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The Gibitre Instruments mechanical extensometer is an accessory designed to be attached to the Tensor_Check dynamometer for the accurate measurement of elongation in rubber and plastic specimens. Designed for tensile testing of polymeric materials, it allows for the direct and reliable detection of specimen deformation during the test, providing the essential parameter for evaluating tensile behavior.
Compliance with key industry standards—ISO 37, ISO 527, ASTM D412, and ASTM D638—ensures that results are obtained according to recognized standards and are therefore easily comparable across materials and laboratories. This makes the instrument the natural choice for those who wish to integrate their Tensor_Check with a measurement solution aligned with regulatory requirements, avoiding inconsistent interpretations or methods.
Why buy it:
- Direct integration with Tensor_Check
- Accurate measurement of elongation in rubber and plastic specimens and results consistent with international standards
- Self-tightening clamps with adjustable pressure to ensure continuous contact with the specimen without slippage
- Calibration accredited according to ISO 9513 and ISO 5893
An essential solution for those who use material testing instruments and require comparable and traceable data in tensile tests.
The differential strain gauge is necessary for the execution of elongation tests on Rubber and Plastic specimens. The device allows measuring the elongation of the linear part of the specimen according to the provisions of the standards (see ISO 37, ISO 527, ASTM D 412, ASTM D 638)
The extensometer produced by Gibitre has been specifically developed for testing rubber and elastomers taking into consideration:
• the high elongation that can reach rubber and thermoplastic specimens
• the mechanical strength needed to absorb the energy transmitted to the device when the specimen breaks
• the need to easily change the distance between the clamps (reference length) according to the type of specimen
• the need to adjust the closing force of the tweezers at the base to the type of material to be tested.
The device has two tweezers with an initial distance (reference lenght L0) defined by the standard for the type of specimen in use. The tweezers are attached to the linear portion of the specimen to measure its percentage elongation, with respect to the reference lenght, during the test.
The device complies with the requirements of ISO 5893.
The distance between the terminals of the strain gauge can be changed in a few seconds by screwing the required spacer into the appropriate hole in the upper strain gauge.
Spacers for 10mm, 20mm, 25mm and 50mm are supplied, together with the device. Different spacers can be supplied on request.
The spacers are calibrated and the actual distance obtained between the terminals is documented in the Calibration Report supplied with the instrument.
In addition, the construction methods of the Gibitre strain gauge allow the customer to simply check the distance between the clamps using standard flat-parallel blocks.
The standard supply of the device includes contact points of the tweezers made of stainless steel. The radius at the point of contact with the specimen has been optimized to prevent slipping during the test while avoiding the risk of scoring the specimen at the contact point.
For materials with very low hardness, expanded materials or products with very slippery surface, additional grips with rubberized contact points can be provided.
To carry out tests that do not require the use of the strain gauge, it is possible to rotate the entire strain gauge holder towards the back of the instrument and lock it in the rest position. In this way, you can use the entire light between the columns of the instrument to carry out tests even on large pieces.
