FIBC/Bulk Product Guide
FIBC / Bulk Bags, Product Guide for Safe, Efficient Bulk Handling
Flexible Intermediate Bulk Containers, commonly called FIBCs or bulk bags, are built for storing and transporting dry, flowable materials at scale. This guide explains bag types, construction options, filling and discharge formats, compliance requirements, and how to choose the right specification for your operation.
FIBC Basics
Bulk bags, or Flexible Intermediate Bulk Containers, are a practical solution for handling powders, flakes, grains, fertilisers, minerals, and construction materials. They are widely used because they combine high carrying capacity with efficient storage, transport, and discharge.
Manufactured from woven polypropylene, FIBCs are designed to deliver strength, flexibility, chemical resistance, and reliable handling performance across a wide range of industrial environments.
Core Material Benefits
- Moisture resistance
- Chemical resistance
- Strong impact performance
- Fatigue resistance under handling
- Good electrical insulation
Common Custom Options
- Standard, cross corner, stevedore, or tunnel loops
- Duffle, spout, flap, conical, or flat base designs
- SWLs from 500 kg to 2000 kg
- Type A, B, C, or D constructions
- Baffle, ventilated, conical, or circular bodies
- Food grade and UN-certified options
- Custom printing up to 3 colours
Why Use FIBC / Bulk Bags
Bulk bags help businesses move more product with less handling, less packaging waste, and better warehouse efficiency. The right configuration can also improve filling speed, discharge control, and transport safety.
Flexible Specification
Tailor the bag to your product, equipment, and safe working load requirements.
Efficient Filling and Emptying
Choose top and bottom designs that suit hoppers, conveyors, and manual handling processes.
Lower Transport Costs
High payload capacity and low tare weight help reduce packaging cost per kilogram moved.
Warehouse Efficiency
FIBCs are easy to stack, store, lift, and transport using forklifts, cranes, and hoists.
Sustainability Advantages
Made from recyclable polypropylene, with multi-trip designs available for suitable applications.
Branding and Compliance
Add handling instructions, traceability details, and branded printing for a more professional finish.
Types of FIBCs, Type A, B, C and D
Electrostatic behaviour matters when handling powders and materials in combustible environments. The correct FIBC type depends on both the product being packed and the operating environment during filling, transport, and discharge.
Type A
Standard polypropylene bags with no static protection. Suitable for non-flammable materials in non-hazardous environments.
Type B
Manufactured from low breakdown voltage fabric. Suitable for dry flammable powders, but not where flammable gases or vapours are present.
Type C
Conductive or interwoven conductive fabric that must be grounded during filling and emptying. Used for flammable powders and explosive atmospheres.
Type D
Static dissipative fabric designed to safely dissipate charge without grounding. Used where electrostatic discharge control is critical.
Bag Designs
The body design of a bulk bag influences stability, storage efficiency, product flow, and how well the bag holds its shape in transport or on the pallet.
4 Panel Bags
Made from four side panels and one base panel, offering a square shape and stable stacking profile.
U Panel Bags
Constructed from two side panels and one U-shaped body panel, providing good strength and efficient production.
Circular Bags
Woven on circular looms, these bags reduce side seams and are commonly used for standard industrial applications.
Baffle Bags
Internal baffles help the bag retain a square shape, improving pallet efficiency, stacking, and container utilisation.
Ventilated Bags
Designed for products requiring airflow, such as some agricultural goods and firewood applications.
Conical Bags
Engineered to assist discharge of difficult-flowing materials by encouraging more complete emptying.
Loop Construction
Lifting loop design affects handling speed, equipment compatibility, and operational safety. Choosing the right loop style helps streamline loading and unloading.
Corner Loops
Attached at the four top corners, suitable for many standard lifting setups.
Cross Corner Loops
Sewn into the side seams, providing easier forklift tine access.
Edge Corner Loops
Positioned along the bag edges to improve lift stability in some applications.
Stevedore Loops
Additional secondary loops for crane hooks or specialised lifting arrangements.
