The purpose of low temperature test is to test whether the test piece can be stored, manipulated and controlled in a long-term low-temperature environment, and to determine the adaptability and durability of military and civil equipment under low-temperature conditions. Physical and chemical properties of materials at low temperature. The standard has specification requirements for pre-test treatment, initial test, sample installation, intermediate test, post-test treatment, heating rate, load condition of temperature cabinet, volume ratio of measured object to temperature cabinet, etc.
Failure mode of test piece under low temperature: the parts and materials used in the product may crack, embrittlement, jamming of movable part, characteristic change and so on at low temperature.
Effect of low temperature
1. Make the material hard and brittle;
2. With the increase of lubricant viscosity, the flow capacity decreases and the lubrication effect decreases;
3. The performance of electronic components changes;
4. Water condensation and freezing;
5. Seal failure;
6. Material shrinkage causes changes in mechanical structure.
Scope of application
Low temperature test is mainly used for scientific research, preservation of medical supplies, low temperature test and storage of biological products, ocean products, electronic components, chemical materials and other special materials.
Method standard
GB / t2423.1-2008 environmental testing of electric and electronic products Part 2: Test methods test a: low temperature
IEC 60068-2-1:2007 environmental testing of electric and electronic products Part 2: Test methods test a: low temperature
