What do have here?

[Dadswickedammo]

So got a bunch of these today name is Kester
Markings 1lb, QQ-S-571F, Sn63Pb37, LOT#489957.
It Thuds when dropped harder then pure lead.
187086

[BrutalAB]

Gonna take a guess and say 63% tin 37% lead.

[Soundguy]

Yup.. Solder.

Kester makes solder, and the numbers call out its alloy %

[Silvercreek Farmer]

Nice score! What'd you give for it?

[NyFirefighter357]

Bar solder 63% tin 37% lead

[Dadswickedammo]

Yup after rooting around the innerweb found it.

[runfiverun]

that's all I used to buy, was those bars.
1 bar to 100 lbs of ww's gives you another 1% Tin.

I could get a box of 25 of them for 75$ back in the day.

[Oklahoma Rebel]

is the 571f the melting point in farenheit? spl?

[Soundguy]

63/37 should melt at 361'F