... 4.Material: Natural Rubber Foam Natural Rubber Ball Sponge Ball SpecificationsNameCleaning Sponge BallSize (mm)DN 50/80/100/125/150/180 ... equipment. Sponge Ball Technological Data SheetMaterialNatural RubberLongevityExtended Life Rubber FormulaParting Strength380% to 440%Density200 kg/m3 - ... than 10 years, covering spiral wrap,rubber hose,rubber seal strip,gasket,rubber molding products, etc. Hope to ...