Overview
EN ISO 14631:2021 - "Extruded sheets of impact‑modified polystyrene (PS‑I) - Requirements and test methods" - is a CEN-adopted ISO standard that specifies requirements and standardized test methods for solid, flat extruded sheets of impact‑modified polystyrene (PS‑I) without fillers or reinforcements. The standard applies to sheets (including roll form) with thicknesses from 0.25 mm to 20.0 mm. EN ISO 14631:2021 updates and supersedes the previous edition (1999) and aligns material specification, dimensional control, mechanical and thermal testing, and marking for PS‑I extruded sheet products.
Key Topics
- Material scope: Solid flat extruded PS‑I sheets, unfilled and non‑reinforced; also covers sheet in roll form.
- Appearance and visual requirements: Criteria for surface condition and acceptability on delivery.
- Dimensional tolerances:
- Thickness measurement and tolerances
- Length, width and rectangularity
- Bow (for sheets supplied in rolls)
- Mechanical properties and testing:
- Tensile properties (ISO 527 series): yield stress, strain at break, modulus
- Charpy impact strength (notched and unnotched) (ISO 179‑1)
- Multiaxial impact behaviour (ISO 6603‑1)
- Ball indentation hardness (ISO 2039‑1)
- Thermal properties and behaviour:
- Vicat softening temperature (ISO 306)
- Dimensional change / shrinkage after heating (ISO 11501)
- Density, specimen preparation, conditioning and delivery condition: Methods for sampling, conditioning (ISO 291) and density determination (ISO 1183).
- Designation and marking: How to identify grade, thickness and relevant properties on product labelling.
Applications and Who Uses This Standard
- Sheet manufacturers and extruders use EN ISO 14631:2021 to define product specifications, quality control procedures and to ensure consistent production of PS‑I extruded sheet.
- Materials and quality laboratories implement the standardized test methods for acceptance testing and material certification.
- Product designers, specifiers and procurement teams reference the standard when specifying PS‑I sheet for applications that require known mechanical and thermal performance.
- Regulatory and conformity assessment bodies rely on the standard to evaluate compliance with product claims and safety requirements.
Related Standards
EN ISO 14631:2021 references several normative standards for test methods and definitions, including:
Keywords: EN ISO 14631:2021, impact‑modified polystyrene, PS‑I sheet, extruded sheets, test methods, dimensional tolerances, Charpy impact, Vicat softening temperature.
