introduction
ISO (International Organization for Standardization) is a global alliance of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member institution interested in a subject on which a technical committee has been established has the right to be represented on that committee. International governmental and non-governmental organizations liaising with ISO are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrical standardization.
The draft international standard adopted by the Technical Committee will be circulated to the member bodies for voting. Publication as an international standard requires approval by at least 75% of member institutions.
The international standard ISO 9396 was developed by the Technical Committee ISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting Materials.
The second edition cancelled and replaced the first edition (ISO 9396:1989), where method A (using a rotary stirrer) was removed and a precision clause was added.
Step 1: Scope
This standard specifies a method for determining the gel time of phenolic resins under specified conditions at a given temperature using an automatic device. The test temperatures were 100°C, 130°C and 150°C.
The specified method uses a plunger drive to perform reciprocating vertical motion.
The method is suitable for the following types of phenolic resins:
– Liquid sol
ISO 9396-1997 “Determination of the gel time of plastic phenolic resins using automated equipment under specific conditions”
– Low melting point solid dissolver
Powdered resins with short gel times, such as a mixture of phenolic varnish and hexamethylenetetramine, are not suitable for this type of determination. This resin cross-links once fusion begins and becomes too sticky in a test tube to give meaningful results. Resins containing large amounts of low boiling point solvents are particularly unsuitable for this type of determination. For this resin, a boiling and distillation process occurs as the resin hardens.
It may be interesting to determine how long it takes for the resin to gel in the presence of a catalyst. The catalyst shall be added in clearly specified proportions. The type of catalyst used and its treatment shall be described in the test report.
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