Abstract

This document specifies a method to determine the resistance to slow crack growth (SCG) of thermoplastic materials, pipes, and fittings. The test is applicable to samples taken from compression moulded sheets, extruded rods, sheets or pipes and injection moulded fittings of suitable thickness. This document provides a method that is suitable for an accelerated fracture-mechanics characterization at ambient temperatures of 23 °C. This document specifies test parameters for polyethylene (PE), polypropylene (PP) and unplasticized polyamide (PA-U). Furthermore, this test can be applied to characterise the slow crack growth resistance of virgin, as well as non-virgin (reused, recycled) thermoplastic materials. This test method can be adapted for other thermoplastics materials by developing the procedure using different test parameters.

Begin

2025-03-03

WI

00155A2A

Planned document number

DIN EN ISO 18489

Project number

05402388

Responsible national committee

NA 054-05-02 AA - Test methods for plastic pipes  

Responsible european committee

CEN/TC 155/WG 12 - Pressure systems of polyolefin material for gas supply, water supply and drainage and sewerage  

Responsible international committee

ISO/TC 138/SC 5/WG 20 - Slow crack growth (SCG)  

draft standard

Thermoplastic materials for piping systems - Determination of resistance to slow crack growth under cyclic loading - Cracked Round Bar (CRB) test method (ISO/DIS 18489:2025); German and English version prEN ISO 18489:2025
2025-11
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