SIST EN ISO 1183-1:2025 PDF

Overview

EN ISO 1183-1:2025 - "Plastics - Methods for determining the density of non‑cellular plastics - Part 1" (CEN adoption of ISO 1183-1:2025) defines three standardized laboratory methods to measure the density of non‑cellular (void‑free) plastics in a variety of forms: moulded/extruded solids, powders, flakes and granules. The document updates and replaces the 2019 edition and is intended for use in conditioning, testing and reporting of plastic material density for quality control, specification and R&D.

Key topics and technical requirements

• Three test methods
  • Method A - Immersion method: for solid, void‑free plastics (except powders). Includes apparatus, immersion liquids, specimen preparation and two suspension variants (classic wire suspension and an alternate wire‑free version).
  • Method B - Liquid pycnometer method: for particles, powders, flakes, granules or small pieces; covers pycnometer requirements and procedure.
  • Method C - Titration method: applicable to plastics in any void‑free form; includes recommended liquid systems and titration procedure.
• Measurement fundamentals
  • Use of appropriate immersion liquids, control of test atmosphere and conditioning (references ISO 291), and handling of small or irregular specimens.
  • Buoyancy corrections (including air buoyancy) and updated formulae for density calculation are incorporated into the procedures.
• Supporting annexes
  • Annex B (normative): calculation of air density used for buoyancy corrections.
  • Annex C (informative): methods and formulae for determining specimen volume when using immersion.
  • Annex D: derivation of formulae; Annex E: precision statement; Annex A: suitable liquid systems for Method C.
• Test report and precision requirements are specified to ensure reproducible results and traceable documentation.

Practical applications

• Routine quality control and acceptance testing of plastic parts and raw plastic powders/granules.
• Material specification and verification where density is an indicator of composition, compounding or void content.
• R&D and failure analysis where density changes reflect physical structure or formulation differences.
• Evaluating homogeneity and uniformity of batches or specimens.

Who should use this standard

• Plastics testing laboratories and calibration facilities
• Polymer material manufacturers, compounders and converters
• Product designers and quality engineers specifying material properties
• Certification and regulatory bodies requiring standardized density data

Related standards (for implementation)

• ISO 291 (conditioning and testing atmospheres)
• Other parts of the ISO 1183 series for additional density/density‑related methods

Keywords: ISO 1183-1:2025, density of plastics, immersion method, liquid pycnometer, titration method, non‑cellular plastics, plastic material testing, quality control, material specification.