The technical keys of manufacturing large high - lowpressure combined rotors are selecting optimum chemical compositions, refining , forging and special heattreatment.
制造大型高低压复合转子的技术难点是：选择最佳的化学成分精炼、合理的锻造工艺和采用特殊的热处理方法。
2
Woven glass: incinerators, steels and iron plants, high heat resistance, dust collection efficiency, lowpressure drop, long life time (membrane laminated treatment).
玻璃纤维织物：焚化炉，钢铁工厂；高抗热性，集尘效率高，低压降，使用寿命长(压膜处理)。
3
It is made of high aluminium content grog, magnesite and graphite with a little additives, shaped at high pressure and then through heattreatment at low temperature.