Originally Posted by ontherock
0.2 is for nation ships, 0.3 for neut ships, 0.4 for waste displacement.
Protection from splash damage (torps/mines) starts at 0.2 belt at about 50% damage reduction. From there it gradually increases to about 70% reduction at 1.5 belt. Like stacking tons of engineers, it's a diminishing gain, so most people stop at 0.2 belt.