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ASTM D6109 Flexural Test of Unreinforced and Reinforced Plastic Lumber

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


As Per ASTM D6109, "The 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


Flexural properties for any solid or hollow manufactured plastic lumber product of square, rectangular, round, or other geometric cross section that shows viscoelastic behavior. ASTM D6109 is used for evaluating the properties of plastic lumber as a product and not a material property test method. A specimen of rectangular cross section is tested in flexure as a beam either in a flat “plank” mode (Method A), or an edgewise “joist” mode (Method B).

By means of our plastic testing expertise and modular product design, we will help find the testing solution that is right for you. Give one of our application engineers a call today for help with creating the best budget and testing plan according to ASTM D6109. 


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. 

ASTM D6109 Flexural Test of Unreinforced and Reinforced Plastic LumberASTM D6109 Flexural Test of Unreinforced and Reinforced Plastic Lumber

ASTM D6109 Flexural Test of Unreinforced and Reinforced Plastic Lumber


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