... 4 withstand high temperature RUBBER SONGE CLEANING BALLIntroduction1. Material: natural rubber2. Diameter: 6-175mm3. Hardness: soft,medium,hard ... pipe,steel pipe,Titanium tube,etc.Techincal data Sponge Ball Technological Data SheetMaterialNatural RubberLongevityExtended Life Rubber FormulaParting Strength380 ... acids, alkalis, oils, fats and solvents. rubber sponge cleaning ball for pipeline cleaning