... chemical corrosion materials, such as polyethylene(PE),polypropylene (PP),reinforced polypropyleneRPP,polyvinyl chloride(PVC), chlorides polyvinyl chloride(CPVC ... floating ball as follow FLOAT PP BALL(PP PURIFICATION BALL):Float PP Ball,also called pp purification ball, it is ... in acid container,acid fog seal airtightness.MATERIALS:Polypropylene(PP) ect.SPECIFICATIONS:ø40mm, weight:18g per piecesTo ...