Tunnel Lift Sleeves
Forklift-friendly side tunnels that remove the need to reach beneath the bag.
Top Filling and Bottom Discharge Options
Top and bottom construction should match how your product is filled, stored, transported, and discharged. The right design improves throughput, reduces dust, and limits product loss.
Top Options
- Open Top: Best for simple manual or open filling processes.
- Duffle or Skirt Top: Wide opening with tie closure for improved sealing.
- Filling Spout: Suitable for controlled filling from hoppers or feed systems.
- Flap Top: Protective cover over the fill opening for added containment.
Bottom Options
- Flat Bottom: A simple closed base for storage or one-way applications.
- Discharge Spout: Controlled release of contents through a tied spout.
- Full Open Discharge: Fast emptying for products needing rapid release.
- Conical Bottom: Helps improve discharge of poor-flowing materials.
Manufacturing Process of Bulk Bags
Quality bulk bags rely on controlled manufacturing processes, consistent materials, and strong quality assurance systems from tape extrusion through to final packing.
Extrusion
Polypropylene resin is melted and formed into flat tapes.
Weaving
The tapes are woven into circular or flat fabric rolls.
Lamination, if required
A film layer may be applied to improve moisture resistance.
Cutting and component preparation
Fabric is cut into panels, tops, bottoms, and spouts.
Printing and webbing
Branding and handling information are printed, and lifting loops are prepared.
Sewing and assembly
Panels, bases, tops, loops, and accessories are assembled under controlled conditions.
Inspection and testing
Finished bags are checked, with samples tested to confirm compliance and performance.
Packing and dispatch
Bags are folded, baled, palletised, and prepared for shipment.
FIBC Testing and Compliance
Bulk bags should be selected and supplied with performance, safety, and traceability in mind. Testing confirms that bags can withstand the mechanical demands of lifting, stacking, transport, and storage.
Cyclic Top Lift Test
Assesses lifting durability over repeated cycles before final rupture testing against the required safety factor.
Compression Test
Simulates stacking loads during storage and transport.
Drop Test
Evaluates the bag’s ability to contain product after handling impact.
Tear and Seam Testing
Checks the integrity of fabric and stitched construction under stress.
UV Resistance Testing
Measures performance of UV-stabilised fabric in outdoor exposure conditions.
Traceable Documentation
Available for food grade, UN-certified, and specialised bag programs where required.
Important: Single-trip bags are commonly rated to a 5:1 safety factor, while multi-trip bags are commonly rated to 6:1. Final bag selection should always match the intended application, handling conditions, and compliance requirements.
FIBC Frequently Asked Questions
What does FIBC stand for?
FIBC stands for Flexible Intermediate Bulk Container.
What sizes do bulk bags come in?
Bulk bags are available in a wide range of sizes. Common footprints include 85 x 85 cm and 90 x 90 cm, with heights varying by required volume and safe working load.
Can a bulk bag be reused?
Yes, but only when the bag is specifically manufactured and rated for multi-trip use, typically at 6:1, and inspected before each reuse.
Can I order printed bulk bags?
Yes. Custom printing is available for branding, product identification, and handling instructions, commonly up to 3 colours.
What is the difference between an open top and a duffle top?
An open top has no closure. A duffle, or skirt top, includes extra fabric that can be tied off after filling for better containment.
What does 5:1 or 6:1 safety factor mean?
The safety factor indicates the tested performance of the bag relative to its safe working load. A 5:1 bag is generally for single-trip use, while a 6:1 bag is generally for multi-trip use.
What is a baffle bag?
A baffle bag has internal panels that help it keep a square profile when filled, improving stackability and transport efficiency.
Are liners available for moisture-sensitive products?
Yes. Liners can be loose inserted, tabbed, glued, or sewn in depending on the filling process and barrier requirements.
Need bulk bags now?
Browse our stocked bulk bag range or contact our team for help with custom sizing, food grade requirements, discharge options, liners, printing, and application-specific recommendations.