Perforated Flask Casting Gasket

Jewelry Discussion
1

I am building a vacuum casting setup that uses perforated flasks
and I am trying to find out the composition of the casting
gasket. Is it a ceramic fiber material or a high temperature
silicone or what?

2

In a message dated 97-07-19 20:46:40 EDT, you write:

I am building a vacuum casting setup that uses perforated flasks
 and I am trying to find out the composition of the casting
 gasket. Is it a ceramic fiber material or a high temperature
 silicone or what?

Silicone. $6.00 from Gesswein. 800-243-4466

3

Hi Mike,

I am building a vacuum casting setup that uses perforated flasks
and I am trying to find out the composition of the casting
gasket. Is it a ceramic fiber material or a high temperature
silicone or what?

As fasr as I can tell the gasket is a silicon rubber. It’ll have
to be replaced sometime down the line, but what the heck, you
have to replace tires on the car too.

You might try the hardware store, The Ace Hrdw near me has
silicone rubber in 12" square sheets about 1/8" thick. I built
my vacumn caster & I used a corian plate with a silicon filled
groove.

Dave

4

Mike McKim wrote:

I am building a vacuum casting setup that uses perforated flasks
and I am trying to find out the composition of the casting
gasket. Is it a ceramic fiber material or a high temperature
silicone or what?

I built one many years ago (1970’s) and silicone rubber was used
at that time. I just bought it from Rio Grande, it wasn’t very
expensive.

Robin Casady
http://www.scruz.net/~rcasady/

Macintosh software for:
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LX200 telescope control

5

The gasket material I have used on my machine is really nothing
too amazing it doesn’t seem to like temps arround 1000+ but it
works just fine in the normal 850/900f range. I think it is just
a piece of high temp gasket material available at auto supply
stores. It is rubbery and burnt orange in color.

Hope this helps, Timothy

6

Indian Jewelers Supply in New Mexico sell a great high
temperature gasket for vacuum casting. I cast many of my flasks
at 1200 degrees Fahrenheit and have been using the same gasket
now for about 5 years. The gasket is thin and not flexible, but
it really takes the heat and seals well also.

Kenneth Gastineau
@Kenneth_Gastineau1

7

Can be both… prefer to fiber although it break if u look at
it…the solicon will only handle about 900F degrees

Jim