ASTM D6109 – Standard Test Methods for Flexural Properties of Unreinforced and Reinforced Plastic Lumber and Related Products

As Per ASTM D6109, "These test methods are suitable for determining the flexural properties for any solid or hollow manufactured plastic lumber product of square, rectangular, round, or other geometric cross section that shows viscoelastic behavior. The test specimens are whole "as manufactured" pieces without any altering or machining of surfaces beyond cutting to length. As such, this is a test method for evaluating the properties of plastic lumber as a product and not a material property test method. Flexural strength cannot be determined for those products that do not break or that do not fail in the extreme outer fiber."

Applicable Products: Plastic lumber products

4 Points bending test/Flexural test

Span: 16 times of the sample thickness.

Loading nose and supports: Radius min. 12.7mm . If the loading indentions is significant then radius increase upto max. 1.5 times of the depth.