BS ISO 15105-2-2025 PDF

Full title and description

BS ISO 15105-2:2025 — Plastics film and sheeting — Determination of gas‑transmission rate — Part 2: Equal‑pressure method. This is the British adoption (BS ISO) of ISO 15105‑2 (Edition 2, 2025), specifying the equal‑pressure technique and associated procedures, apparatus and reporting for measuring gas‑transmission (for example oxygen transmission) through plastic films, sheets, laminates and flexible coated materials.

Abstract

This standard defines the equal‑pressure method for determination of gas‑transmission rate (GTR) of plastics in film or sheeting form. It covers principle, specimen preparation, conditioning, test apparatus (transmission cell, carrier/test gases), test procedure, detection options (including coulometric oxygen sensors and gas chromatography described in annexes) and expression/reporting of results. The 2025 edition revises and replaces the earlier 2003 edition.

General information

• Status: Published (international standard adopted as BS ISO national publication).
• Publication date: November 2025 (ISO edition 2 published Nov 2025; national BS ISO adoption published November 2025).
• Publisher: British Standards Institution (BSI) — national adoption of the International Standard published by ISO.
• ICS / categories: 83.140.10 (Films and sheets).
• Edition / version: Edition 2 (2025).
• Number of pages: ISO edition: 15 pages; BS ISO (national publication) commonly issued with additional national foreword / cover pages (BS PDF listings show ~22 pages).

Scope

Applies to the determination of the gas‑transmission rate of any plastic material supplied as single‑ or multi‑layer film, sheeting, laminate, co‑extruded material or flexible plastic‑coated material using the equal‑pressure method. The method establishes test conditions, specimen handling, apparatus requirements and detection techniques to obtain reproducible permeation rates under defined temperature and humidity conditions.

Key topics and requirements

• Principle: equal total pressure in two chambers; a difference in partial pressure of the permeant gas drives diffusion from the test gas side into the carrier gas side where permeant is detected.
• Specimen requirements: representative, defect‑free specimens; thickness measurement and number of replicates specified.
• Conditioning and test temperatures: specified conditioning and temperature/RH sets (e.g., 23 °C ±2 °C and defined RH ranges) to ensure comparable results.
• Apparatus: requirements for transmission cell design, permeation area, gaskets, carrier/test gas purity and flow control; typical carrier flows and cell areas given.
• Detection methods: normative annexes describe common detection options — coulometric sensors for oxygen transmission and gas chromatography options for other gases.
• Calculation and reporting: expressions for gas‑transmission rate (e.g., oxygen transmission rate OTR and permeability), units, and reporting of test conditions and uncertainty.

Typical use and users

Used by packaging developers, quality control and materials testing laboratories, film and laminate manufacturers, instrument and sensor manufacturers (OTR/perm testers), and regulatory or certification bodies to characterise barrier performance of films and sheets for food, pharmaceutical and industrial packaging applications. Practitioners use the standard to set test conditions, specify acceptance criteria and compare material performance.

Related standards

ISO 15105‑1 (Differential‑pressure methods) — complementary part addressing differential‑pressure measurement techniques; earlier ISO 15105‑2:2003 (withdrawn) — replaced by the 2025 edition; other permeability and packaging standards from ISO/TC 61 and related committees.

Keywords

gas‑transmission rate, GTR, oxygen transmission rate (OTR), equal‑pressure method, permeability, plastics film, sheeting, laminates, coulometric sensor, gas chromatography, permeation testing, BS ISO 15105‑2.

FAQ

Q: What is this standard?

A: BS ISO 15105‑2:2025 is the British adoption of ISO 15105‑2 (Edition 2, 2025) that specifies the equal‑pressure method for measuring gas‑transmission rates of plastic films and sheeting.

Q: What does it cover?

A: It covers the test principle, specimen preparation, conditioning, apparatus and materials (cells, gases, flows), detection methods (notably coulometric O2 sensors and gas chromatography in annexes), calculation of transmission rate and reporting requirements.

Q: Who typically uses it?

A: Packaging R&D and QC laboratories, film and laminate manufacturers, independent testing laboratories, sensor/equipment manufacturers and conformity/certification bodies concerned with barrier properties of polymer films.

Q: Is it current or superseded?

A: The 2025 edition (Edition 2) is the current version and it replaces the previous ISO 15105‑2:2003 edition, which has been withdrawn. The ISO publication date is November 2025 and the BS ISO national adoption was published in November 2025.

Q: Is it part of a series?

A: Yes — it is Part 2 of the ISO 15105 series (Part 1 covers differential‑pressure methods, ISO 15105‑1), and the series is maintained by ISO/TC 61/SC 11 (plastics films and sheeting).

Q: What are the key keywords?

A: gas‑transmission rate, OTR, permeability, equal‑pressure, plastics film, sheeting, coulometric sensor, gas chromatography, permeation cell.