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Hardness measurement is an important item to determine the properties of rubber, elastomer and plastic products. With easy operation and quick measurement, hardness tester is widely used.
As illustrated above, the hardness gauge measures the hardness of the test specimen by pressing the indenter in a specified shape onto the surface of the test specimen, applying the spring deformation force, and reading the extent to which the tip of the indenter protrudes beyond the face of the pressure base.
As discussed above, a durometer incorporates an indicator to allow readings of the extent of protrusion of the probe beyond the face of the pressure foot, giving 0 for maximum protrusion (0 displacement) and 100 for 0 protrusion, with an equidistant scale. The load applied to the test specimen through the probe is the bending force of the spring and is therefore constant, varying linearly over the range 0 to 100.
Unlike in the case of other property values, there is no specific unit for hardness measurement values. Therefore, it is not sufficient to simply describe the hardness value as “50 (degrees)”; the value must be clearly specified, for example, “Hardness 50 degrees, Shore A, according to JIS K 6253-3”. Furthermore, each standard prescribes rules for describing hardness in various ways, as the table below shows.
| Standard | Test name | Type | Description for 50(degrees) clear The test time is 1 second or less | Description for 50(degrees) clear The test time is 15 seconds. | Test Time (Time) mid point firm contact and reading point) |
| JIS K 6253-1997 Hardness test method for vulcanized rubber or thermoplastic | Durometer Hardness Test | Hardness type A | One 50/S | One 50/15/S | Within 1 second after solid contact point or when one a certain period of time has passed |
Hardness type D | D50/S | D50/15/S | |||
Hardness type E | E50/S | E50/15/S | |||
| JIS K 7215-1986 Test method Durometer hardness give hardness of plastic | Durometer Hardness Test | Hardness type A | HDA50 | Testing time is 15 seconds will be reported. | Maximum value within 1 second principles or values after a a specified period of time has passed |
Hardness type D | Hard drive 50 | ||||
| ASTM D2240-2005 Standard test method for rubber properties – Durometer Hardness | Durometer Hardness Test | Hardness type A | One 50/1 | A 50/15 | Value within 1 second or maximum value as a rule, or, with the consent of the parties concerned, value after a specified period of time has passed |
Hardness type D | D50/1 | D50/15 | |||
| ISO 48-4 Vulcanized rubber or thermoplastic — Identify indentation hardness | Durometer Hardness Test | Hardness type A | One 50/1 or one 50 | A 50/15 | Within 1 second or when one a specified period of time has passed |
Hardness type D | D 50/1 or D 50 | D50/15 | |||
Hardness type E | E 50/1 or E 50 | E50/15 | |||
| ISO 868-2003 Resin and ebonite — Identify indentation hardness by hardness tester | Durometer Hardness Test | Hardness type A | One 50/1 | A 50/15 | 15 seconds with tolerance is 1 or within 1 second. |
Hardness type D | D50/1 | D50/15 | |||
| JIS K 6301-1996 Physical testing of vulcanized rubber | Check spring stiffness | Type A | JIS 50Hs Standard | – | Immediately after contact |
| Type C | JIS 50Hs Standard | – |
(JIS K 6301 was abolished in August 1998)
rubber hardness tester TECLOCK GS SERIES rubber and plastic hardness tester
hardness tester ASKER DUROMETER TYPE A, B, C, D
Can check the operating status of Durometer using an elongation tester to check the height of the gauge as well as a load tester to check the spring load.
SEMIKI Measuring Equipment Company Limited
Email: sales@semiki.com
Phone: +84 9797 61016