Hi,

For small pots of silicone there may not be much air to come out so it may not be as dramatic.  Also the top surface area in a typical pot would be proportionately bigger for a small quantity.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

Hi,

Hi Ray,

Brian is right, at -0.8bar you won't quite reach the point where the entraped air does an 'exponential expansion' the closer you get to absolute vacuum the better. -0.8bar will still help to degass... you would just have to wait much longer for the air to rise and burst in a slightly more 'natural' way. If you have any questions on how to get the most out of your equipment/setup just let me know.

Paul Statham
Easy Composites / Carbon Mods - Technical

Thank you Brian

Sorry, I don't think -0.8 bar is enough. It should be a lot closer to -1 bar.

Brian.

I have today mixed and poured my first mould. Whilst degassing small (100 gram) mixes the rubber certainly bubbled up but I did not notice any significant 'collapse' as shown on your tutorial video, even after approximately 5 minutes.

The degassing chamber negative pressure was in excess of 0.8 bar. I left the pump running and chamber outlet valve open during this period.

Any reason I did not notice a collapse and is that negative pressure ok?

Regards

Ray