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
(ASTM D2240) |
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 |
|
TYPE RR
(NOT ASTM) |
Drywall, fiberboard, artificial brick
|
1/2"
|
- 1410 GM
|
TYPE CF
(NOT ASTM) |
Foam padding
|
1/2"
|
- 20 lbs.
|
|
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