These types of chains includes all that come as a part of non standard series, those have quite complex designs and are limited to few kinds of applications. Including Steel Plate tops, Rubber Plate tops, non standard chain pitches etc. Each type has differentiated characteristics and are usually order based and quite expensive than the standard ones.
MS (Mild Steel), SS (Stainless Steel), Teflon, Carbon Steel etc
ANSI, BIS
Depends On Application
All Industries.