Absorptive glass microfiber batteries

Separators are used to electrically insulate between positive and negative plates to prevent a short circuit. Separators are porous to allow acid transport into or ont of the plates. The common separators are microporous polyethylene (PE) or absorptive glass mat (AGM). AGM is a nonwoven fabric made with glass microfiber. It is used widely for VRLAs because it is highly porous (90% to 95%) and can absorb more acid and has small pore size to maintain electrolyte levels in battery. Table 1.11 shows the properties of battery separator materials. 

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