MIL-HDBK-1110
Table 7
SSPC and NACE Standards for Cleaned Steel Surfaces
Method
SSPC No.
NACE
Intended Use
No.
Solvent
SSPC SP 1
Removal of oil and grease prior to further
Cleaning
cleaning by another method
Hand Tool
SSPC SP 2
Removal of loose mill scale, rust, and paint
Power Tool
SSPC SP 3
Faster removal of loose mill scale, rust, and
coatings than hand tool cleaning
White Metal
SSPC SP 5 NACE 1 Removal of visible contaminants on steel
Blast
surfaces; highest level of cleaning for steel
Commercial
SSPC SP 6 NACE 3 Removal of all visible contaminants except
Blast
that one third of a steel surface may have
shadows, streaks, or stains
Brush-Off
SSPC SP 7 NACE 4 Removal of loose mill scale, rust, and paint
Blast
(loose paint can be removed with dull putty
knife)
Pickling
SSPC SP 8
Removal of mill scale and rust from steel
Near-White
SSPC SP
NACE 2 Removal of visible contaminants except that 5
Blast
10
percent of steel surfaces may have shadows,
streaks, or stains
Power Tool
SSPC SP
Removal of visible contaminants (surface is
Cleaning
ll
comparable to SSPC SP 6, also provides
profile)
6.5.2
Standards for Cleaned Nonferrous Metals. No industry
standards describe the degree of cleaning of nonferrous metals,
and previously painted non-steel substrates.
6.5.3
Previously Coated Surfaces. When the surface to be
painted is an old weathered coating film (that is, surface
preparation will not include removal of the old coating), ASTM
visual standards should be used for chalk, mildew, and dirt
removal. In general, a minimum chalk rating (ASTM D 4214,
Evaluating Degree of Chalking of Exterior Paint Films) of 8
should be required for chalk removal, a minimum mildew removal
rating (ASTM D 3274, Evaluating Degree of Surface Disfigurement
of Paint ) of 8 (preferably 10) should be required for mildew
removal, and an ASTM D 3274 rating of 10 should be required for
dirt removal. Consideration should be given to requiring
preparation of a job-specific standard (as described in
par. 6.5.1.2) when large jobs are contracted. This standard
should cover removal of loose material, chalk, and mildew, as
well as feathering of edges, and other requirements of the
contract specification.
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