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Video extensometry and pneumatic grips with rubber faces the same width of the specimen should be used in tensile testing of delicate plastic films and sheets.
When measuring modulus and strain of plastics, use an extensometer that provides high accuracy and has an acceptable gauge length and travel.
The strength, strain at failure, and modulus from isotropic and orthotropic fiber-reinforced plastic composites are tensile tested, following ISO 527.
Fiber-reinforced composites used in the aerospace, automotive, and energy industries should undergo flexural testing to determine material strength and flexibility.
/detail2---autox-plastics-iso-527-and-astm-d638.jpg "ISO 527-2:2012 Tensile Properties of Plastics")
