Document QXwaXdnm7J9XLNdqoZXp4zYb4
CUTLER HAMMER
MILWAUKEE . .WISCONSIN
MATERIAL-PART-PROCESS STANDARDS
The basic content of this standard was established by the
. Insulation Committee May 19$?.
_________ Last reviewed June 1969.
. '
.
. . INSULATING PANEL MATERIALS
;
Note: Steel panels are preferred fo insulating panel materials if the n>OLrnted units can be applied. All AC comporients^ihrou&h
' sfeeTlSJ~on<i most I^CTcomponent's"c^en be rnoun/ec/ on steel panel's. ~
~ .
.
'
A. PREFERRED TYPES AND COMPARATIVE PROPERTIES
TYPE
CHSPEC NO.
RELATED CH PROCESSING FORROLA
.. .
RECOMMENDED APPUCATIOHS :
*
MONSON SLATE .
ASBESTOS EBONY
CH <22-1 CH 421-1
50-33-1A 50-33-1C
50-33-1E
.
OHMSTONE CH 423-1
. 50-33-1B
- - Xfoe- S^--33-4 C-wJ>ore siai-o -is-preferrcd-bui-chr>-~ atone is eecepfeMe,.
This material is preferred for all applications except insulating bases,
Marine and Navy control and a few exceptions listed below.
`
Use for Marine control and insulating bases. Use Tot general purpose ap plications where more shock resistance is required than slate will provide.
Do cot use for rheostats, steel mill, Mery, oil Immersed contactors or where arc tracking Is a problem.
Use only wheo specified by customer, or when duplicating a previous ap plication which used bhmstooe. Do not use where there is a problem of --heaV^obovo-BD-OrCoid flowv or-arc tracking, bo-not -use-for-'etaae, fiavyv Marine or fire pump, control.
` Comparative Properties
:
ASBESTOS EBOHY CH 421-1
OHMSTOHfc CH 423--1
MOVtSQN SLATE . CH 422--1 .
Density: Water absorption: '
lbs/co inch % increase weight
'
.074 1.17
. .069 - 2.61 . '
.101 * `..106 . '
Modulus of rupture:
. pat minimum '
4060
, 3800
8400
impact dUeogth: {shock resistance)
Perpendicular to the long axis' inch lbs'.
Parallel to long axis
inch lbs
T^tt^CT&ture limitation:
- .F
1 Arc resistance:
.
Seconds ,
' 32 ' 40
. 250 F - : 120
..
.32 28 .
' .
' 17S F- .
|
, ... 230 . . . 1'
20.8 74.0 .
.
Ho practical limit
.Ho failure .
.
B. PREFERRED SUES AND AVAILABLE PART NUMBERS
FOR ASBESTOS, EBONY AND OHMSTONE
FOR SLATE
SC-EEI-1000