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Significance and Use
Apparent density affects the dielectric and physical characteristics of insulating board and is a factor in the economics of its use in apparatus. This test is useful for specification, design, and quality control purposes.
1.1 These test methods cover the sampling and testing of electrical insulating boards. These boards are porous, usually fibrous sheets used for dielectric and structural purposes in electrical apparatus.
1.2 These test methods are not intended for testing vulcanized fibre or molded laminated sheets.
1.3 These test methods are applicable to board materials having a nominal thickness of at least 0.030 in. (0.76 mm).
Note 1—For materials thinner than 0.030 in. (0.76 mm) see Test Methods D202.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
D202 Test Methods for Sampling and Testing Untreated Paper Used for Electrical Insulation
D374 Test Methods for Thickness of Solid Electrical Insulation
D586 Test Method for Ash in Pulp, Paper, and Paper Products
D644 Test Method for Moisture Content of Paper and Paperboard by Oven Drying
D664 Test Method for Acid Number of Petroleum Products by Potentiometric Titration
D685 Practice for Conditioning Paper and Paper Products for Testing
D877 Test Method for Dielectric Breakdown Voltage of Insulating Liquids Using Disk Electrodes
D924 Test Method for Dissipation Factor (or Power Factor) and Relative Permittivity (Dielectric Constant) of Electrical Insulating Liquids
D971 Test Method for Interfacial Tension of Oil Against Water by the Ring Method
D974 Test Method for Acid and Base Number by Color-Indicator Titration
D1169 Test Method for Specific Resistance (Resistivity) of Electrical Insulating Liquids
D1500 Test Method for ASTM Color of Petroleum Products (ASTM Color Scale)
D1816 Test Method for Dielectric Breakdown Voltage of Insulating Oils of Petroleum Origin Using VDE Electrodes
D2413 Practice for Preparation of Insulating Paper and Board Impregnated with a Liquid Dielectric
D2865 Practice for Calibration of Standards and Equipment for Electrical Insulating Materials Testing
D3426 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials Using Impulse Waves
D3455 Test Methods for Compatibility of Construction Material with Electrical Insulating Oil of Petroleum Origin
D3487 Specification for Mineral Insulating Oil Used in Electrical Apparatus
D3636 Practice for Sampling and Judging Quality of Solid Electrical Insulating Materials
D4243 Test Method for Measurement of Average Viscometric Degree of Polymerization of New and Aged Electrical Papers and Boards
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
TAPPI StandardT 413 Determination of Ash in Paper Available from Technical Association of the Pulp and Paper Industry (TAPPI), 15 Technology Parkway South, Norcross, GA 30092, http://www.tappi.org.
ICS Number Code 29.035.01 (Insulating materials in general)
UNSPSC Code 31371001(Insulation boards)
ASTM D3394-94(2009), Standard Test Methods for Sampling and Testing Electrical Insulating Board, ASTM International, West Conshohocken, PA, 2009, www.astm.orgBack to Top