Astm D 4243 – 99 pdf free download

Standard Test Method for
Measurement of Average Viscometric Degree of
Polymerization of New and Aged Electrical Papers and
Boards1

This standard is issued under the fixed designation D 4243; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

1. Scope

1.1 This test method describes a standard procedure for
determining the average viscometric degree of polymerization
(abbreviated DPv ) 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
anhydrous-b-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 may be 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. See Section 9

2. Referenced Documents

2.1 ASTM Standards:
D 445 Test Method for Kinematic Viscosity of Transparent
and Opaque Liquids (the Calculation of Dynamic Viscosity)2
D 1711 Terminology Relating to Electrical Insulation3

2.2 Other Document:
IEC Publication 450 Measurement of the Average Viscometric Degree of Polymerization of New and Aged
Electrical Papers4