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Thread: Melting monotype letters and making ingots.

  1. #21
    Boolit Buddy
    Join Date
    Jun 2013
    Look up the differences between foundry type and monotype. Many times foundry gets sold as mono and the seller and the buyer are happy. Foundry are solid blocks with a half round groove. Monotype is generally hollow blocks and square grooves. Foundry is richer than mono and usually has 1-2% copper which is why it melts so funny. It sounds like you have some foundry type to me, which is good news because it goes even further as a sweetener. Probably 12-14% tin, 24-27% antimony and 1-2% copper.

    I have found that foundry needs about 45 minutes after it melts to fully mix. I like to wait till the foamy stuff mixes in and flux with wax a few times while I'm waiting. After it is mixed well I will use some wood chips so I know I'm not losing the good stuff when I pull the junk out.
    Last edited by mnewcomb59; 01-24-2023 at 10:00 PM.

  2. #22
    Boolit Master
    Join Date
    Apr 2020
    Communist New Jersey
    Here is some info I found while looking for identifying marks on monotype and Foundry type.
    Note this paragraph in the second link about foundry type with copper in it. Especially the melt temperature. I am going to do a bit more research and see if that is a typo and should read 980 degrees. This was published in 1983 so I would think it would have been corrected by now if incorrect.

    "Foundry type is made from an alloy, usually composed of approximately 60.5% lead, 25% antimony, 12% tin and 2.5% copper. The later ingredient is added to increase the durability of the type. Foundry type, with copper, melts at 1980º Fahrenheit."



    Look at the foot. Foundry almost always has a distinct groove across the foot parallel to the nick, whereas almost all Monotype-cast type has either no foot groove or a very slight one near one edge also parallel to the nick. Monotype metal could not be as hard as foundry but it usually does have some more tin and antimony than Linotype, especially Monotype intended for hand setting. For bullets you’re probably better off with Linotype slugs.
    Last edited by Rickf1985; 01-27-2023 at 09:42 AM.

  3. #23
    Boolit Bub
    Join Date
    Dec 2014
    Quote Originally Posted by rustyshooter View Post
    Sorry….what is CLS?
    I'm going to hazard a guess at 'chilled lead shot'. Just based on it being referred to in a prior post.

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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