Formation of Tetrabasic Lead Sulfate at Room Temperature

Abstract

A study was made of the formation of tetrabasic lead sulfate, 4PbO 9 PbSO4, in oxide-sul fate mixtures between room temperature and 80 ~ for reaction times of up to 4 weeks. Under certain conditions it is a reaction product a room temperature, a finding contrary to the general ly held view that this compound can form only above 70~ Tetrabasic lead sulfate, 4PbO.PbSO4, is, in some cases, a major component in the cured paste of a lead-acid battery plate. In our experience its presence en-hances the mechanica l strength of the paste, perhaps due to the inter locking of its rodl ike crystals. This would not only better preserve the integrity of the plate during the manufactur ing process, but it might contribute to a longer cycle life in battery service. Thus, according to Burbank: (1), the transformation of