Durometer Indenter Specifications

TYPE

Main spring

travel

INDENTER

DESCRIPTION

INDENTER
IMAGE

APPLICATIONS

A
ASTM D2240
JIS K6253
ISO 868 

8.05N

Truncated Cone
35° Included Angle

Soft rubber,elastomers,

neoprene, silicone,

vinyl, nitrile, and butyl, 

Soft plastics,

felt, leather, waxes,

printing rollers

and similar materials

B
ASTM D2240

8.05N

Conical
30° Included Angle

Rubber, elastomers, 
use when off the high
end of the A scale

C
ASTM D2240

44.5N

Truncated Cone
35° Included Angle

Medium hard
rubber or plastics
use when off the
low end of the D scale

D
ASTM D2240
JIS K6253
ISO 868

44.5N

Conical
30° Included Angle

Hard rubber, plastics,

acrylic, delrin, kevlar,

 pvc, nylon,lexan, 

epoxies and 

similar materials

DO
ASTM D2240

44.5N

3/32" Spherical
Diameter
(2.38mm)

Dense textile

winding, medium

printing rollers

O
ASTM D2240

8.05N

3/32" Spherical
Diameter
(2.38mm)

Soft printing rollers,

textile windings

OO
ASTM D2240

1.11N

3/32" Spherical
Diameter
(2.38mm)

Sponge rubber,

very soft rubber

OOO
ASTM D2240

1.11N

1/2" Spherical
Diameter
(12.7mm) 

Very soft materials, 

(e.g.) open cell foam