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PORCELAIN

GROUP

C. 100

SUB GROUP

110

111 120 130

FEATURE OF COMPOSITION

AI2O3 < 30%

AI2O3 < 30%

AI2O30 - 50%

AI2O> 50 %

APPLICATION RANGE

L.V. and H.V.
insulation , good mechanical properties, suited for small middle and large-sized insulators.

L.V. insulation, small and middle sized insulators, suited  for complicated pressed pieces & Resistors and rheostats.

L.V. and H.V. insulation, high mechanical strength, good thermal shock resistance, suited for small, middle and large - sized insulators.

L.V. & H.V. insulation, excellent mechanical and thermal properties, suited for small. Middle and large sized insulators.

                                                      PROPERTIES

COLOUR

White Special 
Purpose 
White
White Grey White / Grey
POROSITY (Vol. %) 0 0 0 0 0
BULK DENSITY (g/cm2) 2.30 2.40 2.50 2.50 2.70
HARDNESS (Mohs Scale) 7 to 8 7 to 8 7 to 8 7 to 8 7 to 8

  FLEXURAL
  STRENGTH
(N/mm2)

  Unglazed 60 40 100 100 140
  Glazed 70 50 120 120 160
MODULUS OF ELECTRICITY (103N/mm2) 60 - 80 80 100

THERMAL
EXPANSION
LINER
COEFFICENT
(10-6 K-1)

a20 - 1000c 4.15 4.15 4.90 4.90 5.60
a20 - 3000c 4.50 3.90 4.75 4.75 5.35
a20 - 6000c 4.55 4.60 5.95 5.95 6.45
a20 - 8000c 5.10 4.50 5.70 5.70 6.45
THERMAL SHOCK RESISTANCEMIN. (K) 150 150 150 150 150
SPECIFIC HEAT CAPACITY (20-100C) 800 to 900 800 to 900 800 to 900 800 to 900 800 to 900
THERMAL CONDUCTIVITY (20-100C) 2.0 2.0 2.5 2.5 2.8
DIELECTRIC STRENGTH METHOD - 
method A (KV/mm)
20 -
-
20 20 20
RELATIVE PERMITTIVITY (48 to 62Hz)  6.0 - 6.5 6.5 6.5
DISSIPATION 
   FACTOR AT 
   20C (103)
 48 - 62 Hz 25 - 25 25 30
1 KHz - - - 12 -
 1MHz 12 - 12 - 15
   VOLUME
   RESISTIVITY
   IN TERMS OF
   TEMPERATUR
   E (D.C.)cm
200C 1013 1012 1013 1013 1013
2000C 108 108 108 108 108
6000C 104 104 104 104 104
 

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