SIST EN ISO 21305-1:2019 PDF

Overview

EN ISO 21305-1:2019 - Plastics - Polycarbonate (PC) moulding and extrusion materials - Part 1: Designation system and basis for specifications - establishes a standardized system to identify and classify polycarbonate (PC) materials used for moulding and extrusion. The standard defines a structured designation composed of an identity block and five data blocks to capture polymer composition, fillers/reinforcements, intended application or processing, designatory properties and optional specification requirements. It applies to PC homopolymers and copolymers, both unmodified and modified (colourants, additives, fillers, reinforcements, polymer modifiers).

Key topics and requirements

• Designation system: A standardized pattern (identity + individual-item block) with five data blocks for clear material identification.
• Data blocks 1–5:
  • Data block 1: Abbreviated polymer ID (“PC”) and composition symbol.
  • Data block 2: Fillers/reinforcing material codes, physical form and mass content.
  • Data block 3: Intended application or processing method and key additives/properties.
  • Data block 4: Designatory properties - notably melt volume-flow rate (MVR) and Charpy notched impact strength.
  • Data block 5: Information needed to transform a designation into a formal specification.
• Classification basis: Differentiation by levels of designatory properties (MVR and Charpy notched impact strength) plus information on processing, additives, colorants, fillers and reinforcing materials.
• Scope limitations: The standard is a designation and specification basis - it does not provide engineering performance data, processing conditions or guaranteed equivalence of performance between identically designated materials. Additional property tests should be performed per ISO 21305-2 when required.
• Notation rules: Use of hyphens, commas to separate blocks, and codes (including combined codes for mixtures, e.g., GF25+MD10) for unambiguous labelling.

Applications and users

Who uses EN ISO 21305-1:2019 and why:

• Material suppliers - standardize product codes and technical data sheets for PC grades.
• Design and product engineers - select appropriate PC grades by MVR and impact class for part performance.
• Procurement and specification writers - create clear, unambiguous material specifications and purchase requirements.
• Moulders and extruders - reference intended processing codes and material form.
• Testing laboratories and conformity assessors - map designations to required tests (see ISO 21305-2).
• Standards bodies and regulators - harmonize national and international PC material classifications.

Related standards

• ISO 21305-2 - Preparation of test specimens and determination of properties (referenced for testing MVR, Charpy and other properties).
• ISO 1043-1 - Symbols and abbreviated terms for polymers (used for “PC” and composition notation).

Keywords: EN ISO 21305-1:2019, polycarbonate, PC moulding and extrusion materials, designation system, melt volume-flow rate, Charpy notched impact strength, material specification.