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  • BSI
    20/30406608 DC BS ISO 20965. Plastics. Determination of the transient extensional viscosity of polymer melts
    Edition: 2020
    $44.66
    / user per year

Description of 20/30406608 DC 2020

This document specifies the general principles of a method for determining the transient extensional viscosity of polymer melts. The procedure details the measurement of polymer melt specimens stretched uniaxially under conditions of constant strain rate and constant temperature.

The method is capable of measuring the transient extensional viscosity of polymer melts at Hencky strain rates typically in the range 0,01 s–1 to 1 s–1, at Hencky strains up to approximately 4 and at temperatures up to approximately 250 °C (see Notes 1 and 2). It is suitable for measuring transient extensional viscosity values typically in the range from approximately 104 Pa⋅s to 107 Pa⋅s (see Note 3).

NOTE 1

Hencky strains and strain rates are used (see Clause 3).

NOTE 2

Values of strain, strain rate and temperature outside these limiting values can be attained.

NOTE 3

The operating limit of an instrument, in terms of the lowest transient extensional viscosity values that can be measured, is due to a combination of factors, including the ability of the specimen to maintain its shape during testing and the resolution of the instrument.

A list of documents related to this document is given in the Bibliography.



Standard Number20/30406608 DC
TitleBS ISO 20965. Plastics. Determination of the transient extensional viscosity of polymer melts
StatusDefinitive
Publication Date2020-04-23
Identical National Standard OfISO/DIS 20965
DescriptorsExtensibility, Viscosity measurement, Polymers, Transient, Strain, Plastics, Viscosity, Tensile strain, Testing conditions, Plastics and rubber technology
ICS83.080.01 Plastics in general
CommitteePRI/21
PublisherBSI
Pages25

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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