This part of ISO 21003 specifies the characteristics for the fitness for purpose of multilayer piping systems
intended to be used for hot and cold water installations inside buildings for the conveyance of water —
whether or not the water is intended for human consumption (domestic systems) or for heating systems —
under specified design pressures and temperatures appropriate to the class of application (see Table 1 of
ISO 21003:2008).
It also specifies the test parameters for the test methods referred to in this part of ISO 21003.
ISO 21003 is a reference product standard. It is applicable to multilayer pipes, fittings, their joints, and also to
joints with components made of other plastics and non-plastics materials intended to be used for hot and cold
water installations. This part of ISO 21003 is intended for use only in conjunction with all the other parts of
ISO 21003.
ISO 21003 covers a range of service conditions (application classes) and design pressures. It is not applicable
for values of design temperature, TD, maximum design temperature, Tmax, and malfunction temperature, Tmal,
in excess of those in Table 1 of ISO 21003-1:2008.
NOTE 1 It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects,
taking into account their particular requirements and any relevant national regulations and installation practices or codes.
The polymeric materials used for the stress-designed layers are the following: polybutylene (PB), polyethylene
of raised temperature resistance (PE-RT), crosslinked polyethylene (PE-X), polypropylene (PP) and
chlorinated poly(vinyl chloride) (PVC-C).
The PE-X used shall be fully crosslinked and shall comply with the requirements of the relevant reference
product standard (ISO 15875).
NOTE 2 For the purposes of this ISO 21003, crosslinked polyethylene (PE-X) as well as adhesives are considered as
thermoplastic materials.
EN ISO 21003-5:2008 Referenced Document
EN 12293 Plastics piping systems - Thermoplastics pipes and fittings for hot and cold water - Test method for the resistance of mounted assemblies to temperature cycling
EN 12294 Plastics piping systems - Systems for hot and cold water - Test method for leaktightness under vacuum
EN 12295 Plastics piping systems - Thermoplastics pipes and associated fittings for hot and cold water - Test method for resistance of joints to pressure cycling
EN 712 Thermoplastics Piping Systems - End-Load Bearing Mechanical Joints Between Pressure Pipes and Fittings - Test Method for Resistance to Pull-Out Under Constant Longitudinal Force
EN 713 Plastics Piping Systems - Mechanical Joints Between Fittings and Polyolefin Pressure Pipes - Test Method for Leaktightness Under Internal Pressure of Assemblies Subjected to Bending
ISO 1167-1 Thermoplastics pipes, fittings and assemblies for the conveyance of fluids - Determination of the resistance to internal pressure - Part 1: General method
ISO 1167-2 Thermoplastics pipes, fittings and assemblies for the conveyance of fluids - Determination of the resistance to internal pressure - Part 2: Preparation of pipe test pieces
ISO 1167-3 Thermoplastics pipes, fittings and assemblies for the conveyance of fluids - Determination of the resistance to internal pressure - Part 3: Preparation of components
ISO 1167-4 Thermoplastics pipes, fittings and assemblies for the conveyance of fluids - Determination of the resistance to internal pressure - Part 4: Preparation of assemblies
ISO 13760 Plastics pipes for the conveyance of fluids under pressure - Miner's rule - Calculation method for cumulative damage
ISO 15874-5 Plastics piping systems for hot and cold water installations - Polypropylene (PP) - Part 5: Fitness for purpose of the system; Amendment 1*， 2018-07-01 Update
ISO 15875-5 Plastics piping systems for hot and cold water installations - Crosslinked polyethylene (PE-X) - Part 5: Fitness for purpose of the system; Technical Corrigendum 1
ISO 15876-5 Plastics piping systems for hot and cold water installations — Polybutene (PB) — Part 5: Fitness for purpose of the system — Amendment 1*， 2020-12-04 Update
ISO 15877-5 Plastics piping systems for hot and cold water installations — Chlorinated poly(vinyl chloride) (PVC-C) — Part 5: Fitness for purpose of the system AMENDMENT 1*， 2009-01-01 Update
ISO 17456 Plastics piping systems - Multilayer pipes - Determination of long-term strength
ISO 21003-1:2008 Multilayer piping systems for hot and cold water installations inside buildings - Part 1: General
ISO 21003-2:2008 Multilayer piping systems for hot and cold water installations inside buildings - Part 2: Pipes
ISO 21003-3 Multilayer piping systems for hot and cold water installations inside buildings — Part 3: Fittings — Amendment 1*， 2021-10-13 Update
ISO 22391-5 Plastics piping systems for hot and cold water installations - Polyethylene of raised temperature resistance (PE-RT) - Part 5: Fitness for purpose of the system; Amendment 1*， 2020-11-30 Update
EN ISO 21003-5:2008 history
2008EN ISO 21003-5:2008 Multilayer piping systems for hot and cold water installations inside buildings - Part 5: Fitness for purpose of the system