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<p>[QUOTE=&quot;medoraman, post: 1076395, member: 26302&quot;]Yes the flux is acid, but plumbing solder at Home Depot can be bought all day long for about $7-8, so I seriously doubt there is, or has been for 20 years, any silver in it. I have replumbed both my houses, rentals, and friends about 20 times so I have bought a lot of it over the years. Yes, you are correct new houses have PEX usually, so the issue is mostly moot.</p><p><br /></p><p>I was an electrician and installer of central airs in college so I know about those solders as well. Electrical solder used to have about 30% silver but it was phased out in about 1988, and most soldering in residential homes phased out about the same time. Its cheaper and easier to use wire nuts than to solder. Silver solder like I said is still used for high temperature soldering of the outside copper piping of central airs, but you only use about 2 inches of the stick if you are any good for the whole unit, so I would say about $5 worth at todays markets, about a dollars worth back then. Still, a pack of ten silver solder sticks even then ran $60 or more, so you kept track of every one of them. The soldering was with acetelyne, since a common propane torch cannot get it hot enough. If someone was in the business of scrapping central airs, they need to pay attention to those copper joints if they get a lot of them.[/QUOTE]</p><p><br /></p>

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