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. Scope

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 1For 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.

ASTM Standards

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 Standard

Keywords

aqueous extract characteristics pH; ash content; compressibility; conditioning; conductivity; degree of polymerization; dielectric strength; dimensions; electrical insulating board density; impulse dielectric strength; moisture content; oil absorption; shrinkage; tensile properties; Aqueous extract characteristics pH; Compressibility; Conductance and conductivity (electrical); Density--apparent (bulk); Dielectric breakdown voltage; Electrical insulating paper/paperboard; Oil absorption; Sampling electrical inisulating materials; Shrinkage;

ICS Code

ICS Number Code 29.035.01 (Insulating materials in general)

DOI: 10.1520/D3394-94R09

ASTM International is a member of CrossRef.

ASTM D3394