Actually, it's more like 0 psi  or 0 bar or whatever unit you prefer.
You could get a better effect for forming your workpiece by using compressed 
air pushing instead of sucking on the other side.
That would be blowmolding instead of vacuumforming

>> Vacuum is limited to about 14.7psi. Jovian piclisters can get 
>> considerably
>> higher vacuums, of course.


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