Classification temperature 12,601,400 Product code GLNC-289 GLNC-389 GLNC-489 GLNC-589 heating permanent change (%) 1000 ℃ × 24h≤-3 1100 ℃ × 24h≤-3 1200 ℃ × 24h≤-3 1350 ℃ × 24h ≤-3 theoretical thermal conductivity (W / mk) (mean 200 ℃) 0.045-0.060 (mean 400 ℃) 0.095-0.120 (mean 600 ℃) 0.160-0.195 theoretical bulk density (kg / m3) 200 + 10; 220 + 10 Product Specifications (mm) 300 × 300 × 200/250 AL2O3 (%) ≥45 ≥45 52 ~ 55 - Zr2 (%) - - - 15 ~ 17 AL2O3 + SiO2 (%) ≥97 ≥99 ≥99 - AL2O3 + SiO2 + Zr2 ( %) - - - ≥99 Fe2O3 (%) ≤1.0 ≤0.2 ≤0.2 ≤0.2 K2O + Na2O (%) ≤0.5 ≤0.2 ≤0.2 ≤0.2 form of packaging cartons / bags