Glossary of Industrial Painting Terms
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The surface shall be clean, dry, and free of oil, grease, wax, form oils, and any other contaminant that may effect the adhesion of the coating. For best results and high performance requirements remove latencies and contaminants from precast and cast-in-place concrete by abrasive blasting or high pressure water blasting.
Dry means that the substrate contains less then 15% moisture.
Concrete should be cured at least 28 days and mortar joints at least 15 days @ 75 F and 50% RH.
See also: ASTM D 4263 - 83; ASTM D 4258 - 83; ASTM D 4259 - 83; ASTM D 4260 - 83; ASTM D 4261 - 83; ASTM D 4662 - 83
(Noun) A pigmented liquid designed for application to a substrate, in a thin layer, which is then converted to an solid film. Paint is designed to protect and/or decorate the surface it is applied to.
In the case of other chemicals, such as alkali's or acids, other combinations of iron salts are formed as part of the corrosion product. The electrochemical corrosion process may be retarded or stopped by the proper use of protective coatings.
One preventive method provides an insulation barrier between the corrosive environment and the metallic substrate. An even more effective method is to use a more reactive metal such as zinc. A conductive zinc-filled coating protects the metal by galvanic protection. The zinc sacrifices itself and corrodes in preference to the steel.
A method for removing all visible oil, grease, soil, drawing and cutting compounds, and other soluble contaminants from steel surfaces.
Intended for use prior to the application of paint and in conjunction with surface preparation methods specified for the removal of rust, mill of rust, mill scale or paint.
A method of cleaning steel surfaces by the use of non-power hand tools.
Removes all loose mill scale, loose rust, loose paint, and other loose detrimental foreign matter . It is not intended that adherent mill scale, rust, and paint be removed by this. Mill scale, rust, and paint are considered adherent if they cannot be removed by lifting with a dull putty knife.
ISO 8501-1:1988 or other usual standards may be used to further define the surface, if agreed upon by all parties involved.
A method of preparing steel surfaces by the use of power assisted hand tools.
Removes all loose mill scale, loose rust, loose paint, and other loose detrimental foreign matter, it is not intended that adherent mill scale, rust, and paint be removed by this process. Mill scale, rust, and paint are considered adherent if they cannot be removed by lifting with a dull putty knife.
IS0 8501-1:1988 or other visual standards of surface preparation agreed upon by the contracting parties may be used to further define the surface.
When viewed without magnification the surface shall be free of all visible oil, grease, dirt, dust, mill scale, rust, paint, oxides, corrosion products, and other foreign matter.
Acceptable variations in appearance that do not affect surface cleanliness include variation caused by the type of steel, original surface condition, thickness of the steel, weld metal, mill or fabrication marks, heat treating, heat affected zones, blasting abrasive, and differences in the blast pattern.
SSPC-VIS 1-89 or other visual standards of surface preparation may be specified to supplement the written definition..
When viewed without magnification the surface shall be free of all visible oil, grease, dirt, dust, mill scale, rust, paint, oxides, corrosion products and other foreign matter, except for staining as noted below.
Staining shall be limited to no more than 33% of each square inch of surface area and may consist of light shadows, slight streaks or minor discoloration's caused by stains of rust, stains of mill scale, or stains of previously applied paint. Slight residues of rust and paint may also be left in the bottoms of pits, if the original surface was pitted.
SSPC-VIS 1-89 may be used to supplement this written spec.
When viewed without magnification the surface shall be free of all visible oil, grease, dirt, dust, loose mill scale, loose rust, and loose paint. Tightly adherent mill scale, rust and paint may remain on the surface. Mill scale, rust and paint are considered adherent if they cannot be removed by lifting with a dull putty knife.
The entire surface shall be subjected to the abrasive blast. The remaining mill scale, rust or paint shall be tight.
SSPC-VIS 1-89 may be used to supplement the written spec.
A method of preparing steel surfaces by chemical reaction, electrolysis, or both. The surfaces when viewed without magnification shall be free of all visible mill scale and rust.
Near-white blasted surfaces, when viewed without magnification, shall be free of all visible oil, grease, dirt, mill scale, rust, paint, oxides, corrosion products, and other foreign matter, except for staining as noted below.
Staining shall be limited to no more than 5% of each square inch of surface area and may consist of light shadows, slight streaks, or minor discoloration's caused by stains of rust, stains of mill scale, or stains of previously applied paint.
Differs from SSPC-SP 3 in that SP 3 requires only the removal of loosely adherent materials and does not require producing or retaining a surface profile.
Surfaces prepared per this spec, when viewed without magnification, shall be free of all visible oil, grease, dirt, dust, mill scale, rust, paint, oxide, corrosion products, and other foreign matter slight residues of rust and paint may be left in the lower portions of pits if the original surface is pitted.
Typically the structure is coated with the first coat and the applicator then turns around and begins the second application. As an example, if you have an I-beam or a railcar, the complete structure has the first coat applied before the second coat begins. Depending upon what is being coated the time between coats will vary dramatically. The key to the whole concept is that it is two independent coats. By applying the coating in two distinctive coats or applications, it minimized the problems with pinholes, light millage areas, and solvent entrapment. The misconception has been that you can apply the total thickness requirement in one coat with multiple passes. Some of the problems associated with one coat are not alleviated by the thicker film.