Abstract

This document specifies methods for determining the initial ring stiffness of glass-reinforced thermosetting plastics (GRP) pipes. Two methods are given (constant load and constant deflection), and within the specified deflection limits, each is equally valid and can be used for any diameter.

Begin

2026-04-20

WI

00155A35

Planned document number

DIN EN ISO 7685

Project number

05402423

Responsible national committee

NA 054-05-09 AA - Plastics pipes of thermosetting materials  

Responsible european committee

CEN/TC 155/WG 14 - Systems of glass-reinforced thermosetting plastics for all applications - Polyester, epoxy and polyester resin based concrete  

Responsible international committee

ISO/TC 138/SC 6/WG 1 - Methods of test  

draft standard

Glass-reinforced thermosetting plastics (GRP) pipes - Determination of initial ring stiffness (ISO 7685:2026); German and English version prEN ISO 7685:2026
2026-11
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previous edition(s)

Plastics piping systems - Glass-reinforced thermosetting plastics (GRP) pipes - Determination of initial specific ring stiffness; German version EN 1228:1996
1996-08

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