Hi!

We have decide in our company to start making a silicone vacuum bags. There is several reasons why we have end up to make these compared to the basic single use bags. One of the most important reason is that we have complex moulds shapes and we start to make bigger quantities of our products. So having a silicone bags is a real time saver, compared to basic single use vacuum bag that needs a lot of careful placement. Also savings in the material is another good reason for using silicone vacuum bags. After 6 parts, its cheaper to use silicone bags, and cost saving can be around 80%. 

Last night I bought EZ-Spray junior spraygun and  EZ-Spray silicone 20.This is a sprayable silicone which cures quickly to soft rubbers with high elongation and tear strength. Cures in about 20 minutes. Newly fabricated vacuum bags can be removed from the tool assembly in a matter of minutes and be put into production service immediately. 

So have anyone else here made a Silicone vacuum bags?
There is two different ways to seal the bag to the moulds to make air tight seal. One option is to make a sealing channel to the mould, that the silicone goes inside the channel, and this way forms an airtight seal. Another option is to make a vacuum channel, that sucks the silicone bag tightly to mould flange and keeps the vacuum without any leakings. I am still thinking which method to choose.