ASTM D624 – Standard Test Method for Tear Strength of Conventional Vulcanized Rubber and Thermoplastic Elastomers
ASTM D624 measures tear strength: the force it takes to propagate a tear through a rubber or thermoplastic elastomer specimen once a nick exists. A standard-shaped specimen, with a precisely placed starting point, is pulled until the tear runs through. The reported number is that force divided by the specimen thickness – a higher number means more resistance to tearing.
Tear strength and tensile strength are different numbers: a compound can pull hard and still tear easily once a nick exists. If your part sees sharp edges, flexing, or abrasion, name the tear test and the target on your RFQ, not just tensile.
Short: A nick this small decides if your rubber part survives – ASTM D624 tear test
Illustrative visuals in this video are AI-generated.
Watch short explainers on rubber and plastic tests in our Rubber Testing Video Library. For the pull-strength counterpart, see the ASTM D412 rubber tensile test.
Need custom molded rubber or plastic parts tested to this standard? Send your drawing and requirements to estimator@coirubber.com or contact our team. COi Rubber is US owned and operated, and our Wuhu, China manufacturing facility is IATF 16949 certified.