I. Observation
Generally, the front of latex paint will be marked with name, trademark, net content, composition, usage and precautions. Pay attention to the production date and shelf life, and try to buy the latest products. At present, general brand latex paints have environmental protection test reports or test sheets, and the test results of VOC, free formaldehyde and heavy metals have standards. The national standard VOC shall not exceed 200g per liter, and the free formaldehyde shall not exceed 0. 1g per kilogram.
Second, components
The qualified quality of latex paint is about 7 kg in a barrel of 5 liters, and about 25 kg in a barrel of 18 liters. There is also a simple way to lift the paint bucket. Regular brand latex paint can't hear the sound when it is shaken, and it is easy to shake the sound, which proves that the viscosity of latex paint is insufficient.
Third, do it.
High-quality latex paint is a viscous, milky liquid, without caking, even after mixing, and without odor (if it has fragrance, it is not recommended to use it, which is likely to be a means to cover up the odor), otherwise the latex paint has quality problems. You can also apply it evenly on your fingers and dry the conjunctiva in a few minutes. If the conjunctiva has certain extensibility, it can be used with confidence.