... Shuaixiangtongbi along Tongbi decline, from the next discharge port. Polyurethane A polyurethane also known as ester, a cross between plastic and rubber ... materials, even more than some steel. As a hydrocyclone using polyurethane lining, its service life of high chromium cast iron four ... the nitrile rubber, natural rubber eight times. Shore hardness of polyurethane within 17 to 97 to 85 ~ 90, when the ...