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ASTM D412 Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers-Tension
Category:
Mechanical
ASTM D412 Standard Description
ASTM D412 Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers-Tension
ASTM D412 Standard Overview
From automotive tires to sealing strips, a wide range of applications for vulcanized rubber and thermoplastic elastomers rely on a key property: tensile strength. ASTM D412 is an authoritative test method for determining the tensile properties of these materials, including tensile strength, elongation at break and stress at specified elongation.
ASTM D412 Scope of Application
ASTM D412 applies to vulcanized thermoset rubber and thermoplastic elastomers. Common applications include automotive tires, seals, conveyor belts, shoe soles, waterproof membranes and flexible tubing.
ASTM D412 Thermosetting rubber & Thermoplastic elastomer (TPE)
Thermoset Rubber: Materials that are cured and permanently shaped through heat treatment. Curing is an irreversible chemical reaction that provides thermoset rubber products with improved strength and durability. Products made from thermoset rubber include tires, hockey pucks, circuit breakers, electrical equipment housings and motor components.
Thermoplastic Elastomers (TPE): Materials consisting of polymers, polymer blends or composites. For example, TPE pellets are typically heated into a molten state and then injected into molds, where they cool and solidify into the final shape. This process can be reversed by reheating the material. TPE applications include drive belts, shock absorbers, breathing tubes, catheters and shoe soles.
ASTM D412 Test Method
ASTM D412 determines tensile strength, stress at specified elongation, yield point and elongation at break by stretching unconditioned dumbbell, ring or straight specimens. It also evaluates permanent set after stretching and residual deformation after break. The specific test procedures are as follows:
(1) Tensile Stress/Strength Test
Dumbbell or straight specimens are symmetrically mounted in the grips and stretched at a rate of 500 ± 50 mm/min. The maximum force and elongation at break are recorded. If the strain at yield is below 20%, the test speed shall be reduced. Tensile strength and other performance values are calculated based on elongation at break and test data.
(2) Permanent Set After Tension Test
After mounting the specimen in the grips, it is stretched uniformly to the specified elongation within 15 seconds and held for 10 minutes. The specimen is then quickly released while avoiding recoil. After 10 minutes of free recovery, the distance between gauge marks is measured, and the permanent deformation is calculated based on the residual deformation ratio.
(3) Deformation After Break Test
After the specimen breaks, it is conditioned for 10 minutes. The fractured surfaces are carefully aligned, the distance between gauge marks is measured, and the residual deformation after break is calculated.
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