Joebobber
Member
What are you guys using for pressure pot pressure? Do you change it between resin types/brands ie silmar 41 and alumilite clear?
Clear casting pressure question
- Thread starter Joebobber
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pssherman
Member
I use about 60 psi for silmar 41 and alumilite clear slow. The pot is rated for 80 psi.
its_virgil
Member
my pot is "rated" at 60psi and I cast at 45-50psi. (silmar 41, alumilite clear and clear slow and epoxy resin)
jttheclockman
Member
Why change? air bubble is air bubbles and you want to get rid of them I am a 60 guy. I use Silmar and Liquid Diamonds.
woodwzrd
Member
I cast Silmar 41, Alumilite, and JB Royal epoxy and use 60-65 for everything.
Kenny Durrant
Member
I use Alumilite Clear Slow, Polyester and Epoxy Resins. My pots are rated for 80 psi and I use 55-60 psi. The only thing that changes is the pot time. Why change anything else. I've read that some use 35 psi that it was all that was needed. I figured if I could use extra pressure why not.
JohnU
Member
I watched a demo once where the guy said to never cast below 80. I cast with mold holding 30 grams to 600 grams and never needed more than 55 lbs of pressure. Some of my pots are rated to 80 but I don't need it.
I usually stay between 50-55. As long as you get your resin under pressure before it thickens you won't have a problem.
I usually stay between 50-55. As long as you get your resin under pressure before it thickens you won't have a problem.
Curly
Member
We had our pot set up for 10psi up to 15psi to keep bubbles from forming on tube in casts (Chiyogami paper for example) with polyester resin. One part of the reason was not needing more and the other was some kind of molds will leak around the plugs under higher pressures, filling the tubes.
thewishman
Member
45 for Silmar 41 - used to do 60, no need to go that high.
Joebobber
Member
I ask because while perusing the internet the other night because I couldn't sleep because our furnace went out, I read somewhere that this 1 guy does 90psi for silmar and 45 for alumilite. I was a bit blown away by 90 psi, as I thought most people stayed right around 45-55. Just wondering if it was important to fine tune each resin you use. Isn't 90 a bit high? I mean that's alot of pressure.
jttheclockman
Member
No need for it at all. I am guessing he has a real good pressure pot because he exceeded the rating of most pots which are 80 lbs.
Joebobber
Member
That is also quite a big difference in pressures, going from 90 to 45. I guess i never thought about that before.