General terms
| FIBC | Flexible Intermediate Bulk Container: a "bulk bag" or "super sack". |
| SWL | Safe Working Load: the maximum rated fill weight. |
| Safety factor (SF) | Break load ÷ SWL: 5:1 single-trip, 6:1 multi-trip (UN / food). |
| Spout | Tubular fabric inlet (top) or outlet (bottom) for filling / discharging. |
| Tare | Weight of the empty bag. |
| Liner | Inner bag (PE or barrier film) for moisture / contamination protection. |
| PBD | Propagating brush discharge: the energetic static discharge that Type B / C / D fabrics prevent. |
| GSM / denier | Fabric weight (grams per m²) and yarn thickness: they set strength & permeability. |
FIBC types
Common FIBC types include: Duffle Top, Baffle Bag (Q-Bag), U-Panel, 4-Panel, Circular / Tubular, Full Open.
| Duffle top | Wide fabric skirt that ties closed over the fill opening: covers the full bag width. |
| Baffle bag (Q-bag) | Internal corner baffles hold a square shape when filled: more cube fill & tighter stacking. Also called form-stable. |
| U-panel | Body from one U-shaped piece (two sides + base) + two end panels: the most common, cost-effective construction. |
| 4-panel | Body from four side panels + a base; holds a squarer shape for heavier / denser loads. |
| Circular / tubular | Seamless woven-tube body (no side seams), stitched only at the top & base; favored for food-grade & fine powders. |
| Full open | A top or bottom that opens completely: full-open top for fast filling; full-open (drop) bottom to dump non-flowing product at once. |
Static-control sub-types (electrostatic)
| Type | Use |
|---|
| Type A | Plain woven PP, no static protection. Only non-flammable products in non-flammable atmospheres. |
| