[TowerTalk] solder

[Harold R. Hepner]

The solder should be ok, it's a non corrosive flux. it's a 50-50 tin 
lead mixture so it needs to cool before it is moved. the eutectic 
63-37 does not have the plastic state that causes cold solder joints 
like the other blends. The water soluble "organic" fluxes are 
suitable for electronics work, however they must be removed or washed 
off within about 4 hours because they are corrosive. The lead free or 
RoHS (restrictions on hazardous substances)  solders are basically 
tin with about 3% silver, it has a higher melting point  and the same 
fluxes are used. Reworking lead free assemblies is a little more 
challenging and mixing lead free and leaded solder does not help. 
There have been roamers that the lead free joints will fracture 
easier that leaded joints with mechanical stress like vibration. Time 
will tell.

Harold AD7QJ


At 10:42 AM 1/11/2010, you wrote:
>"Hello to all on TT. I have a roll of old solder. the label states made in
>england. Alloy Sn 50 ersin muliticore 5 core solder. non-corrosive flux. Can
>this be used for soldering connectors without that nasty degrigation. Im
>just not sure if it contains lead which is bad. Any help?
>
>tony k2vi"
>
>
>Most electronic grade solder is 60 Sn - 40 Pb with a rosin core. I use a
>water soluble flux Kester 63-37 that I buy from Jenson for all connectors I
>make.
>
>You have to watch for using plumbing solder with an acid core for electrical
>applications. That can have nasty consequences.
>
>73 Craig
>
>
>Craig Clark K1QX
>Radioware
>PO Box 209
>Rindge NH 03461
>603 899 6957
>
>
>
>
>
>
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