ISO/TC 138/SC 5/WG 5 - Polyolefin pipes

This document specifies test methods for the determination of the carbon black content of polyolefin compositions used in particular for the manufacture of pipes and fittings, and provides a basic specification for polyethylene pipes and fittings. This document applies equally to the material for manufacture and to any material taken from a pipe or fitting.

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 crosslinked polyethylene (PE-X) pipes and crosslinked medium density polyethylene (PE-MDX) pipes. NOTE 1 This document is applicable for pipes with the minimum level of crosslinking after production in accordance with Clause 4. NOTE 2 The density range for medium density polyethylene is 926 kg/m3 to 940 kg/m3 in accordance with ISO 17855-1:2014[2].

ISO 13761:2017 specifies a method for the derivation of pressure reduction factors to obtain the allowable operating pressure for operation of polyethylene (PE) pipeline systems at temperatures between 20 °C and 40 °C or 50 °C, dependent on the classification of the material used for manufacture.

ISO 6259-3:2015 specifies a method of determining the tensile properties of polyolefin (polyethylene, cross-linked polyethylene, polypropylene, and polybutene) pipes, and the following properties: the stress at yield and the elongation at break.

The ISO 6259 series specifies a method of determining the tensile properties of thermoplastics pipes, including the following properties: stress at yield, and elongation at break. ISO 6259-1:2015 is applicable to all types of thermoplastics pipe, regardless of their intended use.

ISO 10147:2011 specifies a method for the assessment of the degree of crosslinking in crosslinked polyethylene (PE-X) pipes and fittings by determination of the gel content by solvent extraction.

ISO 3213:2009 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 pipes made of: - polypropylene homopolymer (PP-H); - polypropylene block copolymer (PP-B) (also called heterophasic copolymer); - polypropylene random copolymer (PP-R); - polypropylene random copolymer (this material can be distinguished by DSC testing or another appropriate method to indicate a second melting peak) with a modified crystallinity (PP-RCT).

ISO 7686:2005 specifies a method for the determination of the opacity of plastics pipes and fittings.

ISO 2505:2005 specifies a method for determining the longitudinal reversion of thermoplastics pipes, to be carried out in either a liquid or in air. In case of dispute, heated liquid is used as the reference. ISO 2505:2005 is applicable to all thermoplastics pipes with smooth internal and external walls of constant cross-section. It is not applicable to non-smooth structured-wall thermoplastics pipes.

ISO 16241:2005 specifies a method for determining the resistance to slow crack growth of polyethylene (PE) materials for pipes and fitting products.

ISO 16871:2003 specifies a method for exposing plastics pipes and fittings, individually or assembled, or as pieces therefrom, to natural weathering in order to assess changes. The exposure is considered appropriate for evaluating components subject to yard storage prior to installation and use without further exposure to direct weathering, and is quantified to promote rationalization of exposure doses and comparability of data. For exposures appropriate to tropical or equatorial conditions, attention is drawn to ISO 877.

This International Standard describes a method with two procedures for the assessment of pigment or carbon black particle and agglomerate size and degree of dispersion in polyolefin pipes, fittings and compounds. The method is applicable to polyolefin pipes and fittings, as well as raw material in pellet form, with the choice of procedure to be determined by the referring specification. The method is applicable to carbon black pigmented polyolefin pipes, fittings and compounds with a carbon black content of less than 3 %.

ISO 10147:2004 specifies a method for the assessment of the degree of crosslinking in polyethylene (PE-X) pipes and fittings by determination of the gel content by solvent extraction.

Gives the minimum values for expected strength of polypropylene pipes as a function of time and temperature in the form of reference lines, for use in calculations.