FIBC BULK BAG MANUFACTURER · LUANNAN, TANGSHAN, HEBEI, CHINA

Type C vs Type D FIBC: Which Anti-Static Bag Do You Need?

Both control static, but they work in opposite ways — and picking wrong is a safety risk, not just a cost difference.

Ask our engineers about this specification →

PP woven fabric with conductive yarns used in anti-static FIBC — PP woven fabric with conductive yarns for Type C and Type D FIBC

Type CGrounded fabric

Type DNo earth required

≤10⁸ ΩResistance to earth

IEC 61340-4-4Test reference

The key difference: Type C must be grounded, Type D must not be. A Type C (conductive) FIBC is woven with conductive threads and only works when connected to earth, so static drains away safely. A Type D (anti-static) FIBC uses quasi-conductive threads that leak charge to air by low-energy corona discharge — no earth connection needed. Choose based on whether you can guarantee a reliable ground on every fill and discharge.

Side-by-side comparison

Factor	Type C (Conductive)	Type D (Anti-static)
How it works	Conductive threads → earth	Quasi-conductive threads → corona to air
Grounding required	Yes — mandatory	No
Best when	Reliable ground exists	Grounding uncertain / mobile
Typical cost	Lower per bag	Higher per bag
Main risk	Forgotten / broken ground	Contaminated surface reduces effect
Standard	IEC 61340-4-4	IEC 61340-4-4

When to choose Type C

You have a verified, controlled earthing point at fill and discharge.
Operators are trained and grounding is part of the procedure.
You want the lower-cost anti-static option for a fixed line.

Type C is common in stationary silo and bagging lines where grounding is built in. See our grounding guide for the correct method.

When to choose Type D

The bag moves between sites, trucks or non-conductive containers.
You cannot guarantee every operator grounds the bag.
You want to remove grounding hardware and training from the equation.

Type D removes the "forgot to ground it" failure mode — at the cost of a higher bag price and a clean-surface inspection before reuse.

Frequently asked

What is the main difference between Type C and Type D FIBC?+

Type C is conductive and MUST be connected to earth (grounded) to work safely. Type D is anti-static and dissipates charge by corona discharge WITHOUT grounding. That single difference drives where and how you can use each.

Which is safer?+

It depends on your site. Type D is safer where a reliable ground cannot be guaranteed (moving vehicles, non-conductive silos, human error). Type C is safer where you already have a verified, controlled grounding point and want lower cost.

Is Type D more expensive than Type C?+

Type D typically costs more per bag because of the special quasi-conductive threads, but it can save money by removing grounding hardware, training and the risk of a forgotten ground connection.

Can I use a Type C bag without grounding?+

No. A Type C bag is only safe when properly earthed. Using it ungrounded is dangerous in a flammable atmosphere and defeats its purpose.

Type C vs Type D FIBC: Which Anti-Static Bag Do You Need?

Side-by-side comparison

When to choose Type C

When to choose Type D

Frequently asked

Not sure C or D for your site?