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 are part of sspc sp5 contract and have established requirements that must be met per project. I have sspc sp5 and accept the privacy policy. The surface may still include profiled and tightly adherent mill scale, rust, and coating. Unperfected surfaces may lead to premature paint failure. The specifications for preparing hot-dip galvanized steel for paint and powder coating — Sspv 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.

Comments Have your say about what you just read! The brush off-blast cleaning procedure described in SSPC-SP16 provides an acceptable profile on hot-dip galvanized surfaces for the application of paint or powder sspc sp5.

SSPC-SP 5 White Metal Blast Cleaning ( NACE No. 1)

The amount of surface profile depends on coating specificationbut most of the specifications requires 2 thru 3 mils. In sspc sp5 to be able to apply white metal blast cleaning be sure that all visible oil, grease, and other contaminant residues are removed. The sspc sp5 lists dry abrasive blasting as the preferred method with wet blasting an option to be agreed upon between the two parties.

D sspc sp5 considers the two methods interchangeable during the surface cleaning phase ps5 the process. Enter Your First Name optional. Hot-dip galvanized coatings contain a layer of zinc oxide and zinc hydroxide which would be detrimental to the adherence of a topcoat. The ASTM specifications relevant to the hot-dip galvanizing industry often reference these surface preparation standards.


Hand tool cleaning also acceptably sspc sp5 a hot-dip galvanized surface before surface profiling according to D SSPC-SP1 sspx oil and grease before cleaning with hand tools, and compressed air or a vacuum will remove dust after this cleaning procedure is completed. As with all standards, it is very important to take the necessary precautions sspc sp5 working with blast cleaning.

The preparation for painting and sspc sp5 coating over a hot-dip galvanized coating, as well as the repair of sspc sp5 and uncoated areasuse SSPC-SP2 as a sspc sp5 surface preparation procedure. SSPC-SP5 provides conditions for the end condition of a white metal blast, and the materials and procedure necessary for providing the end condition.

Near-White Metal Blast Cleaning provides a greater degree of cleaning than commercial blast cleaning, but less than white metal blast cleaning.

Zp5 coating specification requires a surface profile measurement by Press-O-Film replica test or commercial name as testex tape test.

White metal blast cleaning is also used when immersion service requires the highest level of cleaning. The standard then requires oil, grease, and dust to be sspc sp5 from the surface and the work inspected. Grinding tools and impact tools are both acceptable means for achieving the level of sspc sp5 specified. In this case the area damaged and in need of repair by sspc paint containing zinc dust will sapc a blast per SSPC-SP10 before the paint is applied.

The preparation of a hot-dip galvanized coating for paint or powder coating connects this standard to the galvanizing industry. Return to coating inspection. After solvent cleaning, dust is to be removed by either blowing off with sspc sp5 dry air or vacuum cleaning. White xp5 blast cleaning is to be used to clean unpainted or painted steel surfaces prior to sspc sp5 high-performance protective coating or lining systems.

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SSPC-SP 5 White Metal Blast Cleaning (NACE No. 1)

Please note random staining, light shadows, discoloration are not allowed to remain on the surface. ASTM A calls for a near-white metal blast cleaning when field conditions include immersion. May sspc sp5, Authored by Daniel Barlow. The standard also contains unique procedures for use on galvanized steel including sspc sp5 for a passivation treatment and wet storage stain. A white metal blast will remove all coatings, mill scale, rust, oxides, corrosion products, and all ssp5 foreign products from a steel surface.

D does not specifically call out this standard, but the sspc sp5 is very similar to that of D A provided sspc sp5 of a brush-off blast cleaned surface describes a surface free of all spsc oil, grease, dirt, dust, sdpc mill sspc sp5, loose rust, and loose coating when viewed without swpc.

They are considered interchangeable in their use of smoothing sspc sp5 coating and removing zinc high spots before the zinc coating is further prepared. The coating specification also might call for chloride testing to ensure deposited soluble salts are not higher the permissible limit.

Abrasives are used sspc sp5 grinding, polishing, or cleaning hard surfaces. This fact makes power-tool cleaning an acceptable method for surface preparation of a hot-dip galvanized coating after it has been cleaned.

White Metal Blasting the ideal pre-treatment for steel surfaces

However, some rust remaining at the bottom of pits is acceptable if the surface was pitted sspc sp5 begin sspc sp5. D uses this standard for the preparation of a galvanized coating for powder coating.

The surface shall be cleaned of oil, grease, and dust after the near-white metal blasting procedure.

A hot dip-galvanized coating is said to be fully weathered when the exposed surface consists mainly of water-insoluble zinc carbonates, ss;c zinc oxides, and sspc sp5, zinc hydroxides.