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Friday, August 04, 2006

High Resistance Materials Tables

Liquids

20 C OHM -M
min max
Benzene 1011 1012
Transformer oil 1010 1013
Gasoline 1010 1013
Castor oil 108 1010
Acetone 104 105
Ethanol 104 105
Distilled water 103 104


Glass At High Temperature

200 C OHM -M
Sodium Pyrex 2 * 106
Potassium Pyrex 8 * 109
Lead glass 2 * 1011

Effect Of Contamination On Surface Resistivity

70% RH CONTAMINATED CLEAN
Window glass 2 * 108 1012
Fused quartz 2 * 108 1013


Relation Of Resistivity With RH % And Temp

MATERIAL 70% RH 20 deg C 0% RH 100 deg C 0% RH 20 deg C
Marble 106 - 108 1010 - 1012 1012 - 1014
Wood 106 - 107 1010 - 1012 1011 - 1013
Vulcanized fibers fibers 106 - 109 108 - 109 1011 - 1012
MATERIALS SOLIDS OHM -M


Solids

MATERIALS OHM -M
Polyethylene 1017
Poly propylene 1017
PVC 1018
Polyurethane 1015
Asbestos fiber + phenol 108
Mica + phenol 1012
Glass-fiber + polyester 1012
Glass-fiber + epoxy 1014

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