1/SSPC-SP 5. White Metal Blast Cleaning. This NACE International (NACE)/ SSPC: The Society for Protective Coatings standard represents a consensus of. Requirements for “White Metal” – one of five levels of cleanliness of steel surfaces achieved by blast cleaning with the use of abrasives. (White Metal, Near-White. SSPC-SP5. A Sa 3, B Sa 3, C Sa 3 and D Sa 3. SSPC-SP A Sa 2½, B Sa 2½, C Sa 2½ and D Sa 2½. SSPC-SP6. B Sa2, C Sa 2 and D Sa 2. SSPC-SP7.
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The coating specification also might call for chloride testing to ensure deposited soluble salts are not higher the permissible limit. If the recently blasted surface is exposed to salts, moisture, contamination or a corrosive environment, rust can occur easily.
Please subscribe to my monthly newsletter so you don’t miss a thing. Therefore, it is often better than other blast cleaning as it requires higher standards of a clean surface. I understand that you will use my information to send me a newsletter. The air compressor also should be checked for oil and water contamination by Blotter Test. White metal blast cleaning is also used when immersion service requires the highest level of cleaning.
Substrate temperature should not be colder surrounding air temperature; otherwise, the moisture can condensate on the cleaned-blast surface and cause flash rust.
Most coating specification requires a surface profile measurement by Press-O-Film replica test or commercial name as testex tape test.
NACE No. 1-SSPC-SP 5, White Metal Blast Cleaning_百度文库
Some coating specification requires a surface dust test being performed. Besides, all conditions mentioned in the coating specification documents must be met.
As with all standards, it is very important to take the necessary precautions when working with blast cleaning. Please note random staining, light shadows, discoloration are not allowed to remain on the surface. Also, prior to continuing with the coating, be sure to remove any sapc rust that forms on the steel surface after blast cleaning.
The abrasives selected for this method depend on a variety of factors. Therefore, always be certain to remove visible rust prior to continuing with the new coating system. Dp5 surfaces may lead to premature paint failure.
The dew point is the temperature that condensation starts. The procurement documents are part of the contract and have established requirements that must be met per project.
SSPC-SP 5 White Metal Blast Cleaning (NACE No. 1)
The abrasive used for White metal blast cleaning should be dry and free of any contaminants, such as oil, grease, etc. As mentioned prior, after blast cleaning, be sure to meet all surface standards as presented in the coating specification documents. Abrasives are used for grinding, polishing, or cleaning hard surfaces.
This can be achieved with the use of brushing, blowing off residue with clean, dry air, and vacuum cleaning. Therefore, fewer imperfections are acceptable with white metal blast cleaning.
The amount of surface profile depends on coating specificationbut most of the specifications requires 2 thru 3 mils. We will be updating and growing this site with more and ssspc of industrial inspection related articles.
SSPC-SP 5 White Metal Blast Cleaning ( NACE No. 1)
White metal blast cleaning is to be used to clean unpainted or painted steel surfaces prior to applying high-performance protective coating or lining systems. Once the methods above have been applied, be sure to remove all visible residues from the surface. In order to be able to apply white metal blast cleaning be sure that all visible oil, grease, and other contaminant residues are removed. The sandblasting process should not be done if the surface temperature is less than 5-degree Fahrenheit or 3-degree Celsius above the dew point.
I am at least 16 years of age.