Static Electricity in FIBCs | A Guide To FIBC Bulk Bag A, B, C, D Types

Published 18 Mar 2021

FIBC Bulk Bags A B C & D

FIBC Bulk Bags A B C & D

FIBC Bags

A B C & D FIBC Bulk Bags

Flexible Intermediate Bulk Containers FIBC’s also referred to as “bulk bag”, “big bag” or “tote” are used for the transportation of dry bulk goods such as sands, fertilisers, plastic granules seeds, resins and powder coatings have long been considered a great innovation in the transportation of dry flowable material since their introduction in the sixties.

In general using FIBCs are one of the more risky processes used on plants that you can encounter with regards to static electricity as there is a lot of dust present at any one time.

Thorne & Derrick, Experts in Equipment for Explosive Atmospheres are your local Technical Distributor for Newson Gale and their extensive range of static earthing and bonding clamps including the Earth-Rite FIBC – you can contact us today to discuss your site compliance with the latest safety standards or to arrange an informal site survey.


A Guide To FIBC Bag Types

When FIBCs are filled and discharged, the flowing of the finely powdered substances can cause a buildup of static electricity. Removing and or preventing an electrical charge is imperative in the packaging of flammable and combustible materials OR in an environment where combustible dust is present.

Properly mitigating the dangers associated with the buildup of static electricity can at times be the difference between life and death, especially when storing and transporting flammable and combustible materials.

National Bulk Bag will work with you to determine the right type of fabric to ensure safe handling of your product.

There are four specific types of bags, each with unique features and safe uses. Please take some time to read about the different types of FIBC fabric and how they should and should not be used.

Type A bulk bags

Type A FIBCs are made of plain-woven polypropylene and other non-conductive fabrics. Static electricity is generated as products move over or rub against the inside surface of the bulk bag when they are filled/emptied. There is no static protection provided by Type A FIBCs

Type A bulk bags can be used to safely transport non-flammable products. There should not be any flammable solvents or gases present around a Type A FIBC.

Type A FIBC Bulk Bag

Type A FIBC Bulk Bag

Safe use for type A bulk bags:

  • To transport non-flammable products.
  • No flammable solvents or gases present around the bag.

Do not use type A bulk bags for:

  • Transporting flammable products.
  • When flammable solvents or gases are present around the bag.
  • Should not be used where a flammable atmosphere with a minimum ignition energy ≤1,000mJ is present.

Type B bulk bags

Type B FIBCs are similar to Type A bulk bags in that they are made of plain-woven polypropylene fabrics or other non-conductive material. Also like Type A bulk bags, Type B bags do not have any mechanism for dissipating static electricity.

The difference between Type A & B FIBCs is Type B are made from materials that have a low breakdown voltage to prevent an incident where highly energetic, and dangerous propagating brush discharges occur.

Although Type B bulk bags can prevent propagating brush discharges, they are not considered anti-static bulk bags because they do not dispel an electrostatic charge.

Type B FIBC Bulk Bag

Type B FIBC Bulk Bag

Safe use for type B bulk bags:

  • To transport dry, flammable powders.
  • No flammable solvents or gases present around the bulk bag.
  • Intended to be used in environments with dust with ignition energies less than 3mJ.

Do not use type B bulk bags for:

  • When flammable solvents or gases are present around the bulk bag.

Type C bulk bags

Type C FIBCs, also known as conductive FIBCs or ground-able FIBCs, are made from non-conductive polypropylene fabrics interwoven with conducting threads traditionally sewn in a grid pattern.

These conducting threads must be electrically interconnected as well as connected to a designated ground/earth during filling and discharging. This connection to the ground/earth during filling and discharging is imperative to the safe use of Type C bulk bags.

Type C FIBC Bulk Bag

Type C FIBC Bulk Bag

Safe use for type C bulk bags:

  • To transport flammable powders.
  • When flammable vapors, gases, or combustible dusts are present.

Do not use type C bulk bags:

  • When ground connection is not present or has become damaged.
  • Resistance from any location FIBC to ground-able point.
Static Earthing For Type C FIBC Bags

Earth-Rite FIBC – Static Earthing For Type C FIBC Bags in potentially flammable/combustible gas or dust atmospheres

The static earthing system is able to compensate for normal wear and tear on Type C bags it is important to ensure the bag maintains its ability to dissipate electrostatic charges. It is vitally important to ensure the bag of the Earth-Rite FIBC system and the plant earth grounding point is functioning properly.

Type D bulk bags

Type D FIBCs 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 FIBC to a designated ground/earth.

Type D bulk bags such as Crohmiq™ bulk bags are manufactured with fabric containing quasi-conductive yarns that safely dissipate static electricity into the atmosphere via safe, low-energy corona discharge.

Type D FIBCs can be used to safely package combustible products and handle products in combustible and flammable environments.

Type D FIBC Bulk Bag

Type D FIBC Bulk Bag

Safe use for type D bulk bags:

  • To transport flammable powders.
  • When flammable vapors, gases, or combustible dusts are present.

Do not use type D bulk bags:

  • When surface of FIBC is contaminated or coated with conductive material such as grease or other flammable and or combustible materials.

What type of bag is right for my application?

As you can see, although type B bags have some anti-static properties, the only bags that are truly safe to use to store and transport flammable and combustible materials OR use when flammable vapors, gases or combustible dusts are present are type C & D bags.

Type C bags are safe to use in these scenarios when properly connected to a designated grounding point. Type D bags eliminate the possibility for human error associated with properly grounding the bag. Type D bags are manufactured with fabric that contains special yarns that dissipate static electricity.


About National Bulk Bag

National Bulk Bag

At National Bulk Bag, we stock one of the largest FIBC bulk bag inventories in the U.S. With 75+ different types of in-stock bags, ready for same-day shipment, our team of experts are ready to help with all of your FIBC needs.

Our experts know that every customer and application is unique and will work with you to determine whether one of our 75+ in-stock bulk bags or a custom manufactured bag is best for your specific needs.

Our FIBC specialists have over 20 years of industry experience and offer the highest level of customer service in the industry. Their focus is on making your buying experience easy, informative, and enjoyable.

Above all, our goal is to supply you with a high-quality FIBC that meets your needs and is the best possible value for your investment. We strive to build long lasting relationships with all of our customers through the lifetime of their FIBC bulk bag needs.


Newson Gale Static Earthing Clamps, Cables & Products

Hazardous Areas & Explosive Atmospheres

Electrical equipment, including static earthing systems and electrical apparatus, for use in hazardous locations must be correctly specified and suited for the flammable gas/dust group, the temperature classification and that particular explosion protection concept.

Contact Thorne & Derrick for expert and professional guidance on the selection of the most suitable static earthing products for your application from the Newson Gale range.

Newson Gale Static Earthing Clamps – Earth Rite, Bond Rite & Cent Stat

Newson Gale Static Earthing Clamps  Earth Rite | Bond RiteCen-Stat


Experts in Electrical Equipment for Explosive Atmospheres & Hazardous Areas