Tensile Test Methods for Plastics: ASTM D638

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Resin materials (plastics) are found in a wide variety of items used on a daily basis. Recently, plastics have started to be used as structural materials in transportation equipment, such as automobiles and aircraft, due to their strength and light-weight nature. In these applications, it is important to understand the mechanical strength properties of these plastics. ASTM D638 specifies methods for testing the tensile strength of plastics and other resin materials and for calculating their mechanical properties, and outlines accuracy requirements for the test frames and accessories used.

Tensile Test Methods for Plastics: ASTM D638

Features

Test force accuracy of ±1%

ASTM D638 requires a test force accuracy that meets ASTM E4 Class 1, accuracy within ±1% of the indicated test force. Shimadzu’s AG-X plus series, AGS-X series, and EZ-X series test frames and load cells all meet the test force accuracy requirements for ASTM D638.
Elongation measurements with 10 μm absolute accuracy and ±0.5% relative accuracy

Specimens for ASTM D638 are dumbbell-shaped with either a 25 mm or 50 mm gauge length; a 50 mm gauge length is recommended.

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