Question for the experts

[neon007]

When using a pressure pot, is there such a thing as to much pressure? I plan a few castings I need to pressurize. All my previous castings have never been. I see some use 60lbs. Can 120psi be used? Thanks.

 

[skiprat]

I'm certainly no expert, but if I'm not mistaken then the standard pressure pot comes fitted with a pressure relief valve. The normal pots are rated at about 80psi max and the pressure relief valve releases pressure around 70-75psi.
Please don't use a pot without the relief valve. It could seriously injure you or worse[]

 

[OKLAHOMAN]

Steven is right and you only need to pressur to 30-40psi for most of our applications. I will go as high as 60psi on my cactus because so much air is trapped in the skeleton.

 

[gketell]

My PPot (be good) has a warning stamped into the steel on the lid: Do NOT exceed 80 psi.

I had to remove the pressure relief valve on my HF pot because it started leaking at about 35 pounds. But I set my air compressor's regulator to 70 psi and the pressure regulator on the PPot to 60 psi so I have a double safety installed.

GK

 

[toolcrazy]

My very first casting, last weekend. I set my Pressure pot to 40psi and I seem to have no bubbles at all. I've read here, you can go as low as 20psi with good results. I set mine to 40 becuase my tank looses about 5psi in 12 hours.

 

[neon007]

As far as my pressure pot, it is homemade, not harbor freight. It will hold alot more pressure. I just want to know if the added pressure will affect the resin in any way? Thanks.

 

[its_virgil]

No, but if 20-30 psi gets rid of bubbles, why go higher? I've cast as high as 65 psi and can't tell any difference in the casts I now do at 25psi.
Do a good turn daily!
Don

Originally posted by neon007
<br />As far as my pressure pot, it is homemade, not harbor freight. It will hold alot more pressure. I just want to know if the added pressure will affect the resin in any way? Thanks.