(1) Product Description    Perforated ceramic ball is developed on the basis of inert ceramic ball .It has an adequate mechanical strength, chemical and thermal stability as the normal inert one; furthermore it has higher dispersion and flux of the fluids, more surface area and lower resistance resulting from the perforated holes on the ball body.  As a new efficient support and   covering material of catalyst. it has been widely used in oil refinery, chemical, fertilizer, natural gas and environmental   protection industries since put into market.     (2)  Technical Specification Type Feldspar Feldspar-Mullite Mullite Mullite-Corundum Corundum   Item Chemical composition % Al2O3 20-30 30-45 45-70 70-90 ≥90 Al2O3+SiO2 ≥90 Fe2O3 ≤1 Water absorption, % ≤5 Acid resistance, % ≥98 Alkali resistance,% ≥80 ≥82 ≥85 ≥90 ≥95 Thermal resistance ,℃ ≥1300 ≥1400 ≥1500 ≥1600 ≥1700 Crushing strength N/grain Φ３ ≥400 ≥420 ≥440 ≥480 ≥500 Φ６ ≥480 ≥520 ≥600 ≥620 ≥650 Φ８ ≥600 ≥700 ≥800 ≥900 ≥1000 Φ10 ≥1000 ≥1100 ≥1300 ≥1500 ≥1800 Φ13 ≥1500 ≥1600 ≥1800 ≥2300 ≥2600 Φ16 ≥1800 ≥2000 ≥2300 ≥2800 ≥3200 Φ20 ≥2500 ≥2800 ≥3200 ≥3600 ≥4000 Φ25 ≥3000 ≥3200 ≥3500 ≥4000 ≥4500 Φ30 ≥4000 ≥4500 ≥5000 ≥5500 ≥6000 Φ38 ≥6000 ≥6500 ≥7000 ≥8500 ≥10000 Φ50 ≥8000 ≥8500 ≥9000 ≥10000 ≥12000 Φ75 ≥10000 ≥11000 ≥12000 ≥14000 ≥15000 Bulk density, kg/m3 1100-1200 1200-1300 1300-1400 1400-1550 ≥1550 Note: The data of bulk density is given for reference only, not as the acceptance criterion.   (3) Size Diameter,Φ 6 8 10 13 16 20 25 30 38 50 60 75 Tolerance,mm ±1.0 ±1.5 ±2.0 ±3.0  Diameter of hole,mm 2-3 3-5 5-8 8-10   (4)  Product Standard》 Chemical Industry Standard HG/T3683.3-2000 Industrial Ceramic Ball – Perforated Ceramics ball