ISO 604 Test Standard Explained

Compressive Properties - ISO 604

Compressive Modulus

The ratio of compressive stress to compressive strain in the linear region of the stress-strain curve between strain values of 0.05% and 0.25%. Compressive modulus is calculated using the formula:

E_c=(σ₂-σ₁)/(ε₂-ε₁)
where ε₁ is a strain of 0.0005,
ε₂ is a strain of 0.0025,
σ₁ is the stress at ε₁,
and σ₂ is the stress at ε₂.

Compressive Stress

The compressive stress carried by a test specimen at a specified strain during a compression test.

Testing is performed on either rectangular or cylindrical specimens. The specimen is placed between the platens of a universal testing machine and compressed at a constant rate of either 1 mm/min for modulus testing or strength testing of brittle materials, or 5 mm/min for strength testing of ductile materials. A stress-strain plot is used to extract the compressive strength and the compressive modulus.

Similar Standards

• ASTM D695

Property information for specific grades of resin are available in the Prospector Plastics Database.