ASTM D412-2015 Tension Test for Rubber and Elastomers
ASTM D412-2015 describes a method for determining the tensile stress-strain properties of vulcanized and thermoplastic rubbers. The standard has two methods, A and B, depending on the specimen geometry being tested. Method A refers to the use of dumbbell shaped specimens, while method B refers to ring shaped specimens. The properties which can be determined are tensile strength, elongation at break, stress at a given elongation, and yield point. The measurement of stress and strain at yield applies only to some thermoplastic rubbers and certain other compounds.
The challenges of testing to this standard are:
- Accurate strain measurement at high elongations
- Secure gripping of varying specimens
- Reporting calculations in compliance with the standard
- Accurate Strain Measurement – Advanced strain solutions for contacting and non-contacting strain measurement. While extensometers are not required by the standard, a strain measurement is recommended for the most accurate and repeatable results. A non-contacting solution like the Standard Video Extensometer (SVE 2) is ideal for all specimen types while contacting solutions such as the XL long travel extensometer is more specifically suited for robust specimens.
- Secure Gripping of Varying Specimens – Varying gripping options, including pneumatic side action grips and mechanical self-tightening grips, ensure no slippage occurs despite specimen thinning. The O-ring fixture is designed specifically to comply with method B of the standard.
- Reporting Calculations in Compliance with the Standard – Instron Bluehill® testing software has advanced pre-built methods available with pre-configured elastomer specific calculations.
The second generation, Standard Advanced Video Extensometer, SVE 2, is a high-performance, non-contacting extensometer that is ideally suited for everyday applications such as rubber, soft plastics,elastomers and other materials with high strain to failure. It can also be used for testing in both ambient and non-ambient temperature conditions.
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The Instron® model XL (long travel) extensometer is a precise device for measuring strain in highly extensible materials such as elastomers, semi-rigid plastics and films.
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Catalog number 2712-013 Rated capacity 5 N (0.500 kgf, 1 lbf)
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Catalog number 2713-001 Rated capacity 1 kN (100 kgf, 225 lbf) Ideal for testing elastomers, flexible plastics and thin films. Temperature range: -20 °C to 150 °C (-4 °F to 300 °F)
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The Bluehill 3 Elastomers Application Module includes a collection of pre-configured test methods and supporting documentation that cover a variety of internationally recognized industry standards; such as ISO 813, ISO 34-1, ISO 37, ASTM D412, ASTM D413, ASTM D1414, and more.
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Bluehill 3 testing software is designed to meet the demands of any level of user. Only version updates are available at this time.
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5900 Universal Testing Systems are engineered for precision, built for durability, and offer the flexibility for changing requirements. They are designed with standard and optional features that increase testing efficiency and improve the testing experience for the operator. A wide range of models are available for testing capacities from < 100N up to 600kN.
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Instron 3300 Series Universal Testing Systems for Tensile, Compression, Bend, and other material property tests.
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