Using Pascal's Hydraulic Formula 30psi will yield 5.1 tons of force, 35psi = 6 tons, 40psi = 6.8 tons, and 45psi = 7.6 tons. I have been pressing now for over 8 hours at 30 psi without the slightest sign of stress.
I upgraded my rosin press with a air/hydraulic jack. Working the pump handle in a long pressing session hurt my back. It is a low profile 20 ton jack. I run it at 30 PSI which is about 5.1 tons of pressure. according to the math 35 psi is 6.1 tons and 40 psi would be 6.8 tons.
When I first started handling it I lost as much as I got:eek:. It is a skill. I use terpenes exclusively to thin. here is the ratio that works best for me 1g QWET .2g strain specific terpenes, .2g Viscosity. Sometimes I need to make the cartridge water tight with a single layer of plastic wrap...
How much and what type of material did you run? I have had variable results from different strains. It takes more bud than you think. I had 8 QT jars full of high quality LARF to get 15g. of extract.