How Much Tin to add to W/W to get 2% ???

[Russ in WY]

Have some ¼ lb pure tin ingots , & 3 -10lb pots full of fluxed W/W.. To achieve the commonly recommended 2% Tin for good mold fillout , what would be the amount by weight that it will take ??? Math Gurue's to the rescue Pls.. Russ.

[semtav]

I come up with 3.2 oz per 10 lb

[Russ in WY]

Tks "semtav" , might just add the whole 4 oz ingot & call it Good... Russ..........

[Ole]

I would try it @ 1% and see if that's enough.

Some molds you don't need to add any tin.

Tin is expensive.

[bumpo628]

2.5 oz of pure tin added to 10 lbs of clip on WW gives you:
2.03% Tin, 1.97% Antimony, @ hardness 11

Although I don't think you actually need to go all the way up to 2% to get good mold fillout. I would just try casting a few as-is. If it doesn't work, add it a little at a time until you get up to 2.5 oz.

[shotman]

Kroil is cheaper than tin and it works

[runfiverun]

ww's usually have about .5 tin to begin with.
i only add tin when i need the alloy strength for hunting.
if you look closely at a ww it has little numbers/letters on it that were cast there.

[RobS]

Should you have a reloading scale then 7000 grains equals a pound. WW having about 1/2% of tin already.................1.5% of 7000 grains or 7000 X .015 = 105 grains

1% of 7000 grains or 7000 X .01 = 70 grains



measure out 105 grains for each pound of WW alloy which will yield 2% tin

or

measure out 70 grains for each pound of WW alloy which will yield 1.5% tin

etc. etc.

[RobS]

your 1/4 lbs tin ingots = 1750 grains


for 10 lbs of WW alloy (already has .5% tin) to reach a total of 2% you'll need 1050 grains of tin

for 10 lbs of WW alloy (already has .5% tin) to reach a total of 1.5% you'll need 700 grains of tin




Also, some more info: 437.5 grains = 1 ounce

That pretty much covers it I think, hope it helps.