... ISO9001:2000 size:25-50mm material: PP available for stripping, absorbing and washing Plastic tower ... packings are made from polyethylene(PE),polypropylene(PP),reinforced polypropylene(RPP),polyvinyl chloride (PVC),chlorinated polyvinyl chloride ... (CPVC)and polyvinylidene fluoride(PVDF).PP Hollow Ball have a strong resistance to chemical corrosion, ...