ISO 527-2:2012 pdf download – Plastics – Determination of tensile properties
1 Scope
1.1 This part of ISO 527 specifes the test conditions for determining the tensile properties of moulding and extrusion plastics, based upon the general principles given in ISO 527-1.
1.2 The methods are selectively suitable for use with the following range of materials:
— rigid and semi-rigid thermoplastics moulding, extrusion and cast materials, including compounds flled and reinforced by, for example, short fbres, small rods, plates or granules but excluding textile fbres (see ISO 527-4 and ISO 527-5). See ISO 527-1:2012, Clause 3 for the defnition of “rigid” and “semi-rigid”.
— rigid and semi-rigid thermosetting moulding and cast materials, including flled and reinforced compounds but excluding textile fbres as reinforcement (see ISO 527-4 and ISO 527-5);
— thermotropic liquid crystal polymers.
The methods are not normally suitable for use with rigid cellular materials or sandwich structures containing cellular material. For rigid cellular materials see ISO 1926.
The methods are not suitable for fexible flms and sheets, of thickness smaller than 1 mm, see ISO 527-3.
1.3 The methods are applied using specimens which may be either moulded to the chosen dimensions or machined, cut or punched from injection- or compression-moulded plates. The multipurpose test specimen is preferred (see ISO 20753).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 293, Plastics — Compression moulding of test specimens of thermoplastic materials
ISO 294-1, Plastics — Injection moulding of test specimens of thermoplastic materials — Part 1: General principles, and moulding of multipurpose and bar test specimens
ISO 295, Plastics — Compression moulding of test specimens of thermosetting materials
ISO 527-1:2012, Plastics — Determination of tensile properties — Part 1: General principles
ISO 2818, Plastics — Preparation of test specimens by machining
ISO 10724-1, Plastics — Injection moulding of test specimens of thermosetting powder moulding compounds (PMCs) — Part 1: General principles and moulding of multipurpose test specimens
ISO 11403-3, Plastics — Acquisition and presentation of comparable multipoint data — Part 3: Environmental infuences on properties
ISO 20753, Plastics — Test specimens
5.2 Extensometer
For this part of ISO 527, a gauge length of 75 mm is preferred when a multipurpose test specimen is used. A gauge length of 50 mm is also acceptable for quality-control purposes or where specifed. If strains are recorded only on one side of the test specimen, ensure that low strains are not falsifed by bending, which may result from even faint misalignment and initial warpage of the test specimen and which generates strain differences between opposite surfaces of the test specimen. NOTE Increasing the gauge length leads to higher accuracy, especially for the modulus determination. The absolute accuracy of the measurement of elongation required for a ±1 % accuracy of modulus determination is ±1,5 µm. This is less severe than the ±1 µm needed if a gauge length of 50 mm is used. Furthermore, necking outside of the gauge length will be less frequent.