This document specifies two procedures for the determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of thermoplastic materials under specified conditions of temperature and load. Procedure A is a mass-measurement method. Procedure B is a displacement-measurement method. Normally, the test conditions for measurement of melt flow rate are specified in the material standard with a reference to this document. The test conditions normally used for thermoplastics are listed in Annex A.The MVR is particularly useful when comparing materials of different filler content and when comparing filled with unfilled thermoplastics. The MFR can be determined from MVR measurements, or vice versa, provided the melt density at the test temperature is known.This document is also possibly applicable to thermoplastics for which the rheological behaviour is affected during the measurement by phenomena such as hydrolysis (chain scission), condensation and cross-linking, but only if the effect is limited in extent and only if the repeatability and reproducibility are within an acceptable range. For materials which show significantly affected rheological behaviour during testing, this document is not appropriate. In such cases, ISO 1133-2 applies.NOTE The rates of shear in these methods are much smaller than those used under normal conditions of processing, and therefore it is possible that data obtained by these methods for various thermoplastics will not always correlate with their behaviour during processing. Both methods are used primarily in quality control.
This document specifies two procedures for the determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of thermoplastic materials under specified conditions of temperature and load. Procedure A is a mass-measurement method. Procedure B is a displacement-measurement method. Normally, the test conditions for measurement of melt flow rate are specified in the material standard with a reference to this document. The test conditions normally used for thermoplastics are listed in Annex A.
The MVR is particularly useful when comparing materials of different filler content and when comparing filled with unfilled thermoplastics. The MFR can be determined from MVR measurements, or vice versa, provided the melt density at the test temperature is known.
This document is also possibly applicable to thermoplastics for which the rheological behaviour is affected during the measurement by phenomena such as hydrolysis (chain scission), condensation and cross-linking, but only if the effect is limited in extent and only if the repeatability and reproducibility are within an acceptable range. For materials which show significantly affected rheological behaviour during testing, this document is not appropriate. In such cases, ISO 1133-2 applies.
NOTE The rates of shear in these methods are much smaller than those used under normal conditions of processing, and therefore it is possible that data obtained by these methods for various thermoplastics will not always correlate with their behaviour during processing. Both methods are used primarily in quality control.
L'ISO 1133-1:2011 spécifie deux modes opératoires pour la détermination de l'indice de fluidité à chaud en masse (MFR) et en volume (MVR) des matériaux thermoplastiques, dans des conditions définies de température et de charge. Le mode opératoire A est une méthode de mesurage de la masse. Le mode opératoire B est une méthode de mesurage du volume déplacé. En principe, les conditions d'essai pour la détermination de l'indice de fluidité à chaud sont spécifiées dans la norme relative au matériau avec une référence à l'ISO 1133-1:2011. Les conditions normalement utilisées pour l'essai des matériaux thermoplastiques sont énumérées en annexe. Le MVR est particulièrement utile pour comparer des matériaux à teneur en charges différentes et pour comparer des thermoplastiques chargés avec ceux non chargés. Le MFR peut être déterminé à partir de mesurages MVR, ou inversement, à condition que la masse volumique à l'état fondu à la température d'essai soit connue. L'ISO 1133-1:2011 peut également être applicable aux thermoplastiques dont le comportement rhéologique est affecté pendant le mesurage par des phénomènes tels que l'hydrolyse (scission de la chaîne), la condensation et la réticulation, mais uniquement si cet effet est d'ampleur limitée et seulement si la répétabilité et la reproductibilité sont comprises dans des limites acceptables. L'ISO 1133-1:2011 n'est pas appropriée aux matériaux dont le comportement rhéologique varie de façon significative pendant les essais. Dans de tels cas, l'ISO 1133-2 s'applique.
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