[TowerTalk] GRC vs. IMC

[K7LXC at aol.com]

>  Thanks, but my question  was not about tubing or masts.  My question was 
about GRC vs. IMC for  mounting pipes.
 
    Please elucidate what GRC and IMC are. I was unable  to google either 
of them and get the answer. 
 
Cheers,
Steve     K7LXC