Hi Annette and others… First, I would like to mention that there
are now many types of De ox silvers and anti-firescale silvers on the
market. Many of these have different alloys and different
properties… what works well with one type of alloy, may not be
correct for the next one… so, the best thing to do is to speak with
your alloy manufacturer and get all the pertinent info on the
material you use. Personally, I buy all my alloy’s from United
Precious metals as they are the original inventors of the material
and hold the patent rights . They also know a lot more about the
properties of the material than anyone else and are very helpful
when you have a casting problem related to the alloys they make.
There are a lot of knockoff alloys that are copies of their’s that
have had certain properties left out to attempt to by-pass their
patent… as a result, some of the copies do not have the
reusability of Uniteds metal.
The general rule of thumb when quenching Deox metals is to wait 20
minutes for a standard flask that is approx 4" dia by 6 or 7 " tall.
If your flasks are smaller, then it is possible to quench sooner…
for example , a 3" by 4" flask will be ready in about 10 minutes as
these flasks cool down quickly by themselves. Now, some items like
pendants and earrings will not show anykind of problem that you will
notice if you quench quicker… However, if you are doing rings with
deox and you quench too soon, the metal will be “hardened” and will
be easy to crack when attempting to size the ring through
conventional stretching methods. In some cases, if quenched to soon,
the shanks will crack or the ring may be brittle…This is not
apparent with items that are not rings.
We cast about 30 flasks a day in deox sterling and have never had a
problem with cracking or brittle metal. If the flasks are cast way
too hot, brittle castings can also occur and other problems will be
apparent. Daniel Grandi
We do casting, finishing and a lot of other processes for designers
and people in the trade.