ISO 17455:2005

Overview

ISO 17455:2005 - "Plastics piping systems - Multilayer pipes - Determination of the oxygen permeability of the barrier pipe" defines laboratory test methods to measure how much oxygen passes through the barrier layer of multilayer plastic pipes. The standard specifies two equivalent test methods - the dynamic (Method I) and static (Method II) - and describes the test principle, required apparatus, sample preparation, measuring procedures and calculation of oxygen flux.

Key topics and technical requirements

• Scope and principle: Measurement of oxygen transfer through the test-piece wall in a closed system; the increased oxygen in the system is attributed to permeation through the barrier layer.
• Test methods:
  • Method I (Dynamic): Continuous water circulation (max 0.5 dm3/min), measure oxygen concentration over time; Stage 2 (approx. 5 h) yields a constant rate for flux calculation.
  • Method II (Static): Stagnant water inside the pipe for 6 h, then displaced and total oxygen collected and integrated to determine flux.
• Acceptance and repeatability: Use results only when three successive measurements are within 5% of each other during the steady stage.
• Test conditions: Test temperatures specified as 40 °C or 80 °C (as required by the product/system standard); use deionized water (pH 7) and oxygen-reduced water (