Solvent Cleaning - Removal of all
detrimental foreign matter such as oil, grease, dirt, soil, salts,
drawing and cutting compounds, and other contaminants from steel
surfaces by the use of solvents, emulsions, cleaning compounds,
steam or other similar materials and methods which involve a solvent
or cleaning action.
Hand Tool Cleaning - Removal of all
rust scale, mill scale, loose rust and loose paint to the degree
specified by hand wire brushing, hand sanding, hand scraping, hand
chipping or other hand impact tods or by a combination of these
methods. The substrate should have a faint metallic sheen and also
be free of oil, grease, dust, soil, salts and other contaminants.
Power Tool Cleaning - Removal of all
rust scale, mill scale, loose paint, and loose rust to the degree
specified by power wire brushes, power impact tools, power grinders,
power sanders or by a combination of these methods. The substrate
should have a pronounced metallic sheen and also be free of oil,
grease, dirt, soil, salts and other contaminants. Surface should not
be buffed or polished smooth.
Flame Cleaning - Removal of all loose
scale, rust and other detrimental foreign matter by passing high
temperature, high velocity oxy-acetylene flames over the entire
surface, followed by wire brushing. Surface should also be free of
oil, grease, dirt, soil, salts and other contaminants.
White Metal Blast Cleaning - Removal of
all mill scale, rust, rust scale, paint or foreign matter by the use
of abrasives propelled through nozzles or by centrifugal wheels. A
White Metal Blast Cleaned Surface Finish is defined as a surface
with a gray-white, uniform metallic color, slightly roughened to
form a suitable anchor pattern for coatings. The surface, when
viewed without magnification, shall be free of all oil, grease,
dirt, visible mill scale, rust, corrosion products, oxides, paint,
or any other foreign matter.
Commercial Blast Cleaning - Removal of
mill scale, rust, rust scale, paint or foreign matter by the use of
abrasives propelled through nozzles or by centrifugal wheels, to the
degree specified. A Commercial Blast Cleaned Surface Finish is
defined as one from which all oil, grease, dirt, rust scale and
foreign matter have been completely removed from the surface and all
rust, mill scale and old paint have been completely removed except
for slight shadows, streaks, or discolorations caused by rust stain,
mill scale oxides or slight, tight residues of paint or coating that
may remain; if the surface is pitted, slight residues of rust or
paint may by found in the bottom of pits; at least two-thirds of
each square inch of surface area shall be free of all visible
residues and the remainder shall be limited to the light
discoloration, slight staining or tight residues mentioned above.
Brush-Off Blast Cleaning - Removal of
loose mill scale, loose rust, and loose paint, to the degree
hereafter specified, by the impact of abrasives propelled through
nozzles or by centrifugal wheels. It is not intended that the
surface shall be free of all mill scale, rust, and paint. The
remaining mill scale, rust, and paint should be tight and the
surface should be sufficiently abraded to provide good adhesion and
bonding of paint. A Brush-Off Blast Cleaned Surface Finish is
defined as one from which all oil, grease, dirt, rust scale, loose
mill scale, loose rust and loose paint or coatings are removed
completely but tight mill scale and tightly adhered rust, paint and
coatings are permitted to remain provided that all mill scale and
rust have been exposed to the abrasive blast pattern sufficiently to
expose numerous flecks of the underlying metal fairly uniformly
distributed over the entire surface.
Pickling - Removal of all mill scale,
rust and rust scale by chemical reaction, or by electrolysis, or by
both. It is intended that the pickled surface shall be completely
free of all scale, rust, and foreign matter. Furthermore, the
surface shall be free of unreacted or harmful acid or alkali, or
smut.
Weathering Followed By Blast Cleaning -
Weathering to remove all or part of the mill scale followed by one
of the blast cleaning standards.
Near-White Blast Cleaning
- Removal of nearly all mill scale, rust, rust scale, paint,
or foreign matter by the use of abrasives propelled through nozzles
or by centrifugal wheels, to the degree hereafter specified. A
Near-White Blast Cleaned Surface Finish is defined as one from which
all oil, grease, dirt, mill scale, rust, corrosion products, oxides,
paint or other foreign matter have been completely removed from the
surface except for very light shadows, very slight streaks or slight
discolorations caused by rust stain, mill scale oxides, or light,
tight residues of paint or coating that may remain. At least 95
percent of each square inch of surface area shall be free of all
visible residues, and the remainder shall be limited to the light
discoloration mentioned above.
