... polyvinyl chloride (PVC),chlorinated polyvinyl chloride(CPVC)and polyvinylidene fluoride(PVDF).PP Hollow Ball have a strong resistance to ... , Conjugate ring, HQM flat ring, Teller Rosetter ring, Hollow ball, Polyhedral ball, Cage ball and Covering ball,HQR ... ring.Characteristic Indexes of Plastic hollow ball NameNormalmmDiameter×Height×ThicknessmmSurface aream2/m3Void space%Bulk ...