Model X-A* Type Shore A Normal
rubber
Model X-D* Type Shore D Hard rubber and plastics
Model X-C* Type Asker C Soft rubber and sponge
Model X-F* Type Asker F Urethane foam, sponge and polystyrene foam |
 |
Asker Hardness testers feature portable design, ease of operation,
non-destructive measurement and optional peak indicators.
The Asker High Performance series has an accuracy of .75 point and is
available in Type F for soft materials like sponge rubber and urethane foam.
Asker models are available in ASTM D 2240 durometer Types: Shore A, Shore D
and Asker C durometer scales.
*Add 'P' to the model number to specify optional peak indicator, for example
XP-A. Type F hardness testers use their own weight to determine hardness.
Hardness Tester Selection
Indentor Type
|
Indentor Type
|
|
Type Shore D |
Type Shore A |
Type Asker C |
Cone point type
Hard rubber and plastics
|
Flat point type
Normal rubber |
Hemispherical type Soft rubber and sponge |
|
 |
Shore D
|
Shore A
|
Asker C
|
Asker F
|
Cone point
Hard rubber and
plastics
|
Flat point
Normal rubber
|
Hemispherical
Soft rubber and
sponge
|
Flat surface Urethane
foam, sponge and
polystyrene foam
|
Hardness Tester Operation
As the hardness tester is pressed against the sample, the
material resistance force and indentor spring load balance. The depth of the
indentor is measured, which provides a measure of the material's hardness.
Values are based upon a 100 point scale (accuracy .75 point). However, as
time elapses the indicator will "creep" back so that a reading taken a few
seconds after the tester makes contact with the sample will be less than the
peak reading. The optional peak indicator helps to more closely monitor the
difference between peak and "creep" in hardness tests.
| X-A |
Shore A |
ASTM D-2240 |
1 kgf |
| X-D |
Shore D |
ASTM D-2240 |
5 kgf |
| X-C |
Asker C |
JIS K-7312 |
1 kgf |
| X-F |
Asker F |
Asker F use
their own weight to determine hardness |
|