ISO 14526-3:1999

Overview

ISO 14526-3:1999 specifies requirements for selected phenolic powder moulding compounds (PF‑PMCs) used to produce compression- or injection‑moulded test specimens. The standard focuses on PF‑PMC types whose composition and properties differ significantly and are of general technical or economic importance. It defines which physical and chemical properties must be met, how materials are designated, and refers to ISO 14526‑2 for test specimen preparation and test methods.

Key topics and technical requirements

• Scope of materials: Limited to PF‑PMCs with distinctly different compositions and commercially relevant types; filler/reinforcement nature, form and mass content are defined in the compound designation (see ISO 14526‑1).
• Property classes: Requirements are organized by compound type (Tables 1–3) based on filler combinations such as wood+mineral, glass fibre+mineral, fillers like LF, SC, SS, PF, GF, GG, MD, WD.
• Mechanical properties: Examples include stress at break, flexural strength and Charpy impact (unnotched and notched). Tables give mean value limits and allowable variation for individual test specimens.
• Thermal properties: Deflection temperatures under specified loads (T1,8 and T8,0) and flammability classification (glow bar / BH).
• Electrical properties: Dissipation factor (tan δ), volume and surface resistivity, and proof tracking index (PTI).
• Other properties: Water absorption (W24) and limits for free ammonia where applicable.
• Rheology and processing: No fixed limits are imposed; appropriate rheological and processing properties must be agreed between parties to ensure satisfactory moulding performance.
• Testing and designation: Test methods and conditions are taken from ISO 14526‑2; compound types use the designation system in ISO 14526‑1.

Applications and practical value

ISO 14526‑3 is used to:

• Specify material acceptance criteria for phenolic powder moulding compounds in product specifications.
• Ensure consistent mechanical, thermal and electrical performance in components made by compression or injection moulding.
• Support procurement, quality control and material selection for parts requiring heat resistance, electrical insulation and dimensional stability. Typical stakeholders include moulders, compound manufacturers, material engineers, product designers and quality assurance teams working with thermosetting phenolic moulding powders.

Who should use this standard

• Material suppliers and compound formulators
• Compression and injection moulding manufacturers
• Test laboratories and QA/QC engineers
• Design engineers specifying PF‑PMC materials for industrial, electrical or structural components

Related standards

• ISO 14526‑1:1999 - Designation system and basis for specifications
• ISO 14526‑2:1999 - Preparation of test specimens and determination of properties (test methods)
• ISO 800:1992 and ISO 472:1999 (vocabulary and legacy reference)

Keywords: ISO 14526-3, phenolic powder moulding compounds, PF-PMCs, material specification, compression moulding, injection moulding, mechanical properties, thermal properties, electrical properties, material designation.