How To Identify Metal Surface Preparation Standards Grades?

How to identify metal Surface preparation standards grades?

The surface of metal anti-corrosion cleaning grade, also called cleanliness, has two representative international standards: one is the United States of 1985 "SSPC standards ",the other is Swedish "Sa standards " created in 1976, which divided into four grades: Sa1, Sa2, Sa2.5, Sa3,they are the usual general standards.

Sa 1 (SSPC-SP7)Light Blast Cleaning.

Using general simple manual brush, grinding with emery cloth.A method in which all oil, grease, dirt, rust scale, loose mill scale, loose rust and loose paint or coatings are removed completely. However all mill scale and rust must have been exposed to the abrasive blast pattern sufficiently to expose numerous flecks of the underlying metal fairly uniformly distributed over the entire surface.

Sa 2 (SSPC-SP6)Thorough Blast Cleaning.

sand blasting preparation, is the lowest grade in sandblasting processing.All oil, grease, dirt, rust scale and foreign matter are completely removed from the surface and all rust, mill scale and old paint are completely removed by abrasive blasting except for slight shadows, streaks or discolorations caused by rust stain, mill scale oxides or slight, tight resides of paint or coating that remain. If the surface is pitted, slight residue of rust or paint may be found in the bottom of pits; at least two-thirds of each square inch of surface area shall be free of all visible residues and the remainder shall be limited to the light residues mentioned above.

Sa2.5(Sa standards),Near White Blast cleaning.

It widely used in industry as the acceptance level of technical requirements and standards.In this method, all oil, grease, dirt, mill scale, rust, corrosion products, oxides, paint or other foreign matter have been completely removed from the surface by abrasive blasting, except for very light shadows, very slight streaks or slight discolorations caused by rust stain, mill scale oxides or slight, tight residues of paint or coating. At least 95% of each square inch of surface area shall be free of all visible residues, and the remainder shall be limited to the light discolorations mentioned above. From a practical standpoint, this is probably the best quality surface preparation that can be expected to today for existing plant facility maintenance work.

Sa 3(SSPC SP5)Blast Cleaning to Visually Clean Steel.

The highest grades of removal of surface preparation.all visible rust, mill scale, paint and contaminants, leaving the metal uniformly white or gray in appearance. This is the ultimate in blast cleaning. Use where maximum performance of protective coatings is necessary due to exceptionally severe conditions such as constant immersion in water or liquid chemicals.


sa2.5

WORLD-IRON STEEL stock the full range of steel pipe conforming to international standards.we also can provide customers with products based on their specified technical requirements.If we are helpful ,please mail to us :  info@worldironsteel.com.