Durometer Hardness Testing (ASTM D2240)

Durometer hardness testing is essential for evaluating a material’s resistance to localized deformation, offering crucial insights into material performance. At Cornerstone Materials Group (CMG), we provide precise durometer testing services to assess hardness for a variety of materials across different industries.

What is Durometer Hardness Testing?
Durometer hardness testing measures the resistance of materials like vulcanized rubber, thermoplastic elastomers (TPEs), and some plastics to indentation. It helps ensure materials are appropriately matched to their applications, although hardness does not directly equate to material durability or lifespan.

Applications of Durometer Hardness Testing
Durometer testing is key for industries including automotive, aerospace, medical devices, and consumer goods. It ensures optimal material performance in products such as seals, gaskets, and elastomeric components.

Understanding ASTM D2240
ASTM D2240 is the standard for durometer hardness testing, offering 12 different types suited to various materials. The key details include:

Sample Requirements: Minimum thickness is 0.24 inches, but thinner samples are also testable.
Test Procedure: The durometer is applied for about one second on a flat surface to determine hardness.
Consistency: Results depend on consistent application of pressure during testing.

Limitations of ASTM D2240
While versatile, ASTM D2240 is not suitable for coated fabrics or layered materials unless coatings are separated and meet thickness requirements. It also differs from ASTM D1415, which uses a rigid ball for hardness testing.

Why Choose CMG?
CMG provides tailored testing with: