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, Sa3, which are internationally common standards. 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 that of the untreated workpieces. Technical standards for Sa1 level treatment: The surface of the workpiece should be free from 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 is the lowest level of 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 33%, which can include slight shadows; a small amount of slight discoloration caused by defects and corrosion; 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 industry and can be used as acceptance technical requirements and standards.