ISO 11443:2014
2014-04
Abstract
ISO 11443:2014 specifies methods for determining the fluidity of plastics melts subjected to shear stresses at rates and temperatures approximating to those arising in plastics processing. Testing plastics melts in accordance with these methods is necessary since the fluidity of plastics melts is generally not dependent solely on temperature, but also on other parameters, in particular shear rate and shear stress.
The methods described in ISO 11443:2014 are useful for determining melt viscosities from 10 Pa∙s to 107 Pa∙s, depending on the measurement range of the pressure and/or force transducer and the mechanical and physical characteristics of the rheometer. The shear rates occurring in extrusion rheometers range from 1 s-1 to 106 s-1.
Elongational effects at the die entrance cause extrudate swelling at the die exit. Methods for assessing extrudate swelling have also been included.
The rheological techniques described are not limited to the characterization of wall-adhering thermoplastics melts only; for example, thermoplastics exhibiting "slip" effects and thermosetting plastics can be included. However, the methods used for determining the shear rate and shear viscosity are invalid for materials which are not wall-adhering. Nevertheless, ISO 11443:2014 can be used to characterize the rheological behaviour of such fluids for a given geometry.
General information
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Status: WithdrawnPublication date: 2014-04Stage: Withdrawal of International Standard [95.99]
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Edition: 3Number of pages: 36
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Technical Committee :ISO/TC 61/SC 5ICS :83.080.01
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Life cycle
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Previously
WithdrawnISO 11443:2005
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Now
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Revised by
PublishedISO 11443:2021