BS EN ISO 9371:1995 Plastics. Phenolic resins in the liquid state or in solution. Determination of viscosity
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This International Standard specifies four methods for the determination of the viscosity of phenolic resins, either as a liquid or in solution.
It describes the following two types of method:
a) Reference methods:
1) Determination using a viscometer with a definite speed gradient
2) Determination using an Ubbelohde capillary viscometer
b) Comparative test methods:
1) Determination using a rotary viscometer
2) Determination using a tioeppler dropping-ball visçometer
Other methods may be used as long as it is verified that the same test results are obtained.