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IEC 60450 Ed. 2.1 b:2007

Measurement of the average viscometric degree of polymerization of new and aged cellulosic electrically insulating materials
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IEC 60450 Ed. 2.1 b:2007

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

PUBLISH DATE 2007
PAGES 48
IEC 60450 Ed. 2.1 b:2007
Measurement of the average viscometric degree of polymerization of new and aged cellulosic electrically insulating materials
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. This consolidated version consists of the second edition (2004), and its amendment 1 (2007). Therefore, no need to order amendment in addition to this publication.
SDO IEC: International Electrotechnical Commission
Document Number IEC 60450
Publication Date July 1, 2007
Language b - English & French
Page Count
Revision Level 2.1
Supercedes
Committee 112
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