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Message: <blockquote data-quote="defcon1" data-source="post: 1727391" data-attributes="member: 30064">Discovery!!I've discovered two of the secrets of Dynamat and Raammat.a) They are simply modified Bitumen compound i.e. Bitumen with a dispersal of a polimer like polypropelene or styrene butadiene styrene etc. The polimers do not chemically bind with the bitumen but their presense in the mix changes the physical properties of the material. The average softening point of these materials are about 80 degrees C. The same material is used in roofing, waterproofing and as floor underlays.b) Heat resistance. Part of Dynamat and Raammat's heat resistance is due to the type of polymer mixed in. But, I believe, in majority, the heat resistance is a factor of the aluminium layer applied. Remember...aluminium loses heat faster than most other materials and that is why heat-sinks are made from it, and also why aluminium engines cool down so fast. Also, it is highly reflective, so it will reflect away heat and prevent heat buildup.So...presenting Defcon's sonic neutralizing sound dampening material...a) One layer of normal bitumen sheet (roofing grade) or flashing strip.b) One layer of normal al foil that can be bought from any hardware store.I found some 4" flashing strip in the local hardware shop. Didn't pay attention to the price, but I think I'll do some experimenting this weekend.Wish me luck!</blockquote>

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