Surface Preparation Standard
Surface Preparation Standard
Surface Preparation Standard
System
SSPC Codes
NACE
CDN. Govt.
(CGSB)
Swedish
Standard
British
Standard
Solvent Clean
SSPC.SP1
Hand Tool Clean
31 GP 401
St. 2
(approx.)
St. 3
SSPC.SP2
Power Tool
Clean
Flame Clean
(new steel)
White Metal
Blast
Commercial
Blast
SSPC.SP3
31 GP 402
SSPC.SP4
31 GP 403
SSPC.SP7
Pickling
Weather and
Blast
Near White
Blast
SSPC.SP8
SSPC.SP9
Power Tool
Cleaning to Bare
Metal
SSPC.SP11
SSPC.SP5
SSPC.SP6
SSPC.SP10
Non-Ferrous Metals
Aluminium
NACE
#1
NACE
#3
31 GP 404
Type 1
31 GP 404
Type 2
Sa. 3
NACE
#4
31 GP 404
Type 3
Sa. 1
Sa. 2
BS4232
First Quality
BS4232
Third
Quality
Light blast
to brush-off
NACE
#2
Sa. 2
BS4232
Second
Quality
Galvanized Metal
RMS
(Micron)
Ra
(Micro-inch)
Ra
(Micron)
Grit Finish
160
4.06
142
3.61
36
98
2.49
87
2.21
60
80
2.03
71
1.80
80
58
1.47
52
1.32
120
47
1.20
42
1.06
150
47
1.20
42 Before
Bead Blast
1.06
USDA
Bead Blast
34
0.86
30
0.76
180
21
0.53
19
0.48
220
17
0.43
15
0.38
240
14
0.36
12
0.30
320
10
0.25
0.23
400
0.13
4 (+/-)
0.10
Mirror