Type D FIBC
Type D FIBC are made from a special type of fabric that contains antistatic threads.
What is a Type D FIBC Bag?
A Type D FIBC (Flexible Intermediate Bulk Container) bag—commonly known as a static dissipative bulk bag—is an advanced industrial packaging container engineered to safely store and transport combustible dry materials in volatile ATEX environments. Unlike standard bulk bags, Type D containers are manufactured using specialized fabric interwoven with quasiconductor or static-dissipative yarns.
The primary innovation of a Type D big bag is its ability to dissipate electrostatic charges safely into the surrounding atmosphere without requiring a grounding connection. This makes it an essential safety solution for handling fine powders, flammable resins, and combustible dusts where traditional grounding protocols are impractical or prone to human error.
Technical Specifications of Type D Big Bags
How Type D Static Dissipative Fabric Works?
Type D fabric neutralizes static electricity through a physical phenomenon known as Corona Discharge.
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Charge Accumulation: As dry materials frictionally rub against the super sack wall during rapid filling or discharging (triboelectric charging), electrostatic energy accumulates.
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Ionization Grid: The interwoven grid of specialized dissipative threads focuses the localized electrical field strength.
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Low-Energy Dissipation: This high electrical field ionizes nearby air molecules, converting the static charge into a harmless, low-energy corona discharge that dissipates safely into the surrounding air.
Because the energy released during a corona discharge is significantly below the Minimum Ignition Energy (MIE) of most flammable gas vapors and dust clouds, it eliminates the formation of high-energy incendiary sparks or brush discharges.
Key Differences: Type D FIBC vs. Type A, B, and C Bulk Bags
| Feature / Property | Type A Bulk Bags | Type B Bulk Bags | Type C Conductive Bags | Type D Dissipative Bags |
| Static Protection | None | Low Breakdown Voltage | Continuous Conductive Grid | Static Dissipative Grid |
| Grounding Requirement | Not Applicable | Not Applicable | Mandatory (R < 10^8Omega) | NEVER Required |
| Safety Mechanism | None | Prevents Propagating Brush Discharge | Drains charge directly to earth via ground clamps | Safely releases charges into air via Corona Discharge |
| Human Error Risk | High (if used in hazardous zones) | High (cannot dissipate static charges) | High (catastrophic spark if operator forgets to ground) | Zero (ground-free operation eliminates operator error) |
| ATEX Zone Suitability | Non-Hazardous | Non-Flammable Solvents Only | Zone 1, 2, 21, 22 (With Grounding) | Zone 1, 2, 21, 22 (Ground-Free) |
| Best Application | Non-flammable dry goods (food grains, sand) | Dry powders with no flammable vapors nearby | Hazardous chemicals with active earthing stations | Volatile chemicals, fine powders, and ground-restricted plants |
Key Advantages of Type D FIBC Bags for Global Supply Chains
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Eliminates Human Error: Removes the severe safety hazard of ungrounded operation caused by operator oversight, rusty earthing clamps, or broken ground wires.
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Streamlined Operations: Faster loading and unloading cycles because plant workers do not spend time attaching, monitoring, or detaching earthing clamps.
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Reduced Infrastructure Costs: No need to install, test, or maintain complex grounding monitoring systems across warehouses and shipping docks.
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Global Safety Compliance: Fully complies with international explosion-prevention codes required by European, American, and Asian chemical logistics regulators.
Important Safety Guidelines & Compatible Liner Selection
While Type D bulk bags offer superior ground-free protection, key operational guidelines must be maintained:
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Surface Contamination: Keep the outer bag surface free from heavy non-conductive coatings, thick dirt, oil, or paint, which can insulate the dissipative threads and block corona discharge.
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Atmospheric Humidity: Type D fabrics are engineered to function across wide humidity ranges, but extreme surface contamination should be avoided.
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Liner Selection: Standard polyethylene (PE) film liners act as an insulator and block static dissipation. If a moisture barrier is required, you must use an approved Type D compatible anti-static liner (Type L2 liner) certified to work in conjunction with the outer Type D bag fabric.
Frequently Asked Questions
Do Type D FIBC bags ever need to be grounded?
No. Type D bags are specifically designed to safely dissipate static charges into the air via corona discharge without any earthing attachment.
Can a Type D bag be used in atmospheres with flammable gases or vapors?
Yes, certified Type D bags meeting IEC 61340-4-4 standards are safe for use in ATEX Zone 1 and Zone 2 environments containing flammable vapors, provided the ignition energy requirements are met.
What happens if a Type D bag gets dirty or painted over?
Contaminants like heavy paint, oil, or thick non-dissipative coatings can insulate the specialized yarns and impair the corona discharge process. Bags should be kept clean and dry for optimal safety performance.
How does humidity affect a Type D big bag?
Unlike standard anti-static coatings that rely on ambient moisture to function, certified Type D fabrics meeting IEC 61340-4-4 are engineered to operate effectively across low and high humidity levels. The corona discharge mechanism ionizes surrounding air molecules independently of relative humidity, ensuring reliable protection even in arid desert or cold-storage environments.
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10pcs/ bale, 100 pcs/ package
