• BS EN ISO 1133-2:2011

    Current The latest, up-to-date edition.

    Plastics. Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics Method for materials sensitive to time-temperature history and/or moisture

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  31-01-2012

    Publisher:  British Standards Institution

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    Table of Contents - (Show below) - (Hide below)

    Foreword
    Introduction
    1 Scope
    2 Normative references
    3 Terms and definitions
    4 Principle
    5 Apparatus
    6 Test sample
    7 Temperature verification, cleaning and maintenance
       of the apparatus
    8 Procedural set-up
    9 Procedure
    10 Flow rate ratio (FRR)
    11 Precision
    12 Test report
    Annex A (informative) - Verification of temperature
            in the cylinder
    Annex B (informative) - Repeated MVR determinations on
            different materials carried out in line with
            this part of ISO 1133
    Bibliography

    Abstract - (Show below) - (Hide below)

    Defines a method for the determination of the melt volume-flow rate (MVR) and melt mass-flow rate (MFR) of thermoplastic materials that exhibit a high rheological sensitivity to the time-temperature history experienced by the sample during the test and/or to moisture.

    Scope - (Show below) - (Hide below)

    This part of ISO1133 specifies a procedure for the determination of the melt volume-flow rate (MVR) and melt mass-flow rate (MFR) of thermoplastic materials that exhibit a high rheological sensitivity to the time-temperature history experienced by the sample during the test and/or to moisture.

    NOTE1 Some grades of materials affected by hydrolysis are of, for example, poly(ethylene terephthalate) (PET), poly(butylene terephthalate) (PBT), poly(ethylene naphthalate) (PEN), other polyester types and polyamides; and by cross-linking are of, for example, thermoplastic elastomers (TPE) and thermoplastic vulcanizates (TPV). It is possible that this method will also be suitable for use with other materials.

    It is possible that this method will not be appropriate for materials whose rheological behaviour is extremely affected during testing (see Note2).

    NOTE2 For materials where the coefficient of variation of the MFR or MVR results is found to be higher than the precision mentioned in ISO1133-1, the viscosity number in dilute solution (ISO307, ISO1628) can be more appropriate for characterization purposes.

    NOTE3 Minor deviations from the equipment requirements, procedure and/or sample handling can result in considerable loss of reproducibility, repeatability and accuracy of the measurement. MVR results determined on different materials, indicating the repeatability of the test method of this part of ISO1133 when measured under ideal measurement conditions, are reported in AnnexB.

    MFR values can be determined by calculation from MVR measurements provided the melt density at the test temperature and pressure is known, or by measurement using a cutting device provided that the accuracy of the measurement is at least the same as that of the MVR measurement.

    NOTE4 The density of the melt is required at the test temperature and pressure. In practice, the pressure is low and values obtained at the test temperature and ambient pressure suffice.

    The primary difference between this part of ISO1133 and ISO1133-1 is that this part of ISO1133 specifies tighter tolerances on the temperature in the cylinder and on the time duration over which the material is subjected to that temperature. Thus the time-temperature history of the material is more tightly controlled and consequently, for materials that are likely to be affected by exposure to elevated temperatures, the variability of test results is reduced compared with whether the specifications of ISO1133-1 were used.

    This part of ISO1133 also provides information for preparation and handling of moisture sensitive materials that again are critical to obtaining repeatable, reproducible and accurate data.

    The test conditions for measurement of the MVR and MFR are often specified in the material standard. However, for those materials where there are no test conditions specified in the material standard, it is necessary for the test conditions to be agreed between the interested parties.

    General Product Information - (Show below) - (Hide below)

    Committee PRI/21
    Development Note Supersedes 09/30183439 DC. (01/2012) Together with BS EN ISO 1133-1, it supersedes BS EN ISO 1133. (03/2012)
    Document Type Standard
    Publisher British Standards Institution
    Status Current
    Supersedes

    Standards Referencing This Book - (Show below) - (Hide below)

    ISO 7391-2:2006 Plastics Polycarbonate (PC) moulding and extrusion materials Part 2: Preparation of test specimens and determination of properties
    ISO 1133-1:2011 Plastics Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics Part 1: Standard method
    ISO 14910-2:2013 Plastics Thermoplastic polyester/ester and polyether/ester elastomers for moulding and extrusion Part 2: Preparation of test specimens and determination of properties
    ISO 472:2013 Plastics Vocabulary
    ISO 307:2007 Plastics Polyamides Determination of viscosity number
    ISO 15512:2016 Plastics Determination of water content
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