ASTM D1621 Plastics and Elastomers Compression Test Standard

The ASTM D1621 standard, published by the American Society for Testing and Materials (ASTM), is a test method used to determine the compression properties of rigid cellular materials, particularly expanded plastics. Calculations that can be obtained from this method include compressive strength, compressive strain, compressive stress, and Modulus of Elasticity.

To perform this test, a universal testing machine capable of performing a compression test at a constant crosshead speed with sufficient force capacity to compress the specimen to 13% of its height is required.

ASTM D1621 Test Procedure

ASTM D1621 testing should be performed on at least five specimens, each at a minimum height of 1 inch for each specimen. Start the crosshead at a displacement rate of 25,4 to 1 mm [2,5 to 0,25 inch]/min per 0,1 mm [0,01 inch] sample thickness. Continue until the sample reaches a yield point or is compressed to approximately 13% of the original thickness, whichever comes first.

A testing machine for compression testing of plastics or foams must be versatile and accurate. ASTM D1621 requires results within 1% accuracy. The machine must contain both a fixed and a movable element and contain clamping plates. The plates should be larger than the sample with a spherical top plate and a drive system to impart a controlled speed to the moving crosshead.

Our organization also provides testing services within the scope of ASTM D1621 plastics and elastomers compression test standard, within the framework of laboratory testing services.