Durometer Hardness Shore Hardness ASTM D2240

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Durometer Hardness Shore Hardness ASTM D2240
Scope:
8 l$ ~  X& n3 RDurometer Hardness is used to determine the relative hardness of soft materials, usually plastic or rubber. The test measures the penetration of a specified indentor into the material under specified conditions of force and time. The hardness value is often used to identify or specify a particular hardness of elastomers or as a quality control measure on lots of material.
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Test Procedure:
  B( T5 R" Q5 @7 v. Y" y4 NThe specimen is first placed on a hard flat surface. The indentor for the instrument is then pressed into the specimen making sure that it is parallel to the surface. The hardness is read within one second (or as specified by the customer) of firm contact with the specimen.
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$ \0 {/ i+ q! n9 m1 J, y; RSpecimen size:
6 W- [7 _6 w; R, Y1 d! O2 lThe test specimens are generally 6.4mm (¼ in) thick. It is possible to pile several specimens to achieve the 6.4mm thickness, but one specimen is preferred.

& Q/ W3 Q3 J0 \; L6 @2 E1 L+ f: RData:
; D4 Y! V- L6 B2 v) S" I2 S, }/ uThe hardness numbers are derived from a scale. Shore A and Shore D hardness scales are common, with the A scale being used for softer and the D scale being used for harder materials.
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3 e9 y/ u, a7 |' x7 t# {1 P9 {Equipment Used:
! k0 W  K8 d5 g1 xZwick Durometer Hardness Tester

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