I recently obtained a vacuum chamber and pump to get the air out of my silicone rubber. When I vacuum the material (after mixing Parts A + B), my silicone takes forever to de-air and I still end up with some bubbles in my silicone rubber. Is this normal? It sounds like your vacuum pump is not pulling enough of a vacuum to quickly and efficiently get the air out of your silicone mix.
After your mixing container is placed in the vacuum chamber and the vacuum pump is turned on, the rubber should rise, break and fall in less than 5 minutes.
The minimum level of vacuum to be pulled is 29 inches of mercury (also measured as “-1 Bar”).
