ASTM B613-76(2012)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:B613 −76(Reapproved 2012)
Standard Guide for
Preparing Specifications for Miniature Brushes of
Composite Materials for Sliding Electric Contacts
This standard is issued under the fixed designation B613; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope E18Test Methods for Rockwell Hardness of Metallic Ma-
terials
1.1 This guide defines the criteria for composition,
E384Test Method for Knoop and Vickers Hardness of
properties, and other requirements for brushes containing a
Materials
matrix of one or more conducting metallic elements or alloys
2.2 ANSI Standard:
and one or more lubricating lamellar solids.
C64.1Brushes for Electrical Machines
1.2 The resulting specification is intended for use where the
3. Requirements
size (for example, 5 by 3 by 2 mm), shape, or other factors
preclude the determination of properties on specimens of the
3.1 Composition—Each constituent should be listed indi-
bulk material from which individual brushes are made.
vidually by weight percent including tolerances if mutually
agreed upon by producer and user. Any analytical technique
1.3 Therequirementsrecommendedhereinhavebeenfound
may be used as agreed upon between the producer and user.
to be desirable for most brush material composites. Care must
be taken in preparing a specification for a pre-existing material
3.2 Density—Anapparentdensityforthematerialshouldbe
that imposition of one or more provisions herein does not alter defined. The measurement and weight method defined by
the material or its performance.
ANSI C64.1 is preferred.
1.4 The values stated in SI units are to be regarded as 3.3 Resistivity—Theresistivityshouldbedefinedforatleast
standard. No other units of measurement are included in this one axis. The procedure defined by ANSI C64.1 may need to
standard. bemodified,asagreeduponbetweentheproduceranduser,for
very small brushes.
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3.4 Hardness—The bulk hardness of the brush material
1 1
responsibility of the user of this standard to become familiar
should be defined. Rockwell superficial hardness tests, ⁄8 or ⁄4
with all hazards including those identified in the appropriate
in.-ball, (Test Methods E18) and Knoop, 500-g load (Test
Material Safety Data Sheet (MSDS) for this product/material
Method E384) have been used.
as provided by the manufacturer, to establish appropriate
3.5 Strength—The strength of the brush material should be
safety and health practices, and determine the applicability of
defined.
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