This part of ISO 21003 specifies the general aspects 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 heating systems — under specified design pressures
and temperatures appropriate to the class of application (see Table 1).
ISO 21003 is a reference product standard (see 3.4.3). 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 applies only to multilayer pipes with their inner layer made of plastics.
It 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.
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 ISO 21003, crosslinked polyethylene (PE-X) as well as adhesives are considered as
thermoplastic materials.
Solid-wall pipes with thin outer layers (applied as protection layers or barrier layers, for instance) are not
covered by ISO 21003 but are specified in the Amendments to ISO 15874-2, ISO 15875-2 and ISO 15876-2.
The total thickness of such outer layers, including the thickness of the adhesives used, shall be u 0,4 mm.
EN ISO 21003-1:2008 Referenced Document
ISO 1043-1 Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special characteristics AMENDMENT 1: New symbol ST for syndiotactic*， 2011-01-01 Update
ISO 15874-1 Plastics piping systems for hot and cold water installations — Polypropylene (PP) — Part 1: General — Amendment 1: Impact test*， 2022-06-13 Update
ISO 15874-2 Plastics piping systems for hot and cold water installations — Polypropylene (PP) — Part 2: Pipes AMENDMENT 1*， 2013-01-01 Update
ISO 15874-3 Plastics piping systems for hot and cold water installations — Polypropylene (PP) — Part 3: Fittings AMENDMENT 1*， 2013-01-01 Update
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 15875-1 Plastics piping systems for hot and cold water installations — Crosslinked polyethylene (PE-X) — Part 1: General AMENDMENT 1
ISO 15875-2 Plastics piping systems for hot and cold water installations — Crosslinked polyethylene (PE-X) — Part 2: Pipes AMENDMENT 1
ISO 15875-3 Plastics piping systems for hot and cold water installations — Crosslinked polyethylene (PE-X) — Part 3: Fittings — Amendment 2*， 2021-10-13 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 15876-1 Plastics piping systems for hot and cold water installations - Polybutene (PB) - Part 1: General*， 2017-01-01 Update
ISO 15876-2 Plastics piping systems for hot and cold water installations — Polybutene (PB) — Part 2: Pipes — Amendment 1*， 2020-12-02 Update
ISO 15876-3 Plastics piping systems for hot and cold water installations — Polybutene (PB) — Part 3: Fittings — Amendment 2*， 2021-10-13 Update
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 15877-1 Plastics piping systems for hot and cold water installations — Chlorinated poly(vinyl chloride) (PVC-C) — Part 1: General AMENDMENT 1*， 2009-01-01 Update
ISO 15877-2 Plastics piping systems for hot and cold water installations — Chlorinated poly(vinyl chloride) (PVC-C) — Part 2: Pipes AMENDMENT 1*， 2009-01-01 Update
ISO 15877-3 Plastics piping systems for hot and cold water installations — Chlorinated poly(vinyl chloride) (PVC-C) — Part 3: Fittings AMENDMENT 1*， 2009-01-01 Update
ISO 3 Preferred numbers; Series of preferred numbers