Hi All,

I've been infusing for a few years now and recently I've purchased a Greisinger GDH absolute gauge. My question is, when everyone says they get a perfect leak proof bag - is it really? Is there an acceptable tolerance for a leak to still be considered perfect?

Obviously the volume/size of the part being infused is relevant so after multiple tests envelope bagging a 1m2 glass mould with about 1mm thick laminate + flow media. I've had leaks ranging from 1mbar/hour to 10mbar/hour.

I've been under the impression that a perfect seal means it should keep the same vacuum for days on end. Is this asking too much?

The parts I'm infusing are cosmetic carbon so avoiding any pin holes or bubbles is the goal.

Thank you.

Good post Chris, lots of good info. All though for the record, I do this for a living and I ALWAYS clamp the vac pump and shut it off after the infusion has completed 🤠