IEC 60450:2004 ED2

Measurement of the average viscometric degree of polymerization of new and aged cellulosic electrically insulating materials

Publication date:   Apr 19, 2004

General information

60.60 Standard published   Apr 19, 2004

IEC

TC 112 Evaluation and qualification of electrical insulating materials and systems

International Standard

17.220.99   Other standards related to electricity and magnetism | 29.035.01   Insulating materials in general

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Scope

Describes a standardized method for the determination of the average viscometric degree of polymerization (DPv) of new and aged cellulosic electrically insulating materials. It may be applied to all cellulosic insulating materials such as those used in transformer, cable or capacitor manufacturing.
The methods described can also be used for the determination of the intrinsic viscosity of solutions of chemically modified kraft papers, provided that these dissolve completely in the selected solvent.
Caution should be taken if the method is applied to loaded kraft papers.
Note: Within a sample of material, all the cellulose molecules do not have the same degree of polymerization so that the mean value measured by viscometric methods is not necessarily the same as that which may be obtained by, for instance, osmotic or ultra centrifuging methods.
Experience has indicated the need for improved description of the experimental method. It describes a revised procedure that overcomes the limitations of the first edition.

Life cycle

PREVIOUSLY

Revises
IEC 60450:1974 ED1

NOW

PUBLISHED
IEC 60450:2004 ED2
60.60 Standard published
Apr 19, 2004

CORRIGENDA / AMENDMENTS

Amended by
IEC 60450:2004/AMD1:2007 ED2