A solid state reaction method for the production of tetrabasic lead
sulfate includes the steps of mixing a stoichiometric mixture of 5PbO and
(NH.sub.4).sub.2SO.sub.4 and heating the stoichiometric mixture of 5PbO
and (NH.sub.4).sub.2SO.sub.4 at a temperature between 500 and 700.degree.
C. for 3 to 8 hours. The method also includes the steps of
deagglomerating and sieving resulting tetrabasic lead sulfate.