ISO 527 - Tensile Test of Plastics Composites

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ISO 527-1 Tensile Test of Plastics Composites

ISO 527-1 covers the test procedures for determining tensile properties of plastics and plastic composites. Tensile properties of plastics that are determined through the practices of ISO 527-1 include tensile strength, tensile modulus and other properties related to stress strain characteristics of plastic materials.

The test methods of ISO 527-1 can be used to test a wide variety of plastic materials, including:

  • Thermoplastics for molding and extruding.
  • Thermosetting molding materials
  • Fiber reinforced thermoset and thermoplastics composites
  • Thermotropic liquid crystal polymers

According to ISO 527-1, tensile testing of plastics is executed by pulling a test specimen along a major longitudinal axis at a constant rate of extension until failure of the plastic specimen occurs or until a predetermined stress or strain value. ISO 527-1 requires stress and strain measurements to be recorded through the plastic tensile test.

Plastic tensile test specimens are to be used to testing in accordance to ISO 527-1. Plastic components are not tested with the practices of ISO 527-1. The purpose of ISO 527-1 is to determine tensile properties of plastics, and not to determine stress behavior of plastic components.

ISO 527-2 Tensile Test of Moulding and Extrusion Plastics

ISO 527-2 specifies the test conditions for determining the tensile properties of moulding and extrusion plastics, based upon the general principles given in ISO 527-1.The methods described in ISO 527-2 are selectively suitable for use with the following range of materials: rigid and semi-rigid thermoplastics moulding, extrusion and cast materials, including compounds filled and reinforced by, for example, short fibres, small rods, plates or granules but excluding textile fibres (see ISO 527-4 and ISO 527-5).

See ISO 527-1:2012, Clause 3 for the definition of "rigid" and "semi-rigid". Rigid and semi-rigid thermosetting moulding and cast materials, including filled and reinforced compounds but excluding textile fibres as reinforcement (see ISO 527-4 and ISO 527-5); thermotropic liquid crystal polymers. ISO 527-1 requires a universal test machine configured for tensile-testing with testing speeds of 1-500 mm/min.

ISO 527-3 Tensile Test of Plastic Thin Film Sheet

ISO 527-3 covers the specimen preparation requirements of thin plastic sheets and films. Thin plastic specimens created with the practices of ISO 527-3 are tensile tested with the practices of ISO 527-1. Thin plastic specimens created in accordance with ISO 527-3 are cut, or punched from a sheet of thin plastic.

ISO 527-3 specifies that thin plastic film of sheet specimens must be free from cracks or scratches that will affect the tensile test. ISO 527-3 allows for four specimen geometries that can be used for tensile testing. There are three acceptable dogobone shaped specimens that are acceptable. Specimen created following ISO 527-3 can be used to determine the tensile properties of thin plastic sheets and films including the tensile modulus of elasticity and the tensile energy to break (TEB).

ISO 527-4 Tensile Test of Plastic Composites & Thin Film Sheet

ISO 527-4 determines the tensile properties of isotropic and orthotropic fiber reinforced plastic composite sheeting and film including the tensile strength and modulus of elasticity, strain, elongation and the tensile energy to break (TEB). ISO 527-4 specifically describes the test conditions for tensile testing isotropic and orthotropic fiber-reinforced plastic composites. Plastic tensile procedures for ISO 527-4 are defined in ISO 527-1, which is the ISO standard test method for plastic tensile testing.

Specimen shape and dimensions for tensile testing fiber reinforced plastic composites is defined in ISO 527-4. In general, the plastic specimen shape defined by ISO 527-4 is a dogbone shape. Plastic composite testing machines for testing plastic composites must meet the requirements of ISO 527-1. According to ISO 527-1 the basic requirements for a plastic test machine that is that the machine is capable of constant rate of extension, and equipped with a load cell, and extensometer.

ISO 527-5 Tensile Test of Unidirectional Fiber Reinforced Plastic Composites

The purpose of ISO 527-5 is to define the testing conditions, and specimen geometry for tensile testing unidirectional fiber reinforced plastic composites. Unidirectional fiber reinforced plastic composites materials include fiber glass, carbon fiber, aramid fiber, and other similar unidirectional fiber reinforced plastic composites. Multidirectional fiber reinforced plastic composites should be tested with the specifications of ISO 527-4.

The unidirectional fiber reinforced plastic composites testing machine used for ISO 527-5 must meet the specifications of ISO 527-1. This includes a plastic composite tester that is capable of constant rate of extension and is fitted with a force gage and extensometer.