Density(g/cm3)
2.2
Pressive strength (N/mm2)
1100
Buckling strength
67
Tensile strength
48
Micro strength
8600-9800
Mahs hardness
5.5-6.5
Chemical properties
HNO3
Specific gravity 1.4g/cm³, (2h, 20℃)
5*10-8
HCL
Specific gravity 1.19g/cm,(2h, 20℃)
15*10-8
NaOH
1%g/cm3(2h,110℃)
166*10-6
KOH
1%g/cm3(2h,98℃)
68*10-6
Coefficient of thermal expansion
5.5*10-7/℃
Thermal conductivity(w/m℃,20℃)
1.4
Specific heat
670
Soft point(viscosity 108Pa.S)
1680℃
Softening point (viscosity 1013Pa.S)
1215℃
Strain temperature (long time heat retaining)
1200℃
Long time operating temperature
1100℃
Short time operating temperature
1300℃
Resistivity (350℃. Ω.cm)
7*107
Insulation strength(20℃,KV/cm)
250-400
Dielectric constant ξ(F/m)
3.7