Silver solder.

Silver solder.

This topic has 1 reply, 2 voices, and was last updated 8 October 2026 at 16:16 by JasonB.

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8 October 2026 at 15:36 #868442
Michael Callaghan
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@michaelcallaghan68621
Hi, I need to make some repairs to a copper boiler. Given the price of solder from U.K. suppliers I had a look at other sites. However they are giving prices for 5 percent to 30 percent. I take it the lower value is low temp solder.

what do I need. Thanks
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8 October 2026 at 16:16 #868445
JasonB
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@jasonb
No, a 30% solder will have a higher melting point than 55%

The 5% probably has about 1/3rd zinc in it so not what you want for a boiler, again higher melting point than 55%
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