FIBC Static Types A, B, C & D Explained

Filling and emptying bulk bags generates static electricity. In the wrong environment, a static discharge can ignite combustible dust or flammable vapors. FIBCs are classified into four types based on how they manage that risk.

Type A

Standard woven polypropylene with no static protection. Suitable only for non-flammable products in environments with no flammable solvents or dust present.

Type B

Made from low-breakdown-voltage fabric that prevents dangerous propagating brush discharges. Type B bags can be used with combustible dusts, but not where flammable solvents or gases are present.

Type C

Conductive (groundable) bags woven with a grid of conductive threads. They must be electrically connected to ground during filling and discharge. Safe for combustible dusts and flammable atmospheres — as long as the ground connection is verified every time.

Type D

Antistatic / dissipative fabric that safely neutralizes static without a ground connection. Ideal where reliable grounding can't be guaranteed.

• No flammables, non-combustible product → Type A
• Combustible dust, no flammable vapors → Type B
• Flammable atmosphere, grounding available → Type C
• Flammable atmosphere, grounding unreliable → Type D