Product Description
Type B FIBC Bag is purpose-engineered for industries that handle dry, combustible powders in environments where flammable gases and vapours are absent. While visually similar to standard Type A bulk bags, Type B bags are manufactured from a specialised polypropylene fabric with a low breakdown voltage — scientifically proven to prevent Propagating Brush Discharges (PBD), the most energetic and dangerous form of electrostatic discharge that occurs on the surface of bulk bag fabric.
Manufactured at our ISO-certified facility in Vietnam, every Type B FIBC bag is tested to IEC 61340-4-4 standards and supplied with full electrostatic discharge test documentation — giving procurement teams, safety officers, and compliance managers the verified evidence they need.
Type B vs Other FIBC Types — Quick Guide
Understanding where Type B fits in the FIBC safety classification is essential for correct product selection:
- Type A — No static protection. Suitable for non-flammable materials only.
- Type B — Low breakdown voltage fabric. Prevents PBD. Safe for dry flammable powders where NO flammable gases or vapours are present.
- Type C — Conductive fabric with grounding. Safe for flammable powders AND flammable gas environments.
- Type D — Dissipative fabric. Safe for flammable environments without grounding.
Why Choose This Bag?
- Prevents Propagating Brush Discharges (PBD) — the highest-energy electrostatic hazard on FIBC surfaces
- No grounding or conductive connections required — simpler to operate than Type C
- Tested to IEC 61340-4-4; electrostatic discharge test reports supplied with every order
- Cost-effective safety upgrade over Type A for combustible dust environments
- Available in circular, U-Panel, and 4-Panel constructions with full range of top/bottom options
| ⚠️ SAFETY NOTE: Type B bags must NOT be used in the presence of flammable gases, flammable solvents, or vapours. For such environments, use Type C (grounded) or Type D (dissipative) FIBC bags. |
Typical Applications
- Dry chemical powders with Minimum Ignition Energy (MIE) > 3 mJ
- Combustible mineral powders (calcium carbonate, silica, fly ash)
- Pharmaceutical dry powders and excipients (non-vapour environments)
- Food powders: flour, sugar, starch, milk powder (combustible dust zones)
- Plastic resins and polymer granules with static sensitivity
Technical Specifications
| Type Classification | Type B (IEC 61340-4-4) |
| Breakdown Voltage | < 6 kV (prevents Propagating Brush Discharge) |
| Suitable For | Dry flammable powders; MIE > 3 mJ; NO flammable gases/vapours |
| NOT Suitable For | Environments with flammable gases, solvents, or vapours |
| Construction Options | Circular / U-Panel / 4-Panel |
| Safe Working Load (SWL) | 500 kg – 2,000 kg |
| Safety Factor | 5:1 (single-use) / 6:1 (multi-trip) |
| Fabric | 100% Virgin PP, low breakdown voltage, UV-stabilised |
| Fabric Weight (GSM) | 100 – 250 gsm |
| Coating | Coated or Uncoated |
| Lifting Loops | 4 corner loops (cross-corner available) |
| Top Options | Open top / Spout top / Duffle top |
| Bottom Options | Flat bottom / Discharge spout / Conical discharge |
| Liner | Optional PE or foil liner (see liner product page) |
| Printing | Up to 4-colour flexographic printing |
| Test Standard | IEC 61340-4-4; ISO 21898 |
| Certification | SGS tested; electrostatic test report supplied |
Frequently Asked Questions
Q1: What does ‘low breakdown voltage’ mean for Type B FIBC bags?
Breakdown voltage refers to the electrical voltage at which a fabric material allows charge to pass through it. Type B FIBC bags are manufactured from fabric with a breakdown voltage below 6 kV (tested to IEC 61340-4-4). This prevents the occurrence of Propagating Brush Discharges (PBD) — the dangerous, high-energy sparks that can ignite combustible dust clouds.
Q2: Do Type B bags require grounding during filling and discharge?
No. Unlike Type C bags, Type B FIBC bags do not require grounding. The safety mechanism is built into the fabric material itself. This makes Type B operationally simpler — no grounding cables, no ground resistance checks before each use.
Q3: How do I know if Type B is the right choice for my product?
Type B is suitable when your product is a dry, combustible powder with a Minimum Ignition Energy (MIE) greater than 3 mJ, AND your handling environment contains no flammable gases, solvents, or vapours. If vapours or gases are present, you must use Type C or Type D. If you are unsure, we recommend consulting your site safety engineer and requesting our electrostatic hazard assessment guide.
Q4: What certifications and documentation do you provide with Type B bags?
Every order of Type B FIBC bags is supplied with: IEC 61340-4-4 electrostatic test report from an accredited laboratory, ISO 21898 structural conformity declaration, SGS quality inspection report, and batch traceability records. Additional ATEX-related documentation is available on request.
| Confirm Type B FIBC bag meets your safety requirements — contact our team for IEC 61340-4-4 test reports, samples, and pricing.
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