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ASTM D2240 - 05(2010) Standard Test Method for Rubber Property, Durometer Hardness
This test method is based on the penetration of a specific type of indentor when forced into the material under specified conditions. The indentation hardness is inversely related
to the penetration and is dependent on the elastic modulus and viscoelastic behavior of the material. The geometry of the indentor and the applied force influence the measurements
such that no simple relationship exists between the measurements obtained with one type of durometer and those obtained with another type of durometer or other instruments used for
measuring hardness. This test method is an empirical test intended primarily for control purposes. No simple relationship exists between indentation hardness determined by this test
method and any fundamental property of the material tested.
This test method covers twelve types of rubber hardness measurement devices known as durometers: Types A, B, C, D, DO, E, M, O, OO, OOO, OOO-S, and R. The procedure for determining
indentation hardness of substances classified as thermoplastic elastomers, vulcanized (thermoset) rubber, elastomeric materials, cellular materials, gel-like materials, and some
plastics is also described.
All materials, instruments, or equipment used for the determination of mass, force, or dimension shall have traceability to the National Institute for Standards and Technology
by an accredited calibration lab for durometers.
In keeping with the worldwide demand for accredited calibrations, PTC Metrology™ has chosen A2LA as our accrediting body.
Click on the link to view our scope of our accreditation.
The Scope of PTC Metrology™ Accreditation
The scope of PTC®'s accreditation is intended to satisfy the traceability and other requirements for ongoing company operations, research requirements, and customer support for
durometer calibration to most if not all durometer standards worldwide. In the United States, A2LA and NVLAP have only accredited a handful of laboratories with a complete scope to
calibrate all the required aspects of durometer calibration ( see for example ASTM D2240 ). PTC Metrology™ is however, accredited for all durometer parameters.
Durometer Calibration
In durometer calibration this includes optical comparison for checking indenter geometry, load cells and duro calibrators for measuring the force curve, and gage blocks to check
indenter extension and gage linearity. This includes all attributes listed in ASTM D2240 and other international standards. PTC Metrology™ was A2LA accredited in March, 2002
(Cert # 1896.01)
Durometer Metrology
A2LA Accredited for Durometer Calibration PTC METROLOGY™ Uses NIST Traceable Standards and Meets the Requirements of:
- ISO/IEC Guide 17025
- ANSI/NCSL Z540-1
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