Parameters of Cascade RingMaterial Specification Speicific Area Void Ratio Number Bulk Tensity Dry Packing Factor D×H×δ α ε n γρ α/ε3 mm m2/m3 m3/m3 m-3 kg/m3 m-1 Plastic Cascade Ring 16×8.9×1.0 370 0.85 299136 135.6 602.6 25×17.5×1.0 228 0.9 81500 65.2 312.8 38×19×1.2 132.5 0.91 27200 54.5 175.8 50×25×1.5 114.2 0.927 10740 49.2 143.1 76×38×2.6 90 0.929 3420 63.5 112.3 Metallic Cascade Ring 25×12.5×0.6 220 0.92 97160 439 273.5 38×19×0.8 154.3 0.94 31890 475.5 185.8 50×28×1 109.2 0.95 11600 400 127.4 Ceramic Cascade Romg 30×21×3 132 0.68 46200 650 50×30×5 109.6 0.72 8980 580 120 80×45×7 60 0.69 3900 506 105 Plastic Cascade Ring