MIL-HDBK-1110
Table 9
Typical Physical Characteristics of Abrasives (1)
Shape
Specific
Bulk
Color
Free
Degree
Gravity Density
Silica
of
(pounds
Wt
Dusting
per
Percent
cubic
foot)
Naturally Occurring Abrasives
(Mohs Scale)
Sands:
Silica
5
Rounded
2 to 3
100 White
90 +
High
Mineral
5 to 7
Rounded
3 to 4
123 Variable
<5
Medium
Flint
6.7 to 7
Angular
2 to 3
80 Lt.
90 +
Medium
Grey
Garnet
7 to 8
Angular
4
145 Pink
Nil
Medium
Zircon
7.5
Cubic
4.5
185 White
Nil
Low
Novaculite
4
Angular
2.5
100 White
90 +
Low
By-Product Abrasives
(Mohs Scale)
Slags:
Boiler
7
Angular
2.8
85
Black
Nil
High
Copper
8
Angular
3.3
110
Black
Nil
Low
Nickel
8
Angular
2.7
85
Green
Nil
High
Walnut Shells
3
Cubic
1.3
45
Brown
Nil
Low
Corn Cobs
4.5
Angular
1.3
30
Tan
Nil
Low
Manufactured Abrasives
(Mohs Scale)
Silicon
9
Angular
3.2
105 Black
Nil
Low
Carbide
Aluminum Oxide 8
Blocky
4.0
120 Brown
Nil
Low
Glass Beads
5.5
Spherical 2.5
100 Clear
67
Low
Metallic Abrasives
(Rockwell C)
Cast Steel (2) as spec. or
Spherical 3 to 10
Grey
Nil
Shot & Grit
range 35-65 RC
or Angular
Malleable Iron range:
Spherical 3 to 10
Grey
Nil
Shot or Grit 28-40 RC
or Angular
Chilled
Cast Iron
range:
Spherical 3 to 10
Grey
Nil
Shot or Grit 57-65 RC
or Angular
NOTES:
(1)
Taken from SSPC SP COM, Steel Structures Painting
Manual, Systems and Specifications, Vol. 2, p. 17,
and Vol. 1 of Good Painting Practice, p. 34.
(2)
Represents 85 percent of the metallic abrasives
used.
89
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