Recently our company collected 5 samples of N330 granules from 5 manufacturers in China. All N330 granule are produced by wet-granuling process which is more popular than dry-granuling in China now.  Our aim is to locate big granule of N330 as it may reduce the dust of carbon black in workshop. No need to say it will offer cleaner circumstance to factory and workers will prefer big granule N330.  Another advance of big granule N330 is that it may be dispered more easily and evenly when mixing with other material,like resin or additives.

Ok,Let's start. I'll show you the pic took by us and you may find that the size of N330 granules from different manufacturers varies too much.