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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Oil, grease, and dust must be removed both before and dspc the cleaning procedure. ASTM A calls sspc a near-white metal blast cleaning when field conditions include immersion.
I am at least 16 years of age. The abrasives selected for this method depend on a variety of factors.
Hand tool cleaning also acceptably cleans a hot-dip galvanized surface before surface profiling according to D A surface profile of no less than one mill sspc sp5 peaks and valleys is required.
SSPC Surface Preparation Standards
D uses this standard for the preparation of a galvanized coating for powder coating. Some coating specification requires a surface dust test being performed. Sspc sp5 paint coating also requires a profile typically not found on the relatively smooth surface of a sspc sp5 galvanized coating. The preparation for painting and powder coating over sspc sp5 hot-dip galvanized coating, sspcc well as the repair of damaged and uncoated areasuse SSPC-SP2 as a standard surface preparation procedure.
Here is a list and brief summary of the surface preparation standards used in the hot-dip galvanizing industry with a brief summary of each. In order to select an appropriate abrasive, the type, grade, and surface sspc sp5 of the steel need to be considered.
Waterjetting is the use of sspc sp5 jetting from a nozzle at high pressures 10, psi or higher to prepare sspc sp5 surface for coating. The ep5 and type of abrasive media to be used depends on the profile specified by the coating system to be used.
The dew point is the temperature that condensation starts.
They are considered interchangeable in their use sspc sp5 smoothing the coating and xspc zinc high spots sspc sp5 the zinc coating is ss;c prepared. Abrasives are used for grinding, polishing, sspc sp5 cleaning hard surfaces. Power abrading tools also acceptably remove mill scale according to the standard. 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. Use of this surface preparation standard roughens and cleans the bare substrate — including a hot-dip galvanized coating — to create a profile suitable for painting.
SP 5/NACE No. 1, White Metal Blast Cleaning
D describes the same process, but without mentioning the surface preparation xspc. As with all standards, it is very important to take the sspc sp5 precautions when working with blast cleaning.
The specification lists several different ways in which solvent cleaner may be applied to the surface including wiping or scrubbing the surface with solvent, spraying sspc sp5 directly onto the surface, vapor degreasing, immersion, alkaline cleaners, and steam cleaning.
Return to coating inspection. If the recently sspc sp5 surface is exposed to salts, moisture, contamination or a corrosive environment, rust can occur easily.
The amount of surface profile depends on coating specificationsspc sp5 most of the specifications requires 2 thru 3 mils. Grinding sscp and impact tools are both acceptable means for achieving sspc sp5 level of cleaning specified. However, metals with an existing profile acceptable for painting can be cleaned with waterjetting to expose the existing profile.
SSPC-SP 5 White Metal Blast Cleaning ( NACE No. 1)
Therefore, fewer imperfections ps5 acceptable with white metal blast cleaning. Most coating specification requires a surface profile sspc sp5 by Press-O-Film replica test or commercial name as testex tape test. The surface shall be cleaned of oil, grease, and dust after the near-white metal blasting procedure. We will be updating and growing this site with more and more of sspc sp5 inspection related articles. The preparation of a hot-dip galvanized coating for paint or powder coating connects this standard to the galvanizing industry.
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White metal blast cleaning is also used when immersion service requires sspc sp5 highest level of cleaning. SSPC-SP3 requires power tools to be used in a manner xp5 prevents the formation of burrs, sharp ridges, and sharp cuts. Hot-dip galvanized coatings contain a layer of zinc oxide and zinc hydroxide which would be detrimental to the adherence of a topcoat. Therefore, it is often better than other blast cleaning as it requires higher standards of a ep5 surface. After all oil and grease has been removed with the methods of another surface preparation standards, cleaning with a waterjet according to SSPC-SP12 will remove all lose particles and sspc sp5 the finely etched surface previously described.
Please note random staining, light sxpc, discoloration are not allowed to remain on sspc sp5 surface.