Why were wooden separators originally used in batteries?

Wood is naturally porous, allowing battery electrolyte (acid) to flow between plates while providing a solid physical barrier that prevents positive and negative plates from short-circuiting.

What has replaced wooden separators in modern applications?

Microporous polymers (like PE and PVC) and Absorbed Glass Mat (AGM) have replaced wood due to better chemical resistance, lower electrical resistance, and longer lifespan.

IS 652

: 1960

Wooden Separators for Lead-Acid Storage Batteries

CurrentRareSpecificationMaterials Science · Wood and Other Lignocellulosic Products

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This standard specifies the physical, chemical, and electrical requirements for wooden separators used in lead-acid storage batteries. It details the selection of suitable timber species, necessary chemical treatments to remove harmful organic acids, and permissible tolerances to ensure proper electrical insulation and electrolyte permeability.

Wooden Separators for Lead-Acid Storage Batteries

Practical Notes

Wooden separators are virtually obsolete in modern battery manufacturing, having been entirely superseded by synthetic materials like microporous polyethylene (PE) and Absorbed Glass Mat (AGM).

When referring to this code for historic restoration or specialized legacy applications, ensure the timber is thoroughly treated; untreated wood contains acetic acid which rapidly degrades lead plates.