Sa3 level
It is equivalent to the US SSPC-SP5 level, which is the highest processing level in the industry, also called the white cleaning level or white level. The technical standard requirement of Sa3 treatment is that the metal surface has no impurities, that is, when observed without magnification, there is no visible grease and dirt on the surface, and there is no oxide scale, rust, paint coating and foreign matter, and the surface should have a uniform metallic luster. Sa3 is the highest level of cleaning requirements, and the cost of cleaning is very high. It is only used in some occasions where special materials are used and particularly important engineering and parts painting construction, such as nuclear power plants, steam turbines, offshore platforms and other important parts and chemicals Cabins and chemical storage tanks. Workpieces that use inorganic zinc coatings and metal sprays often require surface cleaning to reach the most thorough cleaning level.
Generally speaking, the pre-painting surface treatment of heavy-duty anti-corrosion coating The surface treatment level of heavy-duty anti-corrosion coating primer before painting is usually the cleanliness level Sa2.5~Sa3.0.