The pistion ring of volumetric injection pump use different material of silicone,polyflon or other kinds according to liquid characteristic,use ceramic pump in special industry.

• 柱塞式计量泵活塞环材质根据行业及液体成分的不同采用硅橡胶、四氟乙烯或其他材质，特殊场合采用陶瓷材质。