As a consumer, I've been told that a certain jeweler has been
continually using a 30 year old mold to cast gold jewelry.
I thought those molds wore out after so many pours, being made from
rubber. So you can only shoot hot liquid wax in there so many times,
then you have to make a new mold.
Is this so?
A money making master mold might be made in carbide or SS or other tough
material. Making a temp mold from it would not use up the master.
There are often master molds to master molds to continue a long line if
poorer material is used. So if the sub-master can last for 4 years then
adding a level higher might be 40 years or 16 or ...
It could hinge on the material of choice from which the mold was made. I
made some silicone rubber end caps for some heat cables for roof drains
years ago. The rubber came from a friend that casts jewelry, which he uses
to make his molds. The end caps are exposed to sunlight and have held up
for years with no signs of hardening or cracking. In my opinion, yes, it's
possible for the molds to last that long. Depends on the frequency of use
and the care they receive in being handled. The temperature of the wax
isn't nearly as high as the vulcanizing temperature, so that may not play
much of a role in how long it lasts.
It looks like rubber to me but you're not buying it as a mold. It's a
collectors item for one and he seems to be talking about the rights to
produce Elvis glasses of the same pattern to sell.
> > Have you considered that it might not be a rubber master? A split ceramic
> > or plaster master should last a really long time if it only saw hot wax. >
> It is a jeweler out in LasVegas that is trying to sell his molds for $2.25 million
I understand about the "rights" but I was wondering if the mold still
be usable after 30 years.
Is it my understanding in a case like this, that the 'original' mold
is used again, and again for a wax piece. Then the wax piece is used
to make a mold to cast the finished gold piece in? This way the
'original' mold can be used virually forever?
TRafferty wrote in message ...
That is pretty much the process.
However, forever is a pretty strong term.
The molds are made from vulcanized latex rubber, and are subject to some
UV breaks them down, they can tear or get gooey, they can get stiff and
break the wax before releasing it.
I have some that I must have got the time and temp just right on the
vulcanizer and they are still in excellent shape 25 years later. Some are as
stiff as a shoeheel.
The patterns for "EP's" glasses are pretty much flat and condition of the
mold is much less critical.
Paul K. Dickman