Quick Reference Guide for Durometers


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DUROMETER TYPES
APPLICATIONS
INDENTOR SHAPE
MAIN SPRING
TYPE A
(ASTM D2240)
Soft rubber, plastics, and elastomers, printer's rolls.
Flat Cone Point
35° Included Angle
822 GM
1.81 LB.
TYPE D
(ASTM D2240)
Hard rubber and plastics such as thermo plastics, flooring and bowling balls.
Sharp Cone Point
30° Included Angle
4536 GM
10.0 LB.
TYPE B
(ASTM D2240)
Harder elastomers and plastics. Paper and fibrous materials, Use above 93 Duro A.
Sharp Cone Point
30° Included Angle

822 GM
1.81 LB
TYPE C
(ASTM D2240)
Medium hard elastomers and plastics. Also useful to avoid surface marks.
Flat Cone Point
35° Included Angle
4536 GM
10.0 LB
TYPE DO
(ASTM D2240)
Dense granular material, textile windings.
3/32" Spherical
4536 GM
10.0 LB
TYPE O
(ASTM D2240)
Very soft elastomers, textile windings, soft granular materials. Use below 20 Duro A.
3/32" Spherical
822 GM
1.81 LB
TYPE OO
(ASTM D2240)

Light foams, sponge rubber gels, animal tissue.
3/32" Spherical
113 GM
TYPE OOO
(NOT ASTM)

Ultra soft gels and sponge rubber.
1/2" Spherical
113 GM
TYPE M
(ASTM D2240)
Materials as thin as .050"
Sharp Cone Point
30° Included Angle
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