ISO 4075:2025
(Main)Polysulfone (PSU) — Effect of time and temperature on expected strength
Polysulfone (PSU) — Effect of time and temperature on expected strength
This document specifies the minimum values for expected strength as a function of time and temperature in the form of reference lines, for use in calculations on polysulfone (PSU) injection moulded fittings. This document is applicable for polysulfone homopolymer compounds only.
Polysulfone (PSU) — Influence du temps et de la température sur la résistance attendue
General Information
Standards Content (Sample)
International
Standard
ISO 4075
First edition
Polysulfone (PSU) — Effect of time
2025-06
and temperature on expected
strength
Polysulfone (PSU) — Influence du temps et de la température sur
la résistance attendue
Reference number
© ISO 2025
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Basic formulae . 2
5 Expected strength . 2
5.1 Extrapolation limits .2
5.2 Graphical representation .3
5.3 Tabulated values .3
6 Demonstrating conformance . 3
7 Derivation of wall thicknesses . . 3
Annex A (normative) Demonstrating conformance to the reference lines . 6
Annex B (informative) Derivation of S values . 7
calc, max
Bibliography .10
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
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with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
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This document was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the
transport of fluids, Subcommittee SC 5, General properties of pipes, fittings and valves of plastic materials and
their accessories —Test methods and basic specifications.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
In the early 2000s, manufacturers of plastics and multilayer piping systems for hot and cold-water
installations began to consider the use of alternative plastics materials beside the widely used metallic
materials (e.g. copper alloys or stainless steel) for components and fittings. Before this point, however,
no materials were available which had the high material strengths which are required for fittings and
components.
With the market availability of polyvinylidene fluoride (PVDF), polysulfone (PSU) and polyphenylsulfone
(PPSU), the option for the use of plastics materials, instead of metallic materials, for fittings and components,
as part of plastics and multilayer piping systems, was made possible and products mainly produced by
injection molding, have been introduced into the market.
In the beginning, the design and the calculation for the dimensions was based on individual ISO 9080
analyses for each individual PVDF/PSU/PPSU compound.
This document has been developed with the intention to align the values for the expected strength over the
time (reference lines) for PVDF/PSU/PPSU, in order to simplify and unify all design procedures for which the
expected strength over the time is needed.
The reference lines for polysulfone (PSU) referred to in this document have been agreed upon by a group of
experts from ISO/TC 138, SC5, after considering experimental data and have been accepted by the relevant
ISO technical committees.
At the date of publication of this document, the following International Standards dealing with plastics and
multilayer piping systems for hot and cold water installations have been published:
— ISO 15874 series, Plastics piping systems for hot and cold water installations - Polypropylene (PP)
— ISO 15875 series, Plastics piping systems for hot and cold water installations - Crosslinked
polyethylene (PE-X)
— ISO 15876 series, Plastics piping systems for hot and cold water installations - Polybutene (PB)
— ISO 15877 series, Plastics piping systems for hot and cold water installations - Chlorinated poly(vinyl
chloride) (PVC-C)
— ISO 22391 series, Plastics piping systems for hot and cold water installations - Polyethylene of raised
temperature resistance (PE-RT)
— ISO 21003 series, Multilayer piping systems for hot and cold water installations inside buildings
v
International Standard ISO 4075:2025(en)
Polysulfone (PSU) — Effect of time and temperature on
expected strength
1 Scope
This document specifies the minimum values for expected strength as a function of time and temperature in
the form of reference lines, for use in calculations on polysulfone (PSU) injection moulded fittings.
This document is applicable for polysulfone homopolymer compounds only.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
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 9080:2012, Plastics piping and ducti
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