Type A bulk bags are basic, all-purpose bags that are made of plain-woven polypropylene. These FIBC bags do not offer static protection and are only used to safely transfer non-flammable products. Flammable solvents or gases should not be present in or around Type A bags.
These bags are also made of non-conductive materials and should be used in the presence of combustible dusts with MIE of greater than 3mj — but not around flammable vapors. Type B FIBC bags are used to store and safely transport dry, flammable powders.
Type C bulk bags are known as conductive FIBC bags and have conductive threads woven throughout the bag and are connected to tabs which must be grounded during filling and/or discharge. The threads dissipate static energy safely from the surface of the bag. Type C bags safely store and transport flammable powders or when flammable gas, dust, or vapors are present.
Type D bags are static-dissipating bags similar in use to Type C, but these bags do not require grounding. Instead the antistatic fabric itself has special additives to avoid brush discharges and incendiary sparks. Type D FIBC bags can safely store and transport flammable powders or when flammable dust or gases are present.