用于外壳和螺杆转子的标准结构材料和延展性铁
采用特氟龙涂层的内部和 Viton O 密封垫圈。

● 特殊涂层 – 涂有特氟纶(PFA)、镍或者铬
● However, the followings are also available ;
-Special O-ring such as Kalrez, Teflon
-Special Mech, Seals like Hastelloy, Ni-resist