Metallic packings mainly inclade carbonsteel, Aluminam alloy and stainless steel as materials owing to its thin wall, low resistance, high void and capacity, metallic packings have a high separation efficiency and are applied to handle the thermal sensitive, easy to separation and easy carbonized materials in the vacuum rectifying tower. Main specification Name Size Specific area α m2/m3 Void volume m3/m3 Number per volume n/m3 Bulk density kg/m3 Drying packing factor α/ε3 m-1 Casade ring 25×12.5 ×0.5 220 0.92 97160 383.5 257 38×19×0.8 154.3 0.94 31890 325 173 50×28×0.8 109.2 0.95 11600 308 123 Pall ring 16×16×0.3 362 0.93 171000 396 423 25×25×0.5 219 0.937 55900 393 269 38×38×0.6 146 0.945 13700 318 165 50×50×0.8 109 0.949 6500 314 124 76×76×1 71 0.952 1765 308 80 Vsp ring 38×38×0.6 138 0.947 14500 296 163 50×50×0.8 121 0.95 7000 350 144 Conjugate ring 25×25×0.3 185 0.953 75001 311.7 216 38×38×0.5 116 0.957 19500 275 131 50×50×0.8 86 0.966 9772 275 97 76×76×1 81 0.948 3980 246 94.5 Uramic intalox 25×20×0.6 185 0.96 101160 119 38×30×0.8 112 0.96 36600 365 50×40×1 74.9 0.96 10400 291 76×60×1.2 57.6 0.97 3320 244.7 184 Intalox 25×15×0.3 171 0.960 81620 188 132 38×16.5×0.4 123 0.972 35800 181 83 50×29×0.5 79 0.972 12133 141