Plastics - Polyamides - Determination of viscosity number (ISO/DIS 307:2026)

Comment end date 2026-08-18

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Project stage codes

1. Prioritetinių darbo temų pažymėjimas ir ekspertų skyrimas

2. Projektas

3. Viešoji apklausa

From 2026-06-19 till 2026-08-18

4. Closure of enquiry

5. Submission to Formal Vote

Organisation

CEN Europos standartizacijos komitetas

ICS

83.080.20 - Thermoplastic materials

Technical Committee

TK 68 Plastics

ForeignTC'S

CEN/TC 249

Number of comments

Comment start date

2026-06-19

Scope

This document specifies a method for the determination of the viscosity number of dilute solutions of polyamides in certain specified solvents. The method is applicable to the polyamides designated PA 46, PA 6, PA 66, PA 69, PA 610, PA 612, PA 11, PA 12, PA 6T/66, PA 6I/6T, PA 6T/6I/66, PA 6T/6I, PA 6I/6T/66 and PA MXD6 as defined in ISO 16396-1, as well as to co-polyamides, compounds of polyamides and other polyamides that are soluble in one of the specified solvents under the specified conditions. The method is not applicable to polyamides produced by anionic polymerization of lactams or produced with cross-linking agents; such polyamides are normally insoluble in the specified solvents. The viscosity number is determined by the general procedure specified in ISO 1628-1:2024, observing the particular conditions specified in this document.

Relations

Pakeis

prEN ISO 307