The thermal shock chamber can be used to detect the relevant parameters of materials in the continuous environment of instantaneous extremely high temperature and extremely low temperature. The equipment has been used in the detection of electronic equipment, plastics, metals and other materials. Some changes caused by thermal expansion and contraction of the specimen are detected in a short period of time, so some materials cannot be detected. Which materials cannot be detected by the thermal shock chamber?
Since explosive substances can easily cause explosion effects, do not use this kind of thermal shock chamber equipment for testing. Common explosive substances are explosive nitrates (for example: nitroglycerin, nitroglycerin, nitrocellulose, etc.), nitro compounds (trinitrotoluene, trinitrobenzene, trinitrophenol, etc.).
It also cannot be used to detect flammable substances. According to the different ignition points, there are the following five categories:
① Flammable substances with ignition point above 30℃: coal, gasoline, turpentine, isoamyl alcohol, acid vinegar.
② Flammable substances with ignition point above 0℃: alcohol, dimethyl ether, isoamyl acid, etc.
③ Flammable substances whose ignition point is above -30℃ but less than 0℃: general ethane, ethylene, acetone, benzene, methyl ketone, etc.
④ Combustibles with ignition point below -30℃: ethanol, gasoline, acetaldehyde, propylene, carbon disulfide, etc.
⑤ Flammable gas: When the temperature is 15 ℃, it may burn under 1 atmosphere. For example, hydrogen, acetylene, ethylene, methane, ethane, propane, butane and the like.
Although it is not a flammable substance, it may cause safety hazards due to the rapid temperature change of the equipment. These flammable substances include: lithium, potassium, sodium, yellow phosphorus, phosphorus sulfide, phosphide lime, red phosphorus, aluminum powder, calcium carbide, Magnesium powder, sodium bisulfite, etc.
Chlorate (potassium chlorate, sodium chlorate, ammonium chlorate, etc.), hypochlorite (potassium nitrate, sodium ammonium peroxide, etc.), inorganic peroxides (potassium peroxide, sodium peroxide, barium peroxide, etc.).
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