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? ?Items ?? Indexes
NG
-1.5 NG
-1.3a NG
-1.3b NG
-1.0 NG
-0.9 NG
-0.8 NG
-0.7
????g/cm3???
Density g/cm3 no more than
1.5 1.3 1.3 1.0 0.9 0.8 0.7
??????kgf/cm3???
Compressive strength at normal temperature kgf/cm3 no less than
60 45 40 30 25 25 20
????????2%??????
Test temperature at which linear variation after burning is no more than 1400 1400 1350 1350 1300 1250 1250
????W/(m.k)(????350±25?)
Coefficient of thermal conductivity w/(m.k)(average temperature (350±25?) 0.70 0.60 0.60 0.50 0.40 0.35 0.35
