| 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 | |
