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Hardening Lead
Basic Rules for Hardening Lead
For every 1% additional tin, Brinell hardness increases 0.29
For every 1% additional antimony, Brinell hardness increases 0.92
Sample equation:
Brinell = 8.60 Brinell Pure Lead + (0.29 * Tin percentage) + (0.92 * Antimony percentage)
If you increase the amount of tin by 10% and the amount of antimony 5%, the brinell hardness of your lead will be 16.1
Brinell hardness 16.1 = 8.60 + (0.29 * 10) + (0.92 * 5)