To reduce the leakage of electrolyte from alkaline cells, bitumen battery grade is used between the gasket and the metal surface. Typically asphaltic compounds such as bitumen are used. However, such seals are only marginally satisfactory, and then only when the steel cans are plated with nickel. When the steel can is unplated, such seals are very poor. The poorer seals noticed with unplated steel cans are probably due to differences in the bonding strength of bitumen to steel and bitumen to nickel-plated steel.
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