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BS ISO 17744:2004

Current
Current

The latest, up-to-date edition.

Plastics. Determination of specific volume as a function of temperature and pressure (pVT diagram). Piston apparatus method
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

12-08-2004

This International Standard describes procedures for determining the specific volume of plastics as a function of temperature and pressure in both the molten and solid states.

The standard specifies the use of a piston-equipped apparatus in which the test sample, held in a measurement cell, is pressurized by means of the piston. Measurements under conditions of constant pressure or constant temperature can be made. In the constant-pressure mode, the maximum heating and cooling rates permissible are restricted to 5°C/min.

NOTE Higher heating and cooling rates can be used, but data will then have to be corrected for thermal gradients[13].

For the acquisition of data needed for processing design, it is recommended that the isobaric cooling method be used (see ISO17282). The result of this measurement cannot be used directly for injection-moulding simulation.

By using these procedures, it is possible to obtain:

  • pvT diagrams that represent the relationship which exists between pressure, specific volume and temperature for a given material;

  • compressibility and volumetric thermal-expansion coefficients;

  • information on first-order and glass transitions as a function of temperature and pressure.

Although thermoplastic polymers are currently tested down to room temperature using these procedures, it is emphasized that, at temperatures lower than Tg, the difficulty in achieving a true hydrostatic state is a source of uncertainty on the specific volume measurement.

Committee
PRI/21
DevelopmentNote
Supersedes 03/105579 DC. (12/2004)
DocumentType
Standard
Pages
28
PublisherName
British Standards Institution
Status
Current
Supersedes

Standards Relationship
ISO 17744:2004 Identical

ISO 6507-1:2005 Metallic materials Vickers hardness test Part 1: Test method
ISO 4287:1997 Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms, definitions and surface texture parameters
ISO 1183:1987 Plastics Methods for determining the density and relative density of non-cellular plastics
XP T51 561 : 1990 XP PLASTICS - DETERMINATION OF THE DENSITY AS A FUNCTION OF TEMPERATURE
ISO 7500-1:2015 Metallic materials Calibration and verification of static uniaxial testing machines Part 1: Tension/compression testing machines Calibration and verification of the force-measuring system
ISO 17282:2004 Plastics — Guide to the acquisition and presentation of design data

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