外径D/mm | 160 | 180 | 200 | 225 | 250 | 280 | 300 |
内径d/mm | 110 | 125 | 140 | 150 | 155 | 165 | 175 |
厚度h/mm | 3.2 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 | 3.5 |
单位面积/cm2 | 106 | 132 | 160 | 221 | 302 | 402 | 466 |