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Adam Savage (of mythbusters) made a tutorial on how to make a large silicone mold but using cheap plaster instead of rather expensive silicone for the bulk of the mold.
crowe wrote:Never worked with silicone before, so what's the purpose for putting the silicone into a vacuum chamber? Are you removing air from the mixture.
you noticed how it pretty much sucked all the air out of the silicone mixture. i guess you could replace this step by letting it rest or putting it on a vibrating plate but i assume this is much faster
crowe wrote:Never worked with silicone before, so what's the purpose for putting the silicone into a vacuum chamber? Are you removing air from the mixture.
you noticed how it pretty much sucked all the air out of the silicone mixture. i guess you could replace this step by letting it rest or putting it on a vibrating plate but i assume this is much faster
good vid!
The process is known as "vacuum degassing." Essentially, by vacuuming the silicone, you can quickly pop all of the bubbles that exist in the rubber from mixing/shipping etc... There are several other methods for removing the bubbles, and as stated, a vibrating table is very popular. One other method which almost always fails to get mentioned is the cheapest (and messiest) which is called "Bomb's Away" where you pour your silicone from high above the mold though a small opening. The thinner the stream, the fewer the bubbles. Good luck with these!
Sweet tutorial man! Gonna make a mold for terrian pieces I'm gonna work on!
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"Dahl makes weapons for professional mercs. They're heavy, accurate and effective, assuming you are strong enough to hold one!" - Marcus Kincaid 
