Pressure sand blasting machine briefly describes the blast cleaning level, that is, cleanliness. There are two representative international standards: one is the "SSPC-" formulated by the United States in 1985; the second is the "Sa-" formulated by Sweden in 1976, It is divided into four levels: Sa1, Sa2, Sa2.5, and Sa3, which are internationally common standards. The details are as follows: Sa1 level-equivalent to the US SSPC-SP7 level. Generally simple manual brushing and abrasive cloth polishing methods are used. These are the four levels with the lowest degree of cleanliness, and the protection of the coating is only slightly better than the untreated workpiece. Technical standards for Sa1 level treatment: The surface of the workpiece should be free of dirt such as oil, grease, residual oxide scale, rust spots, and residual paint. Sa1 level is also called manual cleaning and cleaning level. (Or cleaning level)
Sa2 level-equivalent to the US SSPC-SP6 level. Sandblasting method is adopted, which is the lowest level in sandblasting, which is a general requirement, but the protection of the coating is much higher than manual cleaning. Technical standard for Sa2 level treatment: The surface of the workpiece should be free of oil, dirt, scale, rust, paint, oxides, corrosives, and other foreign materials (except defects), but the defects are limited to not more than per square meter of surface. 33%, which can include slight shadows; a small amount of slight discoloration caused by defects and rust; oxide scale and paint defects. If the original surface has dents, slight rust and paint will remain on the bottom of the dents. Sa2 level is also called commodity cleaning level (or industrial level). Sa2.5 level-is the level generally used in the industry and can be used as acceptance technical requirements and standards.