The ball is a kind of inertia alumina catalyst support, covering packing, inert chemical properties of alumina ball stability, Acid and Basic Resistance Properties good, high strength, changes in the furnace ammonia conversion furnace, the hydrogen petrochemical installations, hydrogen peroxide devices,: HG/T3680.1-2000 Geometric parameters Long Rock feldspar - mullite based mullite based mullite - just pressure of Corundum 20-30 30-45 45-70 70-90 ≥ 90 Water absorption% ≤ 5 Acidproof degrees% ≥ 98 Alkaline degrees% ≥ 80 ≥ 82 ≥ 85 ≥ 90 ≥ 95 Resistance temperature radical change ℃ ≥ 130 ≥ 200 ≥ 500 ≥ 700 ≥ 800 Compressive strength N /颗Φ3 ≥ 0.12 ≥ 0.14 ≥ 0.14 ≥ 0.16 ≥ 0.20 Φ6 ≥ 0.40 ≥ 0.42 ≥ 0.44 ≥ 0.48 ≥ 0.50 Φ8 ≥ 0.48 ≥ 0.52 ≥ 0.60 ≥ 0.62 ≥ 0.65 Φ10 ≥ 0.60 ≥ 0.70 ≥ 0.80 ≥ 0.90 ≥ 1.00 Φ20 ≥ 1.80 ≥ 2.00 ≥ 2.30 ≥ 2.80 ≥ 3.20 Φ25 ≥ 2.50 ≥ 2.80 ≥ 3.20 ≥ 3.60 ≥ 4.02 Φ30 ≥ 3.00 ≥ 3.20 ≥ 90 ≥ 3.50 ≥ 4.50 Φ50 ≥ 6.00 ≥ 6.50 ≥ 7.00 ≥ 8.50 ≥ 1.00 Accumulation weight kg/m3 1300-1400 1400-1500 1500-1600 1600-1800> 1800