materials. Under high temperature, it will accelerate the cracking of polymers. The low temperature environment will cause the embrittlement of polymer materials.

5. The influence of metal materials. At high temperatures, the rate of metal oxidation will increase, especially in high humidity environments. In a low temperature environment, many metal materials, such as iron, become brittle.

6. Under the impact environment, repeated expansion and contraction cause the internal defects of the material to enlarge. This is often referred to as material fatigue.

High and low temperature test, welcome to consult LIB for suppling environmental test chambers.