SPECTRUM
Surface Finishes

Microinch Arithmetical Averages

Group "D"
For heavy stock removal
Lap Density
Mu. In.
(Mean Average)
Grade No. and
Grit Size
Spectrum Diamond
Hard
Soft
(Mesh Equivalent)
Compound Color
40-45
12-16
#150 Black
100 Mesh
35-40
8-10
#120 Red
120 Mesh
30-35
5-6
#90 Orange
170 Mesh

Group "C"
For fast stock removal
Lap Density
Mu. In.
(Mean Average)
Grade No. and
Grit Size
Spectrum Diamond
Hard
Soft
(Mesh Equivalent)
Compound Color
20-25
3-4
#60 Tan
54-80 Microns
10-15
2-3
#45 Yellow
36-54 Microns
6-8
1-1.5
#30 Green
22-36 Microns

Group "B"
For general purpose high polish mirror finishes
Lap Density
Mu. In.
(Mean Average)
Grade No. and
Grit Size
Spectrum Diamond
Hard
Soft
(Mesh Equivalent)
Compound Color
4-5
.5-.75
#15 Light Blue
12-22 Microns
3-4
.5
#9 Dark Blue
8-12 Microns
3
.4
#6 Indigo
4-8 Microns

Group "A"
For finest select work
Lap Density
Mu. In.
(Mean Average)
Grade No. and
Grit Size
Spectrum Diamond
Hard
Soft
(Mesh Equivalent)
Compound Color
2
.2
#3 Violet
2-4 Microns
1
.0+
#1 White
0-2 Microns
.5
.00
#1/2 Grey
0-1 Microns
.3
.000
#1/4 Ivory
0-1/2 Microns
.1
.0000
#1/10 Pink
0-1/5 Microns

 

Lap Density
Hard
(Metal, etc.)
Medium
(Hard Wood, Etc.)
Soft
(Paper, etc.)

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