1 Scope
This standard specifies a method for determining the compressive properties of plastics under defined conditions. A standard test specimen is defined but its length may be adjusted to prevent buckling under load from affecting the results. A range of test speeds is included.
This standard is used to investigate the compressive behaviour of the test specimens and for determining the compressive strength, compressive modulus and other aspects of the compressive stress/strain relationship under the conditions defined.
This standard is applicable to the following range of materials:
— rigid and semi-rigid thermoplastic moulding and extrusion materials, including compounds filled and reinforced by e.g. short fibres, small rods, plates or granules in addition to unfilled types; rigid and semi-rigid thermoplastic sheet;
— rigid and semi-rigid thermoset moulding materials, including filled and reinforced compounds; rigid and semi-rigid thermoset sheet;
— thermotropic liquid-crystal polymers.
In agreement with ISO 10350-1:1998 and GB/T 19467.2-2004, this standard applies to fibre-reinforced compounds with fibre lengths ≤7.5 mm prior to processing.
This standard is not normally suitable for use with materials reinforced by textile fibres, fibre-reinforced plastic composites and laminates, rigid cellular materials or sandwich structures containing cellular material or rubber.
This standard is performed using specimens which may be moulded to the chosen dimensions, machined from the central portion of a standard multipurpose test specimen (see GB/T 11997-2008) or machined from finished or semi-finished products such as mouldings or extruded or cast sheet.
This standard specifies preferred dimensions for the test specimen. Tests which are carried out on specimens of different dimensions, or on specimens which are prepared under different conditions, may produce results which are not comparable. Other factors, such as the test speed and the conditioning of the specimens, can also influence the results. Consequently, when comparable data are required, these factors must be carefully controlled and recorded.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 2918-1998 Plastics — Standard Atmospheres for Conditioning and Testing (idt ISO 291:1997)
GBT 5471-2008 Plastics — Compression Moulding of Test Specimens of Thermosetting Materials (ISO 295:2004, IDT)
GB/T 9352-2008 Plastic — Compression Moulding of Test Specimens of Thermoplastic Materials (ISO 293:2004, IDT)
GB/T 11997-2008 Plastic — Multipurpose Test Specimens (ISO 3167:2002, IDT)
GB/T 17037.1-1997 Injection Moulding of Test Specimens of Thermoplastic Materials — Part 1: General Principles and Moulding of Multipurpose and Bar Test Specimens (idt ISO 294-1:1996)
GB/T 17200-1997 Requirements for Tensile, Flexural and Compression Testing Machines for Rubbers and Plastics (idt ISO 5893:1993)
GB/T 19467.2-2004 Plastics — Acquisition and Presentation of Comparable Single-point Data — Part 2: Long-fibre-reinforced Plastics (ISO 10350-2:2001, IDT)
ISO 2602:1980 Statistical Interpretation of Test Results — Estimation of the Mean — Confidence Interval
Foreword I
1 Scope
2 Normative References
3 Terms and Definitions
4 Principle
5 Apparatus
6 Test Specimens
7 Number of Test Specimens
8 Conditioning of Test Specimens
9 Test Procedure
10 Calculation and Expression of Results
11 Precision
12 Test Report
Annex A (Normative) Small Test Specimens
Annex B (Informative) Limits of Buckling
Annex C (Normative) Compliance Correction
Bibliography
