What is shore hardness and how is it measured? The Shore durometer is a device for measuring the hardness of a material, typically of polymers, elastomers, and rubbers.Named after its inventor, Albert Ferdinand Shore, Shore hardness offers different scales for measuring the solidity of different materials.
A standardised test used industry-wide, the Shore D hardness technique measures the depth of penetration of an indenter, generally using ASTM D2240 and ISO 868 test methods. With readings taken between 0 and 100, Shore hardness measures are dimensionless.Each scale will result in a value from 0 and 100, with the higher number relating to increased hardness.
The Shore A and Shore D: The A scale is for softer ones, while the D scale is for harder ones. Shore A is specified for softer elastomer measurements using a needle with a blunted point. Shore D is specified for harder elastomer measurements using a needle that ends with a 30° point angle and is not blunted.
How Does a Shore Hardness Test Work? Shore D Hardness is a standardized test consisting in measuring the depth of penetration of a specific indenter. Durometer, like many other hardness tests, measures the depth of an indentation in the material created by a given force on a standardized presser foot. This depth is dependent on the hardness of the material, its viscoelastic properties, the shape of the presser foot, and the duration of the test. ASTM D2240 durometers allows for a measurement of the initial hardness, or the indentation hardness after a given period of time. The basic test requires applying the force in a consistent manner, without shock, and measuring the hardness (depth of the indentation). If a timed hardness is desired, force is applied for the required time and then read. The material under test should be a minimum of 6 mm (0.25 inches) thick. GESTERShore A Durometer GT-KD09-LX-A is designed for vulcanized rubber and plastic hardness testing. The A scale for rubbers in the normal-hardness range. This instruments simple structure and easy to use, light-type body, intuitive readings.
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