CEN/TC 249/SC 1/WG 3 - Mechanical properties and preparation of test specimens

This document specifies a bending-vibration method based upon resonance curves for determining the flexural complex modulus E*f of homogeneous plastics and the damping properties of laminated plastics intended for acoustic insulation, for example systems consisting of a metal sheet coated with a damping plastic layer, or sandwich systems consisting of two sheet-metal layers with an intermediate plastic layer. For many purposes, it is useful to determine these properties as a function of temperature and frequency.

This document establishes the general principles and procedures to be followed when machining and notching test specimens from compression-moulded and injection-moulded plastics, extruded sheets, plates and partially finished or wholly finished products.
In order to establish a basis for reproducible machining and notching conditions, the following general standardized conditions are applied. It is assumed, however, that the exact procedures used are selected or specified by the relevant material specification or by the standards on the particular test methods. If sufficiently detailed procedures are not thus specified, the interested parties agree upon the conditions to be used.

This document specifies a four-cavity mould, the type С ISO mould, for the injection moulding of small tensile bars measuring ≥ 60 mm × 10 mm × 3 mm (the type CW11 test specimen in ISO 20753).

1.1    This document specifies the conditions for determining the tensile properties of plastic films or sheets less than 1 mm thick, based upon the general principles given in ISO 527-1.
NOTE       For sheets greater than 1 mm thick, the user is referred to ISO 527-2.
1.2    See ISO 527-1:2012, 1.2.
1.3    This document is not normally suitable for determining the tensile properties of
a)    cellular materials, and
b)    plastics reinforced by textile fibres.
1.4    See ISO 527-1:2012, 1.3.

Specifies a bending-vibration method based upon resonance curves for determining the flexural complex modulus of homogeneous plastics and the damping properties of laminated plastics intended for acoustic insulation.

Cancels and replaces the second edition (1980). Establishes the general principles and procedures to be followed when machining and notching test specimens from compression-moulded and injection-moulded plastics, extruded sheets, plates and partially finished or wholly finished products.

Specifies a four-cavity mould, the type C, for the injection moulding of small tensile bars measuring >= 60 mm × 10 mm × 3 mm. Replaces the second edition of ISO 294.

Specifies the conditions for determining the tensile properties of plastics films or sheets less than 1 mm thick, based upon the general principles given in part 1. Cancels and replaces ISO/R 527:19966 as well as ISO 1184:1983, of which it constitutes a technical revision.

Contains the general principles to be followed for the preparation of injection moulding test specimens of thermoplastics and gives details of mould design for preparing multipurpose test specimens as specified in ISO 3167 and tensile bars. Replaces the second edition of ISO 294.

The methods specified are selectively suitable for use with the following range of materials: rigid and semirigid thermoplastics moulding, extrusion and cast materials, including compounds filled and reinforced by e.g. short fibres, small rods, plates or granules but excluding textile fibres in addition to unfilled types, rigid and semirigid thermosetting moulding and cast naterials, including filled and reinforced compounds but excluding textile fibres as reinforcement, and thermotropic liquid crystal polymers.

Several different types of test specimen are defined to suit different types of material. The methods specified are selectively suitable for use with the following range of materials: rigid and semirigid thermoplastics moulding, including filled and reinforced compounds in addition to unfilled types, sheets and films, rigid and semirigid thermosetting moulding naterials including filled and reinforced compounds, and sheets including laminates, as well as fibre-reinforced thermoset and thermoplastics composites.

Gives geometrical configuration of the rigid precision coaxial line and the provision mounting connectors.