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Thermoplastics and thermosetting molding materials

  • A key aspect of the characterization of molding materials is the inter-laboratory reproducibility of test results.
  • Specimen production, specimen shapes, and test sequences are all specified in detail,
  • with rigorous demands on both repeatability and traceability.
  • In quality control, the basic standard of evaluation is the change in measured values over a period of time.
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Important tests in the characterization of molding materials

3-Point Flexure Tests

ISO 178
The 3-point flexure tests described in ISO 178 and ASTM D790, demonstrate classic characterization methods for rigid and semi-rigid plastics. Typical test results include the flexural modulus, stress at 3.5% elongation, stresses and elongations at the yield point and at specimen break.
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Melt flow index test

ISO 1133
Determination of the melt mass flow rate (MFR) and melt volume flow rate (MVR) of filled and unfilled thermoplastics to ISO 1133-1 and -2, ASTM D1238. and other similar standards.
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Determination of HDT VST

Among others, ISO 306, ASTM D1525, ISO 75, ASTM D648
Determination of heat deflection temperature (HDT) and Vicat softening temperature (VST) to ISO 306, ASTM D1525, ISO 75, ASTM D648
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Hardness Testing

ISO 7619-1, ISO 868, ASTM D2240, ISO 2039-1/-2, ASTM D785, ISO 19278
There are a variety of methods used to test hardness in the plastics industry. The following are described here: Ball indentation hardness: ISO 2039-1, Rockwell hardness: ISO 2039-2, ASTM D785, instrumented hardness testing: ISO 14577-1, Shore hardness: ISO 868, ASTM D2240, ISO 7619
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Creep tests

ISO 899-1, ISO 899-2, ASTM D2990, ISO 16770
Creep tests: Often run over a period of 1,000 hours; records the strain of the specimen to demonstrate the long-term behavior
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Automation of plastic molding materials testing reduces the statistical scatter of test results. ZwickRoell offers the right automated testing systems for this application.
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