After a quick internet search, and reading an explanation from a post on a forum, my understanding is that different graphites have different ratings based on the density of the material. The denser the graphite, the high IM rating. The denser fibers cause the material to be stronger and more responsive, which in turn leads to increased sensitivity. These rods made from higher rated graphite are lighter because less overall material is needed to make a rod that will meet given specifications since said material is stronger than a lower quality material. Think X amount of IM 6 graphtie to make a M power rod. Only a percentage of X is needed to make the same rod with a higher quality graphite. Less material, less weight, lighter rod. It also stated on this post I read that rods made from higher quality materials tend to be a lot more fragile though, and susceptable to cracking alot easier than say an IM6 rod.
Again, this is just my understanding of what I read. Not sure if it's 100% correct. If someone more knowledgable could elaborate I'm appreciate it.
Posted Tue Oct 16, 2012 8:12 am