Hoto Model X Asker Durometer

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.

Indentor Type
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.