The test heating / cooling rate of the high and low temperature impact test box is not less than 30 ℃ / minute. The temperature change range is very large, and the severity of the test also increases with the temperature change rate. The difference between the temperature shock test and the temperature cycle test is mainly the different stress loading mechanism. The temperature shock test mainly examines the failure due to creep and fatigue damage, while the temperature cycle mainly examines the failure due to shear fatigue. The temperature shock test allows the use of a two-slot test device; the temperature cycle test uses a single-slot test device. In the two-tank cabinet, the temperature change rate should be greater than 50 ° C / min. Causes of temperature shock: dramatic temperature changes in manufacturing and repair processes such as reflow soldering, drying, reprocessing, repairs, etc. Accelerated stress test: The accelerated test is an accelerated test performed on the test sample in a shorter time than in the actual environment to investigate its failure mechanism. The acceleration of the test is to use the method of increasing stress to promote the test sample to fail in a short time, but care must be taken to avoid the failure mechanism caused by other stress causes.
Nail polish remover is a product specially designed to remove nail polish. It belongs to the nail polish category and can remove nail polish effectively and quickly.
The specific components are some organic matter, is the relationship between solute and solvent, just like in high school chemistry, iodine can dissolve in alcohol, benzene, carbon tetrachloride is the same. It has a similar structure and is prone to phase dissolution. In fact, you can rub a coat of nail polish on top of the nail polish and wipe it off with a paper.
How to remove the nail correctly First of all, we must choose regular manufacturers, mild and non-stimulating nail polish remover, preferably without acetone. Secondly, the amount of nail polish remover must be small. Especially when nail polish remover contains acetone, it will make the surface of the nail cuticle due to dry and become rough and fragile. When cleaning nail polish, simply saturate the cotton pad with nail polish remover in an area the size of a nail nail. Third, nail polish remover should not be used to swipe your nails. Especially those who wash nail effect is more significant products, use it to wipe the nail surface, will make the nail surface become dim, dull. Instead, press a cotton pad dampened with nail polish remover against your nails for 10 seconds, then gently rub it down from top to bottom, and the polish is mostly gone. If not, you can do it again.
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