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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 the area of quality control, the development of properties over time and compliance with specified tolerances are the essential evaluation standards.
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Important tests in the characterization of molding materials

Tensile test to ISO 527

ISO 527-1, ISO 527-2
The tensile test on plastics to ISO 527-1 and ISO 527-2 yields essential mechanical properties, including tensile stress, strain, tensile modulus, yield point, point of break and Poisson’s ratio.
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Impact tests

Among others, ISO 179, ASTM D6110, ISO 180, ASTM D256
Here you will find, among other things, information on Charpy test (ISO 179-1), instrumented Charpy test (ISO 179-2), Izod test (ISO 180), tensile impact test (ISO 8256), puncture test (ISO 6603-2).
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3-Point Flexure Test ISO 178

The 3-point flexure tests to ISO 178 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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Quasi-static tests

Tensile test to ISO 527

ISO 527-1, ISO 527-2
The tensile test on plastics to ISO 527-1 and ISO 527-2 yields essential mechanical properties, including tensile stress, strain, tensile modulus, yield point, point of break and Poisson’s ratio.
to Tensile test to ISO 527

Tensile properties ASTM D638

The tensile test on plastics to ASTM D638 yields essential mechanical properties, including tensile stress, strain, tensile modulus, yield point, point of break and Poisson’s ratio.In this process, essential mechanical properties of a molding material or a specimen taken from a defined area on a component are determined.
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3-Point Flexure Test ISO 178

The 3-point flexure tests to ISO 178 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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3-point flexure test ASTM D790

The ASTM D790 standard describes 3-point flexure tests on rigid and semi-rigid plastics as well as fiber composites with long-fiber reinforcements.
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Tests at increased and high strain rates

Charpy impact and notched impact strength ISO 179-1 & ISO 179-2

The standards ISO 179-1 (non-instrumented impact strength test) and ISO 179-2 (instrumented impact strength test) describe the impact test to Charpy for determination of the impact and notched impact strength of plastics.
to Charpy impact and notched impact strength ISO 179-1 & ISO 179-2

Izod notched impact strength ASTM D256

Within the scope of ASTM, the notched impact strength of plastics is normally measured using the Izod test to ASTM D256.The flexural impact stress is applied to a notched specimen that is gripped on one side.The result is presented as the thickness-related energy absorption of the specimen.
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Izod impact and notched impact strength ISO 180

The ISO 180 standard describes the Izod impact test on plastics for determination of the impact and notched impact strength.
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Tensile impact tests to ISO 8256, ASTM D1822

Tensile impact tests on plastics provide a material property based on the impact energy, which is determined under tensile loading on standardized specimens at high strain rates.When using the same pairings of pendulum and yoke sizes, the result is a good level of reproducibility of the test results.
to Tensile impact tests to ISO 8256, ASTM D1822

Tensile tests at high strain rates

The measurement of stress-strain curves under high strain rates provides data for crash simulations, for example in vehicle construction.
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Puncture tests on test plates

In a puncture test, the impact strength of a polymer is determined under increased strain rates and a multiaxial stress state.
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Creep tests

Creep test

To ISO 899-1, ISO 899-2, ASTM D2990, ISO 16770
Creep tests on plastics:Often run over a period of 1,000 hours, the test records the strain of the specimen to demonstrate its long-term behavior.
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Rheological and thermal properties, hardness

Melt flow index test

ISO 1133-1, ISO 1133-2
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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Automation

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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The ZwickRoell Polymer Testing Lab

ZwickRoell supplies all types of equipment needed for the mechanical testing of plastics. This includes equipment to determine static, dynamic and high-speed properties such as tensile, flexural, compression and shear, as well as creep machines for the long-term application of force or strain, instruments to measure impact properties, such as conventional Charpy, Izod and tensile-impact.
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