This Standard specifies test procedures for determining the physical prop-
erties of brush materials for electrical machines, i.e. bulk density, hardness, resistiv-
ity, transverse strength and for determining the ash content.
NOTES 1 The properties determined by these tests are inherent in the brush
materials themselves as distinct from performance characteristics in
operation on electrical equipment.
It should be kept in mind that since brush materials are generally
brittle, porous materials, it is reasonable that their properties vary much
more than the same properties in metals.
Samples used for these tests shall be representative of the batch of
material involved using a recognized and/or agreed sampling procedure
or technique.
2 The International Standard corresponding to this Standard is as follows.
The symbols which denote the degree of correspondence between JIS
and the corresponding International Standard are IDT (identical), MOD
(modified), and NEQ (not equivalent) according to ISO/IEC Guide 21.
IEC 60413 : 1972 Test procedures for determining physical properties
of brush materials for electrical machines (MOD)
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JIS C 2820:2008 history
2008JIS C 2820:2008 Test procedures for determining physical properties of brush materials for electrical machines