Type B Bulk Bags
Type B bulk bags, also known as antistatic FIBC bags, are essential tools for efficient and safe transportation and storage of bulk materials.
When handling materials prone to creating airborne dust clouds—such as wheat flour, starches, fine chemicals, or pulverized minerals—using standard packaging creates a severe risk of static sparks and dust explosions.
Type B bulk bags provide an essential safety layer for global supply chains. By eliminating the need for complex grounding systems required by Type C bags, Type B containers deliver a cost-effective, foolproof anti-static packaging solution for non-solvent, dust-sensitive operational environments.
What Are Type B Bulk Bags?
A Type B bulk bag is a specialized Flexible Intermediate Bulk Container (FIBC) designed to provide basic electrostatic protection during the handling of dry bulk materials. Constructed from plain woven polypropylene (PP) fabric with a controlled coating layer, Type B big bags do not contain conductive threads or grounding mechanisms.
Instead, Type B FIBCs protect against electrostatic hazards by enforcing a strict physical property: the breakdown voltage across the fabric and coating layer must not exceed 6 kV (< 6 kV), as specified by the international standard IEC 61340-4-4. Controlling breakdown voltage below this threshold prevents high-energy Propagating Brush Discharges (PBD)—a dangerous form of static spark that can ignite airborne dust clouds.
Technical Specifications Sheet for Commercial Type B FIBCs
Type B bulk bags are engineered to meet precise electrical, mechanical, and hygiene standards across various industrial and food-grade operations.
| Technical Parameter | Standard Type B FIBC Specification |
| Electrostatic Standard | Breakdown Voltage < 6kV (IEC 61340-4-4 compliant) |
| Grounding Requirement | NONE (No ground wires or grounding connections required) |
| Primary Material | 100% Virgin Woven Polypropylene (PP) |
| Fabric Coating / Lamination | 170-220 GSM Uncoated or Thin Coated PP fabric |
| Safe Working Load (SWL) | 500kg to 2,000kg |
| Safety Factor (SF) | 5:1 (Single-trip) or 6:1 (Multi-trip reusable) |
| Seam & Dust Proofing | Overlock stitching with single/double anti-sift filler cords (Dust-Proof) |
| Liner Options (Optional) | Anti-static LLDPE |
| Operating Safety Zone | Safe for combustible dusts with MIE > 3 mJ; PROHIBITED near flammable gases/solvents |
| Quality & Safety Certifications | ISO 9001:2015, ISO 21898, Type B test report, BRCGS Packaging, FDA Food Contact |
Which Industries Need Type B Big Bags?
Type B containers are widely used in sectors that process dry, finely powdered materials prone to generating static friction, where combustible dust clouds are present without flammable gas vapors.
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Food & Agriculture: Facilities bulk-handling finely milled powders such as wheat flour, tapioca starch, cornstarch, powdered sugar, milk powder, and cocoa powder. High-speed pneumatic loading of these organic powders creates static charges and airborne dust, making Type B protection essential.
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Chemical Processing: Manufacturers transporting dry chemical powders, plastic resins, pigments, synthetic catalysts, and pharmaceutical intermediates that have a Minimum Ignition Energy greater than 3 mJ.
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Mining & Mineral Processing: Refineries and processing plants shipping powdered limestone, pulverized coal, sulfur granules, and fine mineral dusts.
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Animal Feed & Grain Milling: Processing plants bulk-storing animal feeds, grain dust, and oilseed meals where dust explosion prevention is mandated by plant safety codes.
Type B vs. Type D FIBCs
Both Type B and Type D big bags provide electrostatic safety without requiring ground wires, but they operate on different physical principles and are suited for different hazard zones.
| Feature / Property | Type B FIBC | Type D FIBC |
| Anti-Static Mechanism | Controls breakdown voltage below 6 kV. | Interwoven quasi-conductive fibers dissipate charge into ambient air (corona discharge) |
| Grounding Requirement | No Grounding Needed | No Grounding Needed |
| Combustible Dust Hazards | Safe for combustible dusts with MIE > 3 mJ. | Safe for all combustible dusts regardless of MIE |
| Flammable Gas / Solvent Vapors | PROHIBITED (Cannot be used near solvent vapors) | SAFE (Can be used in environments with flammable gases/vapors) |
| Packaging Cost | Economical (Slight premium over Type A) | Premium (Significant cost increase due to patented fibers) |
Frequently Asked Questions About Type B Bulk Bags
Do FIBC Type B require groundingduring filling and discharging?
No. Type B FIBCs do not require grounding. Their anti-static safety relies entirely on limiting the fabric’s breakdown voltage, which prevents high-energy Propagating Brush Discharges (PBD) without needing ground connections or conductive wires.
What materials are Type B Bulk Bags made from?
Type B bulk bags are made from 100% virgin woven polypropylene (PP) fabric. If the bag is coated, the insulating layer or film is specially formulated and applied to ensure the total thickness does not exceed the electrical breakdown threshold.
Are Type B FIBC bags suitable for food-grade ingredients?
Yes. Fine food ingredients like wheat flour, cornstarch, and tapioca starch generate substantial static electricity during rapid pneumatic filling and present a combustible dust hazard. When manufactured inside BRCGS-certified or FDA-compliant cleanrooms, Type B food-grade bags eliminate static dust ignition risks while keeping food ingredients completely clean.
Will washing or outdoor weathering affect the anti-static properties of a Type B bag?
Washing or moisture does not diminish the breakdown voltage property, as it is an inherent physical characteristic of the polypropylene fabric thickness and coating layer. However, prolonged outdoor exposure to sunlight without sufficient UV stabilizers will degrade the physical tensile strength of the polypropylene fabric, even if the electrical properties remain unaffected.
Type B Bulk Bags are an excellent choice for businesses seeking a safe, durable, and cost-effective solution for handling and transporting non-flammable dry bulk materials. Their design, featuring static control and high durability, ensures that your materials are securely stored and transported, reducing the risk of accidents and product loss.
By investing in these high-quality bulk bags, you can enhance your operational efficiency, reduce costs, and ensure the safety of your materials. Whether you’re in agriculture, construction, chemicals, or food processing, these type B bags offer a versatile and reliable solution for your bulk handling needs.
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