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prEN ISO 18488

Polyethylene (PE) materials for piping systems - Determination of strain hardening modulus in relation to slow crack growth - Test method (ISO 18488:2025)

Draft Public enquiry
Comment end date 2027-01-11
Export comments Read draft and comment

Project stage codes

1. Decision on WI Proposal
2. Projektas
3. Viešoji apklausa
From 2026-11-12 till 2027-01-11
4. Closure of enquiry
5. Submission to Formal Vote

Organisation

CEN Europos standartizacijos komitetas

ICS

23.040.45 - Plastics fittings

Technical Committee

TK 68 Plastics

ForeignTC'S

CEN/TC 155

Number of comments

0

Comment start date

2026-11-12

Scope

This document specifies a method for the determination of the strain hardening modulus, which is used as a measure for the resistance to slow crack growth of polyethylene. This document specifies how to obtain a strain hardening modulus measurement from “true stress vs. draw ratio” curves on compression moulded samples. Details of the necessary equipment, precision and sample preparation for the generation of data are given. This document provides a method that is valid for all types of polyethylene, independent from the manufacturing technology, comonomer or catalyst type used for pipes and fittings applications.