Currently, the environment-friendly paints and poor-quality paints in the building materials market are coexisting. It is best to purchase the “three-step method†to identify the environmental protection paints in the brand stores: First, the environmentally friendly paints are prepared using imported raw materials. The bright paints are white in color and crystal clear; The matt paint is translucent, slightly turbid, without redness, blackening, and sedimentation. Second, under normal circumstances, the environment-friendly paint has a mild, elegant and fragrant aroma. The poor quality of the paint opens up a pot of paint and emits a strong sensation. The pungent odor or other unknown odor of the current part of the inferior paint is also scent, but as bad as the perfume, the third is to buy when you should carefully ask the paint price, environmental safety, quality commitment, service commitment, etc. Check the corresponding new national standard inspection report, benzene-free certificate and ISO9001 certificate. Environmental-friendly paints are all equipped with national standard inspection reports and corresponding certificates.
Centrifuge Test Tube
The advantage of the plastic centrifuge tube is that it is transparent or translucent, its hardness is small, and the gradient can be taken out by the puncture method. The disadvantage is that it is easy to deform, has poor corrosion resistance to organic solvents, and has a short service life.
Plastic Centrifuge Tubes have caps, which are used to prevent sample leakage, especially when used for radioactive or highly corrosive samples. It is very important to prevent sample leakage; the tube cap also has a function to prevent sample volatilization. And support the centrifuge tube to prevent deformation of the centrifuge tube. When choosing this point, you should also pay attention to check whether the tube cover is tight, and whether it can be tightly covered during the test, so as to achieve the inversion without leakage;
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