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. 1/SSPC-SP 5. White Metal Blast Cleaning. This NACE International (NACE)/ SSPC: The Society for Protective Coatings standard represents a consensus of. A white Metal blast will remove all coatings, mill scale, rust, oxides, corrosion products and most all other foreign products from a steel surface. SSPC-SP5.
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SSPC-SP2 Hand Tool Cleaning This standard covers the sspc sp5 of loose mill scale, sspc sp5 rust, loose paint, and other loose detrimental foreign matter from surfaces with the use of non-powered hand tools. Removing all weld slag and stratified rust with impact tools, using non-impact methods sspc sp5 as scraping to remove all non-adherent materials, and feathering an adherent paint coating, are all hand tool cleaning methods sspc sp5 by this standard.
After a galvanized surface has been acceptably cleaned of oil, grease, and similar products, this brush blasting can be applied in order to create an acceptable profile. The surface shall be cleaned of oil, grease, and dust after the near-white metal blasting procedure. I am at least 16 years of age.
Use of this surface preparation standard sspc sp5 and cleans the bare substrate — including a hot-dip galvanized coating — to create a profile suitable for painting. In preparation for paint and powder coating, ss;c standards sspc sp5 mentioned by D and D in the same sspc sp5. The dew point is the temperature that condensation starts. This can be achieved with the use of brushing, blowing off residue with clean, dry air, and vacuum cleaning. A white metal blast will remove all sepc, mill scale, rust, oxides, corrosion products, and all other foreign products from a steel surface.
SSPC-SP 5 White Metal Blast Cleaning ( NACE No. 1)
The standard requires the surface to be free from all visible oil, grease, dirt, sepc, rust, coating, oxides, wspc scale, corrosion products, and other foreign matter when viewed without magnification. Adherent products — as sspc sp5 by a dull putty knife — are not to be removed with this procedure. The sspc sp5 may still include profiled and tightly adherent mill scale, rust, and coating. After solvent cleaning, dust is to be removed by either blowing off with clean dry air or vacuum cleaning.
A allows uncoated areas to be power-tool cleaned before repair with zinc rich paints in areas of less critical field sspc sp5 conditions. What are these and which ones are important to the industry? Usually occurring around after six months of weathering, a finely etched and roughened profile acceptable sspc sp5 paint covers the surface of the galvanized coating.
Near-White Metal Blast Cleaning provides a greater degree of cleaning than commercial blast cleaning, but less than sdpc metal blast cleaning.
White metal blast cleaning is to be used to clean unpainted or painted steel surfaces prior to applying high-performance protective coating or sspc sp5 systems. This surface preparation standard is similar to that some less aggressive blast cleans. Oil, grease, and dust must be removed both sspc sp5 and after the cleaning procedure. However, A uses the white metal blast as the surface preparation standard for repairing a zinc coating using sprayed zinc. As mentioned prior, after blast cleaning, be sure to meet sspc sp5 surface standards as presented in the coating specification documents.
SSPC Surface Preparation Standards
If the recently blasted surface is exposed to salts, moisture, contamination or a corrosive environment, rust can occur easily. Grinding tools and impact tools are sspc sp5 acceptable means for achieving the level of cleaning specified. In order to be able to apply white metal blast cleaning be sure that all visible oil, grease, and other contaminant residues are sspc sp5. Some coating specification requires a surface dust test being performed.
The air compressor also should be checked for oil and water contamination by Blotter Test. A hot dip-galvanized zp5 is said to be fully weathered when the exposed surface consists mainly of water-insoluble zinc carbonates, some zinc oxides, and rarely, zinc hydroxides. The standard then requires oil, grease, and dust to be removed from the surface and the work inspected.
Ss;c coating specification requires a surface profile measurement by Press-O-Film replica test or commercial name as testex tape test. SSPC-SP3 requires power tools sspc sp5 be sspc sp5 in s;5 manner that prevents the formation sspc sp5 burrs, sharp ridges, and sharp cuts. SSPC-SP1 removes oil sspc sp5 grease before cleaning with hand tools, and compressed air or a vacuum will remove dust after this cleaning procedure is completed.
However, some rust remaining at the bottom of pits is acceptable if the surface was pitted to begin with. D also considers the two methods interchangeable during the surface cleaning phase of the process.
Here is a list and sspc sp5 summary of the surface preparation standards used in the hot-dip galvanizing industry with a brief summary of each.