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Sand (Ottowa Silica)
g/cc
Sizes
Usual
Viscosity
Pro
Con
2.7
.8 and 1.3 mm
600/1600
CPS
Cheap.
OK for white.
Readily available.
Non-spherical.
May "fracture."
Limited sizes
Soda Lime Glass
g/cc
Sizes
Usual
Viscosity
Pro
Con
2.5
.5 - 5 mm
600/1600
CPS
Uniform shape (spherical).
Closely sized.
High strength.
OK for white.
Moderate cost.
Readily available.
Viscosity limitation.
Modified Alumina
27% Silica Oxide (mullite)
g/cc
Sizes
Usual
Viscosity
Pro
Con
2.8
1/16" or 1/8"
1000/1600
CPS
Very high strength.
Long wearing.
High density.
OK for white.
Not spherical.
High cost.
Not closely graded for sizes.
Ceramic Alumina Oxide
g/cc
Sizes
Usual
Viscosity
Pro
Con
3.6
1/16" or 1/8"
1600/2500
CPS
Very high strength.
Long wearing.
High density.
OK for white.
Abrasive to mill parts.
High cost.
Not spherical.
Not closely graded for sizes.
Ceramic Zirconia
g/cc
Sizes
Usual
Viscosity
Pro
Con
5.4
1 - 3.35 mm
2300 CPS/Above
Very high density and strength.
Long wearing in high viscosities.
OK for white.
Abrasive to mill parts in low viscosities. Not closely graded.
Not spherical.
Highest cost of Non-Ferrous.
Zirconia Silicate, 30% Silica
g/cc
Sizes
Usual
Viscosity
Pro
Con
3.75
.5-2.5 mm
600/2900
CPS
High density.
Long wearing.
High strength.
OK for white.
Closely graded.
Spherical.
High cost.
May be abrasive to mill parts in low viscosities.
Contains a few "hollows."