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ASTM D3376-88(2009)

Current Reaffirmation

Standard Test Methods of Sampling and Testing Pulps to be Used in the Manufacture of Electrical Insulation

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1.1 These test methods cover the sampling and testing of cellulosic pulps for use in the manufacture of electrical insulating papers and boards or in the direct application of pulp fibers as insulation to electrical conductors.

Note 1—The significance of any one pulp property test method, as set forth herein, should be considered with discretion depending on the product made from the pulp.

1.2 Sections on Reagents, Sampling, and Report are integral parts of each of the individual test methods that follow.

1.3 Each test method is described as being a measure of either a bulk property of the pulp or a property of a handsheet formed from the pulp.


The conductivity of the water extract of electrical grade pulp results from electrolytic impurities in the pulp which may be present as ionizable acids, bases, salts, or a combination of these. The presence of electrolytic impurities in electrical insulation is undesirable as they tend to lower insulation resistance and have corrosion-producing tendencies under conditions of applied potential. When comparing test data it should be noted that the extract conductivity of pulps, especially those of high purity, may change with time after manufacturing. This test is useful for routine acceptance testing, the comparison of different pulps, and research work.

SDO ASTM: ASTM International
Document Number D3376
Publication Date Oct. 1, 2009
Language en - English
Page Count 10
Revision Level 88(2009)
Supercedes
Committee D09.19
Publish Date Document Id Type View
Nov. 1, 2018 D3376-18 Revision
Nov. 1, 2014 D3376-14 Revision
Oct. 1, 2009 D3376-88R09 Reaffirmation
Sept. 1, 2005 D3376-88R05 Reaffirmation
April 10, 2000 D3376-88R00 Reaffirmation