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Posted by Will (in IL) [98.215.26.138] on Wednesday, January 13, 2010 at 22:47:32 :
In Reply to: firewall cardboard posted by rich nj [69.115.252.7] on Tuesday, January 12, 2010 at 22:33:14 :
In the OEM side of the business we were switching materials to take weight out, but generally you have a heavy barrier to stop low frequencies, and a batting (fluffy layer) to absorb the higher side. Rubber was the best heavy material.