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 (< 10 ppb) for preconditioning.
• Apparatus and sensors: Oven (40 ± 0.5 °C and/or 80 ± 0.5 °C), closed stainless-steel test rig, water pump and flow meter (0.15–0.5 dm3/min), oxygen sensor capable of ~0.1 ppb to 20 ppm, pressure and temperature meters.
• Test piece: Typical free sample length (20 ± 0.5) m; measure and record inside diameter and free length; precondition per the referring standard (ISO 1167 recommended if unspecified).
• Calculations: Procedures to compute barrier surface area, inside volume, atmospheric pressure correction and final flux (g/m2·h and mg/m2·day) are provided.

Applications and users

ISO 17455:2005 is relevant to:

• Manufacturers of multilayer plastic pipes (quality control and product development)
• Independent testing laboratories performing certification or compliance testing
• System designers and specifiers who need validated barrier performance data (to limit oxygen ingress)
• Standards committees and regulatory bodies referencing test methods in product or system standards

The standard helps ensure consistent, comparable measurement of oxygen permeability for multilayer pipes where a barrier layer is intended to prevent or reduce oxygen transport into the pipe interior.

Related standards

• ISO 17456 - Multilayer pipes - Determination of long‑term strength
• ISO 17454 - Multilayer pipes - Test method for adhesion of layers
• ISO 1167 - Referenced for conditioning times related to wall thickness

Keywords: ISO 17455:2005, oxygen permeability, multilayer pipes, barrier layer, dynamic method, static method, plastics piping systems, oxygen sensor, flux calculation.