Astm D 3251 – 04 pdf free download

Standard Test Method for
Thermal Endurance Characteristics of Electrical Insulating
Varnishes Applied Over Film-Insulated Magnet Wire1

This standard is issued under the fixed designation D 3251; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of 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 covers the determination of the thermal
endurance characteristics of electrical insulating varnishes and
film-insulated magnet wire in combination.

1.2 The values stated in SI units are to be regarded as the
standard.

1.3 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 determine the applicability of regulatory limitations prior to use.NOTE 1—This test method is equivalent to IEC 60172.

2. Referenced Documents

2.1 ASTM Standards: 2
D 115 Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation
D 1711 Terminology Relating to Electrical Insulation
D 2307 Test Method for Thermal Endurance of FilmInsulated Round Magnet Wire

2.2 IEC Standard:
IEC 60172 Test Procedure for the determination of the
temperature index of enameled winding wires3