Type A - Bags are made from plain woven polypropylene and other non-conductive fabrics. As there is no static protection provided by Type A FIBCs, it is essential that they are not used to store or transport combustible materials or used in flammable or combustible environments.
Type B - Bags are made from plain woven polypropylene fabrics that have a low breakdown voltage to prevent the occurrence of highly energetic propagating brush discharges that can ignite a dust-air mixture. Type B FIBCs cannot be considered antistatic because they do not have any mechanism for dissipating static electricity.
Type C - Bags are made from non-conductive polypropylene fabrics interwoven with conducting threads, normally sewn in a grid pattern, that connect the bag to ground via a grounding point. The connection to ground or earth during filling and discharging is critical to the safe use of Type C FIBCs. As with any manual operation, ensuring interconnection and grounding of Type C FIBCs is subject to human error.
Type D - Bags are made from antistatic and static dissipative fabrics designed to safely prevent the occurrence of incendiary sparks, brush discharges and propagating brush discharges without the need for a connection from the bulk bag to the ground. Type D FIBCs can be used to safely package combustible products and to handle products in combustible and flammable environments.