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Thread: Some odd solders found

  1. #1
    Boolit Master
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    Some odd solders found

    regular 1# thin (1/4 - 3/8 inch or so) flat bar solder. One type labeled 2-5/8% and the other type labeled No 20.

    I figured the 20# at $20 was worth it for solder even if not especially rich solder. But was wondering if anyone was familiar with those labels and had an idea of what they were used for.
    I was sort of thinking leaded body work. Low tin for filling and if the No 20 is 20% Sn then that might have been used to tin the body panel before filling. But that is all just a SWAG. Been around 25+ years since I did a small amount of lead body work and don't recall the solders used.

    Any ideas on if those numbers are tin percentages and/or what that solder was used for?
    I can mix 2 5/8 Sn at 50/50 with WW's for a nice pistol or mild rifle round. Or use as is for HBWC rounds. That is assuming that 2 5/8% was Sn rather than some other alloy. I recall 5% solder but not anything at 2 5/8 percent. That is really low for Sn and an odd amount too. Not 2% not 3% but 2 5/8% rather weird.
    Je suis Charlie
    Scrap.... because all the really pithy and emphatic four letter words were taken and we had to describe this way of getting casting material somehow.
    Feedback page http://castboolits.gunloads.com/show...light=RogerDat I do trade a bit from time to time.

  2. #2
    Boolit Master PBaholic's Avatar
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    Maybe the 2 5/8% is Silver Solder. 2 - 3% Silver is a common alloy for Silver solder.

    No idea on the No. 20.

    Can you do a hardness test before you melt it???

  3. #3
    Boolit Master
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    Pencil check, or for casual checks I use a spring loaded prick punch and compare the dimple to dimple made in known hardness lead.
    Can tell difference between plain, WW, and Linotype "in the field" with that prick punch.
    Pencils are probably good to a 3 points of BHN +/- 1 either way.

    How hard is silver solder?

    I won't melt it until I decide to use it for casting, silver solder is high tin solder as I recall, be sort of a waste to use it at 50/50 WW mix for plinking ammo. But I found this at 2.5% silver the rest lead, zero tin, zip, nada. http://www.jm-metaljoining.com/pdfs-products/A25.pdf And I also find some stuff listed as tin with 2.5% silver.
    Je suis Charlie
    Scrap.... because all the really pithy and emphatic four letter words were taken and we had to describe this way of getting casting material somehow.
    Feedback page http://castboolits.gunloads.com/show...light=RogerDat I do trade a bit from time to time.

  4. #4
    Boolit Master

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    It may also be a body solder from the days before bondo when holes and dings were "leaded" in

  5. #5
    Boolit Master PBaholic's Avatar
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    Quote Originally Posted by RogerDat View Post
    How hard is silver solder?
    Good question!

    I don't know. I have some that I got with some other lead, but it's in wire form, and I can't test it in the form. I've saving it for when I need to solder some obscure metals.

    I would assume harder, but I don't know by how much. You would think this would be somewhere on the Internet, but I did a little searching, and came up with nothing. I have some text books and they show Silver being a BHN of both 35 and 90, so I can't even guess.

  6. #6
    Boolit Master BNE's Avatar
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    Quote Originally Posted by RogerDat View Post

    How hard is silver solder?

    I won't melt it until I decide to use it for casting, silver solder is high tin solder as I recall, be sort of a waste to use it at 50/50 WW mix for plinking ammo. But I found this at 2.5% silver the rest lead, zero tin, zip, nada. http://www.jm-metaljoining.com/pdfs-products/A25.pdf And I also find some stuff listed as tin with 2.5% silver.
    I had a member here test some alloy I have with 2.5% Silver. It tested very similar to clip on wheel weight.

    2.5% Silver is close to the lead/ silver eutectic point. A eutectic alloy melts like water. There is no "slushy" phase. It is a solid at one temp and then when the temp is raised one degree, it turns to liquid. Silver readily alloys (Mixes with) Lead. It alloys better than Tin. It also toughens the lead more than it hardens the lead. I think it would make a great alloy for HP bullets, but that is only an opinion right now!
    I'm a Happy Clinger.

  7. #7
    Boolit Master
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    You can't have too much info:


    Melting Point of Eutectics of Lead with Other Metals:

    other metal per cent by weight temp. c.

    Silver Ag 2.3 304

    Arsenic As 2.8 292

    Gold Au 15 215

    Barium Ba 4.5 291

    Bismuth Bi 56.5 125

    Cadmium... Cd 17.4 248

    Magnesium, . Mg 3 250

    Palladium . . . Pd 5 265

    Platinum. . . . Pt 5 290

    Antimony . .Sb 12.5 251

    Tin.........Sn 62 183

    Zinc Zn .5 318

  8. #8
    Boolit Master

    garym1a2's Avatar
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    We used tons of silver solder on our rectifier line. Melts at 221C. Is very strong and good for high temp applications. We used 96.5SN/3.5 AG and 97/3

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check