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HIGH ALUMINA

GROUP

C. 700         C.800

SUB GROUP

780

 786 799

FEATURE OF COMPOSITION

AI203 75 - 80%

AI203 - 92%

AI203 - 99.5%

APPLICATION RANGE

Good electrical & mechanical properties,
 suited to general-purpose applications.

Good mechanical and thermo properties,
 combined with high
 wear resistance,
 suitable for rotating 
or sliding parts
 because of low 
coefficient of friction. 

Very good electrical & mechanical properties, high and wear resistance, suite for severe applications in all conditions.

Exceptional electrical and mechanical properties, superior chemical and textile application

                                                      PROPERTIES

COLOUR

 Pink / White Brown Pink White
POROSITY (Vol. %) - 0 0 0
BULK DENSITY (g/cm2) 3.40 3.40 3.65 3.90
HARDNESS (Mohs Scale) 8 8 9 9

  FLEXURAL
  STRENGTH
(N/mm2)

   Unglazed 200 200 260 370
  Glazed - - - -
MODULUS OF ELECTRICITY (103N/mm2) 200 200 240 360

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

 a20 - 1000c 7.10 6.35 7.10 7.10
a20 - 3000c 6.40 6.20 6.40 6.40
a20 - 6000c 7.35 7.15 7.35 7.35
a20 - 8000c 7.65 7.65 7.65 7.90
THERMAL SHOCK RESISTANCEMIN. (K) 140 140 150 150
SPECIFIC HEAT CAPACITY (20-100C) 850 to 900 850 to 1050 850 to 1050 850 to 1050
THERMAL CONDUCTIVITY (20-100C) 13 15 20 33
DIELECTRIC STRENGTH METHOD - 
method A (KV / mm)		 15 to 20 15 to 20 15 to 20 15 to 20
RELATIVE PERMITTIVITY (48 to 62Hz)  8.0 8.0 9.0 9.0
DISSIPATION 
   FACTOR AT 
   20C (103)		  48 - 62 Hz 1 1 0.5 0.4
1 KHz - - - -
 1MHz 0.8 0.8 0.4 0.3
   VOLUME
   RESISTIVITY
   IN TERMS OF
   TEMPERATUR
   E (D.C.)cm		 200C 1014 1014 1014 1014
2000C 1012 1012 1012 1012
6000C 107 107 108 108
 

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