... ISO, CE Certified Zircon Block 2) 20-Year Experience, 5,000 Tons/Year Output 3 ... ) One Week D.P. 4) Various Quality, Spec. Zircon Brick Spec. ZS-65ZS-64ZrO2(%)≥6564Fe2O3(%)≤0 ... Mpa )110100Softening Start Temperature Under Load(0.2MPa)(°C)≥16801670Refractoriness(°C)≥17901780 ABOUT ... Accurate size; 4) Long warranty time; 5) Crucial for energy saving, consumption reduction, ...