What's Sandblasting level?
That is also called as cleanliness, there are two representative international standards: one is the United States formulated in 1985 "SSPC-"; The second is the "SA-" formulated by Sweden in 76 years, which is divided into four grades SA1, SA2, SA2.5, SA3, which is the international customary common standard, detailed as follows:
The SA1 level is the equivalent of the American sspcsp7 level. Using the general simple manual brush and abrasive polishing method, this is the first level of the four kinds of cleanliness, and the protection of the coating is only slightly better than the unprocessed workpiece. Technical standard of sa1 processing: the surface of the workpiece should not be seen as pollution, oil, residual oxidation, rust, and residual paint. The sa1 level is also called manual brush removal. (or cleaning level)
SA2 level -- equivalent to the American sspcsp6 level. This is the lowest level of Sandblasting, which is the minimum level, which is the general requirement, but the protection of the coating is much better than the manual brush. Technical standards for sa2 level processing: the surface of the workpiece should not be seen as greasy, dirt, rust, rust, paint, oxide, corrosion, and other foreign substances (except for the), but the defect is limited to 33%per square meter, which can include minor shading. A small number of defects caused by defects and rust; Scale and paint defects. If there is a dent in the surface of the workpiece, the slight rust and paint will remain in the bottom of the indentation. The sa2 level is also called the commodity cleaning level (or industrial level).
SA2.5 - is widely used in industry and can be used as the level of acceptance technical requirements and standards. The sa2.5 level is also called close white cleaning (near white or white). The technical standard of sa2.5 level: the same as sa2, but the defect is limited to 5%per square meter, including a slight shadow. A small number of defects caused by defects and rust; Scale and paint defects.
The SA3 level, the equivalent of the American sspcsp5, is the highest level in industry, also known as white cleaning (or white). The technical standards of sa3 level: like the sa2.5 level, 5% of the shadow, defect, and rust are not available.
