... 1.material:good quality natural rubber 2.density: medium and hard 3.size:16--25 4 withstand high temperature Standard ... pipe,steel pipe,Titanium tube,etc.Technical 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