IEC 60464-2-2014 pdf free.Varnishes used for electrical insulation – Part 2: Methods of test.
Unless otherwise specified in the relevant specification standard, or in the method of test, all tests shall be carried out at atmospheric conditions in a temperature of (25 ± 4) °C and a relative humidity range between 45 % to 70 %. Before measurements are made, the sample or test specimen shall be pre-conditioned under these atmospheric conditions for a time sufficient to allow the sample or the test specimen to reach stability. For taking samples in liquid or paste form, ISO 15528 shall be applied. For preparation of such samples for testing, ISO 1513 shall be applied.
NOTE For definitions of terms for standard atmospheres. see ISO 558. The test atmosphere as specified above does not comply with any of the two standard atmospheres as specified in ISO 291 but covers both ranges inclusive of their tolerances.
Normally, all mandatory requirements for a method of test are given in the description, and diagrams are intended only to illustrate one possible arrangement for conducting the test. In case of inconsistencies between this standard and the specification sheets of IEC 60464-3, the latter shall prevail.
When another standard is invoked for a test method, reference to that standard shall be included in the report.
5 Methods of test for undried and/or uncured varnishes
The materials before drying and/or curing are varnishes in their original liquid state.
5.1 Flashpoint
For flashpoint temperatures of 79 °C and above, the method given in ISO 2592 shall be used. For flashpoint temperatures below 79 °C. the method given in ISO 1523 shall be used with any of the closed-cup apparatus as described in annex A of that standard. ISO 1523 shall be read in conjunction with ISO 3679.
Two measurements shall be made on two separate samples and the two results of flashpoint shall be reported.
5.2 Density
The method given in ISO 2811 shall be used. Two measurements shall be made and the two results of density shall be reported.
5.3 Viscosity
The viscosity shall be determined with a suitable device at (23 ± 0,5) °C. If a rotating type of device is used, it shall be in accordance with ISO 2555 (Brookfield type) or with ISO 3219 (a type working at defined shear rate). If an efflux type of equipment is used, the method of test and the flow cup shall be in accordance with ISO 2431.
Two measurements shall be made and the two results of viscosity shall be reported.
5.4 Content of non-volatile matter
The method given in ISO 3251 shall be used. Two measurements shall be made and the two results of the content of non-volatile matter shall be reported.
5.5 Dilution ability
Dilution ability is expressed by the amount of solvent and/or diluent which can be added to the varnish until cloudiness or separation is observed.
5.5.1 Procedure
A varnish sample of (50 ± 1) ml shall be poured into a glass cylinder of about 250 ml volume. Solvent and/or diluent as agreed between supplier and purchaser shall be added in defined portions of for instance (10 ± 0,2) ml until cloudiness or separation is observed. After each addition, the content of the glass cylinder shall be properly stirred to obtain a homogeneous mixture and shall be allowed to settle for at least 5 mm and not more than 10 mm.
5.5.2 Result
One measurement shall be made and the type of solvent and/or diluent and the percentage in volume added without appearance of cloudiness or separation shall be reported.IEC 60464-2 pdf download.