Overview
ISO 1268-9:2003 outlines standardized methods for producing test plates through the compression moulding of Glass-fibre Mat reinforced Thermoplastic sheets (GMT) and Sheet Thermoplastic Composites (STC). This international standard provides a precise procedure for preparing test specimens to evaluate the mechanical and physical properties of fibre-reinforced thermoplastic laminates. It applies broadly to laminates reinforced with glass, carbon, aramid, or other fibre types, either alone or in combinations, suitable for compression moulding processes.
ISO 1268-9:2003 is part of the ISO 1268 series and complements ISO 1268-1 which covers general conditions for producing test plates. This standard is essential for manufacturers, researchers, and testing laboratories involved in composite materials, ensuring consistent and reliable test plate fabrication for material characterization and quality assurance.
Key Topics
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Scope and Application
The method applies to the compression moulding of reinforced thermoplastic sheets designed to flow during processing. It covers various fibre reinforcements (glass, carbon, aramid) and thermoplastic matrices, enabling testing under unified conditions.
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Materials and Reinforcement
Includes GMT/STC materials with uniform reinforcement content and orientation in the moulding plane. It addresses unidirectional and randomly oriented reinforcements and provides guidance on stacking sequences for multilayer configurations.
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Moulding Procedure
Utilizes a hydraulic press with specific closing speed and pressure parameters (>14 MPa) to compress heated blanks into moulds, ensuring complete cavity filling. Preheating steps are critical to avoid polymer degradation, with mould temperatures maintained around 60°C.
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Plate Dimensions and Usable Area
Test plates should have a surface area typically of at least 200 mm × 200 mm and a thickness of 4 mm ± 0.2 mm. The usable central area accounts for avoiding fibre orientation inconsistencies near plate edges, guiding specimen cutting for standard mechanical tests.
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Equipment Requirements
Specifies the use of temperature-controlled plate moulds, ovens capable of uniform heating, and hydraulic presses capable of the necessary clamping force and speed to maintain process repeatability.
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Test Plate Verification
Includes assessments of fibre content according to ISO 1172 and visual inspections for void content to ensure quality and compliance before mechanical testing.
Applications
ISO 1268-9:2003 is essential for industries and laboratories involved in:
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Composite Material Testing
Producing reliable test specimens for mechanical, thermal, and physical property evaluation of GMT/STC laminates.
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Quality Control
Ensuring consistent test plate production for validating batch-to-batch variability and compliance with customer or regulatory specifications.
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Research and Development
Facilitating comparative studies on new fibre-reinforced thermoplastic formulations, fibre orientations, and manufacturing parameters.
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Automotive and Aerospace
Standardizing test plates for components manufactured from fibre-reinforced thermoplastics, where lightweight, strength, and durability are critical.
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Material Certification
Supporting certification processes requiring verified mechanical testing of fibre-reinforced plastic composites.
Related Standards
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ISO 1268 Series
- Part 1: General conditions for producing test plates
- Part 4: Moulding of prepregs
- Other parts addressing different moulding methods such as spray-up, filament winding, pultrusion, and injection moulding.
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ISO 527-4
- Specifies tensile test methods and conditions for isotropic and orthotropic fibre-reinforced plastics.
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ISO 1172
- Outlines determination methods for textile-glass and mineral-filler content in composites via calcination.
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ISO 1268-1
- Covers general conditions applicable when producing test plates including health and safety considerations, reporting, and terminology.
Keywords: ISO 1268-9, GMT/STC, compression moulding, fibre-reinforced plastics, thermoplastic composites, test plates, mechanical properties, glass fibre reinforced thermoplastics, composite materials testing, standard test specimen preparation, ISO fibre-reinforced plastics standards.
Open preview (PDF)Fibre-reinforced plastics — Methods of producing test plates — Part 9: Moulding of GMT/STC