Vacuum vs pressure

[William Menard]

Can you use alumilite in a vacuum chamber instead of a pressure pot to cast blanks

 

[Cmiles1985]

I'll show you why not to use vacuum as soon as I find the picture...

 

[Jim Burr]

http://www.penturners.org/forum/f43/vacuum-vs-pressure-when-use-116777/
http://www.penturners.org/forum/f43/do-i-need-vacuum-pressure-114701/

And a dozen more...

 

[Cmiles1985]

I can't find the picture in my photobucket account, but basically, the vacuum makes REALLY big bubbles towards the surface of the cast due to the viscosity of the resin at the time you place it in the chamber.