... 1.material:good quality natural rubber 2.density: medium and hard 3.size:10-170 4 withstand high temperature Standard ... pipe,steel pipe,Titanium tube,etc.Technial data Sponge Ball Technological Data SheetMaterialNatural RubberLongevityExtended Life Rubber FormulaParting Strength380% ... with acids, alkalis, oils, fats and solvents. High quality rubber sponge cleaning ball for pipeline cleaning