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Thread: Red gold solder 750R1

  1. #1
    Join Date
    Feb 2019
    Posts
    12

    Default Red gold solder 750R1

    Hi there
    I bought red gold solder years ago, 18ct but not sure if its easy. Medium or Hard? I usually stamp on it at the time but not this time.
    All it has on it is 750R1!
    Any ideas, thank you

  2. #2
    Join Date
    Dec 2009
    Location
    Central London
    Posts
    7,986

    Default

    My table shows the melting range of solders.
    If you use a small snip of your unknown, side by side with say a piece of medium silver solder of the same size and melt them quite slowly on a piece of scrap, it will give you a clue to the hardness. Dennis.
    Attached Thumbnails Attached Thumbnails img013.jpg  

  3. #3
    Join Date
    Feb 2019
    Posts
    12

    Default

    Thanks Dennis

  4. #4
    Join Date
    Jul 2009
    Location
    cotswolds
    Posts
    3,272

    Default

    I don't know if it's any help, but I've only ever been able to find red 18ct in medium (in panels anyway - I don't think I've ever seen red in wire) - I have a little stash of most grades of solder, and it's the one gap that I've never been able to fill! Mine are simply marked 9 and 18 'red'

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