by Mike - Alumilite » Mon Apr 02, 2012 10:24 am
That is the Plat 55. The downside of the Plat 55 is that it is highly recommended you degas (vacuum) the rubber to remove the air as it is really thick. The alternative to that rubber in a silicone that does not require degassing is the Quick Set. This would be a much stiffer rubber that is great for 2 piece molds that does not need to be vacuumed.
Mike