Psi

[bigdog173]

What psi do most people use for the bottle tops? I have a vacuum but not sure if its strong enough

 

[jamesl0822]

Depends on the type of media bottle....plastic is no good you really need a glass media bottle. The plastic will crack above 8 psi I believe. I regularly use my hand vac at 25psi with no issues. But this is my setup....Sigma-Aldrich® vacuum filtration assembly for 47 mm filters with glass support, #8 stopper, 1 L flask | Sigma-Aldrich

Electric vac pump or hand pump?

 

[Chairman of the board]

Wow plastic cracks at only 8 psi! That's good to know

 

[jamesl0822]

Actually I don't know from personal experience as I went straight to glass. But 8 is the lowest psi I have heard problems with and that's freaking low. Glass is cheap its a no brainer

 

[hijacked]

Wow plastic cracks at only 8 psi! That's good to know

It depends on how hot the solution is when you try to filter it. If its cool, the plastic will hold 25 inches of vac. Not psi. I have had them crack at 10, but its because i was trying to filter solution over 170 degrees F.

 

[jamesl0822]

Thanks for the clarification on that Hijacked....I have always used the glass media bottles bc of the issues with cracking and they are pretty cheap. Filtering over 150F is really not good bc it can melt the filter. That is the voice of experience unfortunately.