ISO 307
Plastics - Polyamides - Determination of viscosity number
Organization: | ISO |
Publication Date: | 1 July 1977 |
Status: | inactive |
Page Count: | 9 |
ICS Code (Thermoplastic materials): | 83.080.20 |
scope:
SCOPE AND FIELD OF APPLICATION
This International Standard specifies a method for the determination of the viscosity number (see annex A) of a dilute solution of polyamide in formic acid or metacresol. This method is applicable only to those resins that give stable solutions and reproducible results under the specified conditions of test.
If a monomerl ) is known to be present in the sample, the amount should be determined by the procedure described in ISO/R 599 and reported. The presence of monomer affects considerably the determination of viscosity number of certain types of polyamide. If the sample contains an additive or a filler, which would affect the viscosity measurement, it should be removed by a procedure agreed between the interested parties.
This method is meant to give an insight into the molecular structure of polyamides and to allow the comparison of different types.
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