This International Standard 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 International Standard. The test conditions normally used for thermoplastics are listed in
Annexes A and B.
The MVR will be found particularly useful when comparing materials of different filler content and when
comparing filled with unfilled thermoplastics. The MFR can be determined from MVR measurements provided
the melt density at the test temperature and pressure is known.
These methods are in principle also applicable to thermoplastics for which the rheological behaviour is
affected during the measurement by phenomena such as hydrolysis, condensation or crosslinking, 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, these methods are not
appropriate. In such cases, the use of the viscosity number in dilute solution, determined in accordance with
the relevant part of ISO 1628, is recommended for characterization purposes.
NOTE The rates of shear in these methods are much smaller than those used under normal conditions of processing,
and therefore data obtained by these methods for various thermoplastics may not always correlate with their behaviour
during processing. Both methods are used primarily in quality control.
BS EN ISO 1133:2005 history
2012BS EN ISO 1133-1:2011 Plastics. Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics. Standard method
2005BS EN ISO 1133:2005 Plastics - Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of thermoplastics
1997BS EN ISO 1133:1997 Plastics - Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of thermoplastics