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Home Product for Battery Manufacturing Industries APG Expander
Offering 30 years of technical knowledge & experience
APG Expander is produced by blending various types and/or proportion of barium sulfate, carbon black, and Lignin (a wood derivative) to industry standards. Carbon black is added to give the negative plate a different color from the positive plate and also to lower the internal battery resistance and to add to internal plate conductivity. Lignin is added to increase battery capacity at low operating temperatures and high rates of discharge. Barium sulfate is added to extend the life of the negative plates. Automotive and industrial battery manufacturers mix the expander, Lead oxide, sulfuric acid, and water to make the negative plate paste.

The expander enhances the ability of the Lead-acid batteries to perform under various climatic conditions. In a typical automotive battery 1.0% to 2.0% expander is used in the negative plate oxide depending upon the climatic conditions for the battery. In industrial or deep cycle batteries 2.0% to 3.0% expander is added to the negative plate oxide.