Purpose of Tensile Testing and Its Use in the Plastic Industry

May 30, 2018


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One of the most elementary tests that can be performed on a product is the tensile test to check the breaking resistance of a product. A test specimen is kept under tension to practice opposing forces acting upon opposite faces both located on the same axis that attempt to pull the specimen apart. These tests are simple to set and complete and reveal many characteristics of the products that are tested. These tests are measured to be fundamentally the reverse of a compression test.

Purpose of this test

Usually, this test is designed to run until the specimen breaks or fails under the specific load. The values that are calculated from this type of test can vary but are not limited to tensile strength, elongation, ultimate strength, modulus of electricity, yield strength, and strain hardening. The measurements taken during the test reveal the characteristics of a material while it is under a tensile load.

Tensile Testing for Plastics

Composites and Plastic are polymers with substances added to improve the performance or reduce costs. Plastic may be pressed or cast or extruded into sheet, film, or fibre reinforced plate, glass, tubes, fibre, bottles and boxes. Thermohardening or thermosetting plastics can be brittle or hard and temperature resistant. Thermosets include polyester resins, epoxy resins, polyurethane, phenolic resins, non-meltable, non-deformable and polyurethane. Polymers and plastics can be tested to measure product quality. The tests measure the weight required to split or break a plastic test material and sample elongation or stretch to that breaking load. The resulting data help to identify product quality and quality control checks for materials.

Plastic testing instruments, universal test machines provide a constant rate of extension because plastic tensile test behaviour is dependent on the speed of the test machine. The specimens loaded on the machines are set as per ASTM, DIN, ISO tensile test specimen dimensions. The Plastic tester machine should always rely on standard terms and conditions. As per ASTM D638, Plastic tensile test standards help to measure strain below 20 percent extension values. High strain can be measured by the machine, digital reader. Thin sheet sample testing is done as per the standard ASTM D882.

A high-quality testing machine is designed to measure the strength of a specific product, test method and product type. A good instrument can be the only solution required for your quality assurance and a worse choice can make you go in the loss too. So choose the instrument smartly.