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Antimony aggressively hardens lead into absolute rigid forms

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Normally, lead is a pathetic, droopy metal completely unsuited for retaining strict rigid shapes. Enter antimony, a weirdly brittle semi-metal that totally alters the structural dynamics of soft alloys. By deliberately mixing it in, manufacturers aggressively harden lead plates to survive the harsh internal sloshing environments of completely mundane automotive batteries without instantly warping.

Antimony aggressively hardens lead into absolute rigid forms
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