Durometer Hardness Shore Hardness ASTM D2240

Durometer 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.

Test Procedure:
The 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.

Specimen size:
The 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.

The 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.

**Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding. Due to copyright restrictions, we are not able to provide copies of standards. Standards can be obtained from appropriate standards authorities.

Related Links

royal blue and navy blue polymer beads

Polymers News and Events

NEW SERVICE: CircularAssure - Services to help you close the loop in the circular economy for plastics

ARTICLE: Processability and evaluation programmes for recycled plastic materials

ARTICLE:  Adhesives Quality Assurance Testing Programs

ARTICLE:  Enabling Polymer Non-Wovens Development

CASE STUDY: Polymer Surface Contamination Resolution

CASE STUDY: Polymer Failure - Distribution and Dispersion of Fillers


Contact Intertek