ISO 37:2011 Tensile Stress-Strain Properties of Rubber, Vulcanized or Thermoplastic
ISO 37:2011 describes a method for the determination of the tensile stress-strain properties of vulcanized and thermoplastic rubbers. The standard has two allowable specimen geometries. The standard describes straight dumbbell specimens as well as 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 which can meet or exceed the accuracy requirements of ISO 37. 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 and AutoX750 are more specifically suited for robust specimens
- Secure Gripping of Varying Specimens – Varying gripping techniques from Pneumatic Side Action Grips to Mechanical Self-tightening Grips to ensure no slippage occurs despite specimen thinning
- Reporting Calculations in Compliance with the Standard – Instron Bluehill testing software has advance pre-built methods available with pre-configured elastomer specific calculations helping
It is important to review ISO 37 in order to fully understand the test setup, procedure, and results requirements.
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 AutoX 750 is a high-resolution, long-travel automatic contacting extensometer. It can be mounted onto any electromechanical 3300, 5500, or 5900 table top and floor model systems, as well as LX, DX, HDX, and KN static hydraulic testing systems. It is well suited for applications involving plastics, metals, biomedical, composites, elastomers, and more. The AutoX has a maximum travel of 750 mm and accuracy of ± 1 µm.
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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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Instron® 2712-04x Series Pneumatic grips, packed with features to enhance gripping performance, usability, and operator safety.
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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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