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Significance and Use
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.
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D202 Test Methods for Sampling and Testing Untreated Paper Used for Electrical Insulation
D774/D774M Test Method for Bursting Strength of Paper
D828 Test Method for Tensile Properties of Paper and Paperboard Using Constant-Rate-of-Elongation Apparatus
D1030 Test Method for Fiber Analysis of Paper and Paperboard
D1126 Test Method for Hardness in Water
D1193 Specification for Reagent Water
D2176 Test Method for Folding Endurance of Paper by the M.I.T. Tester
D2576 Method of Test for Metals in Water and Waste Water by Atomic Absorption Spectrophotometry
D3376 Test Methods of Sampling and Testing Pulps to be Used in the Manufacture of Electrical Insulation
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
ICS Number Code 85.040 (Pulps)
UNSPSC Code 14101501(Paper pulp)
ASTM D3376-88(2009), Standard Test Methods of Sampling and Testing Pulps to be Used in the Manufacture of Electrical Insulation, ASTM International, West Conshohocken, PA, 2009, www.astm.orgBack to Top