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Standard Test Method for Measurement of Average Viscometric Degree of Polymerization of New and Aged Electrical Papers and Boards
Přeložit název
NORMA vydána dne 1.11.2016
Označení normy: ASTM D4243-16
Poznámka: NEPLATNÁ
Datum vydání normy: 1.11.2016
Kód zboží: NS-668477
Počet stran: 7
Přibližná hmotnost: 21 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
aging, board, cellulose, cupriethylene-diamine, degree of polymerization, paper, pressboard, viscometry,, ICS Number Code 29.035.10 (Paper and board insulating materials)
Significance and Use | ||||||
5.1 This test method applies to all papers made from unmodified cellulose, as used in transformer, cable, or capacitor manufacture. It applies to new or aged papers. For information, Appendix X1 shows an example of statistical distribution of values for new papers intended for the insulation of transformers, together with information relative to cable and capacitor papers. Nevertheless, where evaluating the decomposition stage of aged papers, take care to use, as a reference, the value of the new paper of the very same origin; of new papers being a function, among other factors, of their specific gravity and of their manufacturing process. 5.2 This test method can also be used for the determination of the intrinsic viscosity of solutions of chemically modified papers, provided that these dissolve completely in the selection solvent. Use this test method with caution when it is applied to papers with mineral fillers. |
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1. Scope | ||||||
1.1 This test method describes a standard procedure for determining the average viscometric degree of polymerization (abbreviated ) of new or aged electrical papers. The determination is made by measuring the intrinsic viscosity of a solution of the paper in an appropriate solvent. 1.2 The degree of polymerization (or the degree of condensation) of a particular cellulose molecule is the number of anhydro-β-glucose monomers, C6H10O5, in the cellulose molecule. Within a sample of paper, not all the cellulose molecules have the same degree of polymerization so that the mean value measured by viscometric methods is not necessarily the same as that which are obtained by other methods. 1.3 This standard may involve
hazardous materials, operations, and equipment. This standard does
not purport to address all of the safety concerns, if any,
associated with its use. It is the responsibility of the user of
this standard to establish appropriate safety and health practices
and to determine the applicability of regulatory limitations prior
to use.
Standard Test Method for Kinematic
Viscosity of Transparent and Opaque Liquids (and Calculation of
Dynamic Viscosity) Standard Terminology Relating to
Electrical Insulation IEC 60450 Measurement of the Average Viscometric
Degree of Polymerization of New and Aged Electrical Papers
Available from American National Standards Institute (ANSI), 25 W.
43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org. |
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