ISO 15875-2:2003

Overview

ISO 15875-2:2003 specifies the requirements for pipes made from crosslinked polyethylene (PE‑X) used in piping systems for hot and cold water installations within buildings. It defines material, geometrical, mechanical, physical and performance requirements, and the test parameters needed to verify long‑term hydrostatic strength and other properties. The standard applies to domestic water and heating systems under the design pressures and temperatures defined by ISO 15875‑1 and covers pipes with or without barrier layers and their joints with other PE‑X, plastic and non‑plastic components.

Key Topics and Requirements

• Material requirements: Pipe material must be polyethylene that has been crosslinked (peroxide, silane, electron beam or azo processes) producing a 3‑dimensional network; degree of crosslinking is assessed (see EN 579).
• Long‑term strength (sLCL / s‑values): Evaluation is carried out in accordance with EN ISO 9080 and EN 921. Test data are compared to reference curves; conformance is demonstrated by plotting failure times and hoop stresses (a high proportion of results must lie on or above the reference line).
• Geometrical characteristics: Dimensions and tolerances are measured per EN ISO 3126; calculated pipe design value S (Scalc,max) must meet the values for the applicable application class and design pressure.
• General characteristics: Surface finish, end squareness and opacity requirements (opaque PE‑X pipes declared as such shall transmit ≤ 0.2% visible light per EN 578).
• Test methods and marking: The standard specifies the test parameters for referenced methods and the minimum marking requirements for traceability and conformity.

Applications

ISO 15875‑2 is intended for:

• Domestic potable water systems (pipes conveying water that may or may not be for human consumption)
• Building heating systems (radiator and underfloor heating circuits)
• Installation scenarios where PE‑X pipes are joined to other PE‑X or compatible plastic/non‑plastic fittings
• Systems where barrier layers are used to control oxygen diffusion or light transmission

Practical benefits include predictable long‑term performance, compatibility guidance for joints, and a test framework for product certification and specification.

Who uses this standard

• Pipe and component manufacturers
• Plumbing and mechanical design engineers
• Building services specifiers and procurement teams
• Certification bodies and test laboratories
• Regulatory authorities and code officials
• Installers and contractors seeking compliant PE‑X piping products

Related standards

• ISO 15875‑1:2003 - General
• ISO 15875‑3 - Fittings
• ISO 15875‑5 - Fitness for purpose of the system
• ISO 15875‑7 - Conformity assessment guidance
• Other system standards for alternative materials: ISO 15874 (PP), ISO 15876 (PB), ISO 15877 (PVC‑C)

Keywords: ISO 15875-2, PE‑X pipes, crosslinked polyethylene, hot and cold water installations, piping systems, design pressure, application classes, long‑term hydrostatic strength.