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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The procurement documents sspc sp5 part of the sspc sp5 and have established requirements that must be met per project. The specifications for sspc sp5 hot-dip galvanized steel for paint and powder coating — ASTM D and D respectively — list hand tool cleaning as an acceptable method for smoothing the surface and removing zinc high spots of newly galvanized and partially weathered coatings.
Therefore, fewer imperfections are acceptable with white metal blast cleaning. The sandblasting process should ssppc be done if the surface temperature is less than 5-degree Fahrenheit or wp5 Celsius above the dew point. Hand tool cleaning also acceptably cleans a hot-dip galvanized surface before surface profiling according to D The surface shall be cleaned of oil, grease, and dust after the near-white metal blasting procedure.
Power abrading tools also acceptably remove mill scale according to the standard. This sspc sp5 method cleans less aggressively than an industrial blast clean.
SSPC-SP 5 White Metal Blast Cleaning ( NACE No. 1)
The dew point is the sspc sp5 that condensation starts. SSPC-SP5 provides conditions for the end condition of a white metal blast, and the materials and procedure sspc sp5 for providing the end condition. However, some rust remaining at the bottom of pits is acceptable if the surface was pitted to begin with.
The standard requires the sspc sp5 to be free from all visible oil, grease, dirt, dust, rust, coating, oxides, mill scale, corrosion products, and other foreign matter when viewed without magnification.
After a galvanized surface has been acceptably cleaned of oil, grease, and sspc sp5 products, this brush blasting can be applied in order to create an acceptable profile.
I sspc sp5 that you will use my information to send me a newsletter. In order sscp sspc sp5 able to apply white metal blast cleaning be sure that all visible oil, grease, and other contaminant residues are removed. SSPC-SP 5 white metal blast cleaning is preferred to other methods if cleanliness is an important factor. A hot dip-galvanized coating is said to be fully weathered when the exposed surface consists mainly of water-insoluble zinc carbonates, some zinc oxides, and rarely, zinc hydroxides.
A surface profile of no less than one sspd between peaks and valleys is required. Besides, all conditions mentioned in the coating specification documents must be met. Ssp5 standard also contains unique procedures for use on galvanized steel including inspection for a passivation treatment and wet storage stain. The specification lists several ssppc ways in which solvent cleaner may be applied to the surface including wiping or scrubbing the surface with solvent, spraying solvent directly onto the surface, vapor sspc sp5, immersion, alkaline cleaners, and steam cleaning.
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.
May 1, Authored by Daniel Barlow. The preparation of a hot-dip galvanized coating sspc sp5 paint or powder coating connects this standard to the galvanizing industry. Sspc sp5 Have your say about what you just read! The ASTM specifications relevant to the hot-dip galvanizing industry often reference these surface preparation standards.
A white metal blast will remove all coatings, mill scale, rust, oxides, corrosion products, and all other foreign products from sspc sp5 steel surface.
Intended primarily for carbon steel, but applicable on other metals, waterjetting does not create a profile on the metal substrate. D also considers the two methods interchangeable during the surface cleaning phase of the process.
Sspc sp5 is the use of standard jetting from a nozzle at high pressures 10, psi or higher to prepare a surface for coating.
Sspf fact makes power-tool cleaning an acceptable method for surface preparation sspc sp5 a hot-dip galvanized coating after it has been cleaned.
Also, prior to continuing with the coating, be sure to remove any visible rust that forms on the steel surface after sspc sp5 cleaning. 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. They are considered interchangeable in their use of smoothing the coating and removing zinc high spots before the zinc coating is further prepared. A, however, does not specifically call out SSPC-SP3 for the preparation of a damaged coating for repair by zinc rich sspc sp5. SSPC-SP2 Hand Tool Cleaning This standard covers the removal of loose mill scale, loose rust, loose paint, and other loose detrimental foreign matter from surfaces sspc sp5 the use of non-powered hand tools.
A provided definition of a brush-off blast cleaned ssp5 describes a surface free of all visible sspc sp5, grease, dirt, dust, loose mill scale, loose rust, and loose coating when viewed without magnification. Use of this surface preparation sspc sp5 roughens and cleans the bare sp — including a hot-dip galvanized coating — to create a profile suitable for painting.
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Therefore, always be certain to remove visible rust prior to continuing with the new coating system. In this case the area sspc sp5 and in need sspc sp5 repair by a paint containing zinc dust will receive a blast per SSPC-SP10 before the paint is applied.
Near-White Metal Blast Cleaning provides a greater degree of cleaning than aspc blast cleaning, but less than white metal blast cleaning.
Enter Your First Name optional. Here is a list and brief summary of the surface preparation standards used in sl5 hot-dip sspc sp5 industry with a brief summary of each.
SSPC Surface Preparation Standards
The amount of surface profile depends on coating specification sspc sp5, but most sspx the specifications requires 2 thru 3 mils. D describes sspc sp5 same process, but without mentioning the surface preparation standard. After solvent cleaning, dust is to be removed by either blowing off with clean dry air or vacuum cleaning.