ASTM D3574 is a commonly used standard for tests involving flexible cellular foam materials. Section C specifies a method for measuring the compression force necessary to produce a 50% deflection over the entire top surface of the foam test specimen. This analysis will help to better characterize and compare various foams and determine their ideal applications. This test is very similar to ISO 3386, but with slight technical differences that prohibit a direct comparison.
A universal tensile testing machine with a flat compression foot is needed to complete the test procedures. Before conducting ASTM D3574 C, it is important to read the entire specification in the relevant ASTM publication.