The test specimen Type IV is ideal for testing of very soft polymers (e.g., rubber) and is used when comparing soft and more stiff polymers.įorce and extension are the two fundamental values measured by a testing machine.For sheet thickness of more than 14 mm, the thickness is adjusted through mechanical processing. Here, the width of the narrow parallel section, as well as the shoulder width and the overall length are increased so that the specimen thickness remains less than the width. If specimens with material thicknesses of more than 7 mm can be obtained through mechanical processing, then specimen Type III is used.If only a small amount of material is available, or if removal from a component does not allow for a larger specimen, then a specimen Type V is used, which is reduced in every dimension relative to Type I.Provided that by using the test specimen Type I a fracture cannot be produced in the narrow parallel part of the specimen, ASTM D638 recommends the use of a test specimen Type II, in which the width of the narrow parallel section is significantly reduced.The preferred test specimen is the dumbbell Type I, which with a thickness of 3.2 mm (1/8 inch) and a gauge length of 50 mm (2 inches) is still relatively similar to common component material thicknesses and at the same time allows for good strain measurement accuracy.Consultation and Application Technology.Specimen preparation and dimensional measurement.Extensometers for Compression, Flexure and Components Testing. Electromechanical static testing machines.Analog and Digital Hardness Testers to Shore.Extrusion Plastometers / Melt Flow Index Testers.Testing Machine for Tubular Biomaterials.Biaxial Testing Machine for Biomaterials.Materials testing machines with torsion drive.Electromechanical Servo Testing Actuators.Testing machine for high test loads (E-series).Intermediate products and finished parts.Thermoplastics and thermosetting molding materials.
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