rockwool vs oc 703

[NinthHour]

hey this may seem a little naive or something but when you talk about rockwool as an absorber how does this material stack up to oc 703? also (here comes stupid question of the decade) when i search for rockwool on ebay i get a ton of products that are for use in gardening however the stuff is compressed fibers like fiberglass so am i to understand that that is the same rockwool? and if i use it im not gonna end up with weeds growing into my iso booth am i?? thanks for your help on this one fellas

[kno1ills@yahoo.]

Search Roxul rockboard 60 or 80. Here's how they compare:

http://www.bobgolds.com/AbsorptionCoefficients.htm