CHARTS AND TABLES
DEGREES OF
CLEANLINESS OF
BLAST-CLEANED
SURFACES
*Images shown are previously uncoated
surfaces, viewed without magnification.
KEY: Steel where mill scale has started
to flake and light rusting occurs
KEY: Steel where all mill scale has flaked
off and complete rusting has taken place
KEY: Steel where pitting and complete
rusting has occurred
SSPC Std. NACE Std.
SIS Std.
BRUSH-OFF
Tightly adherent mill scale, rust,
and coatings may remain on the
surface. Mill scale, rust and
coatings are considered adherent
if they cannnot be removed with
a dull putty knife.
Brush‐Off
Brush‐Off
Brush‐Off
SSPC-SP 7
NACE No 4
SA-1
COMMERCIAL
Evenly dispersed very light
shadows, streaks and
discolorations caused by rust
stains, mill scale or coatings
remain on no more than 30
percent of the surface.
Commercial
Commercial
Commercial
SSPC-SP 6
NACE No 3
SA-2
NEAR-WHITE METAL
Evenly dispersed very light
shadows, streaks and
discolorations caused by rust
stains, mill scale or coatings may
remain on no more than 5
percent of the surface.
Near‐White Metal
Near‐White Metal
Near‐White Metal
SSPC-SP 10
NACE No 2
SA-2-1/2
WHITE METAL
Free of all visible oil, grease, dirt,
dust, mill scale, rust and coatings.
White Metal
White Metal
White Metal
SSPC-SP 5
NACE No 1
SA-3
Target Products Ltd. · ABRASIVES | 6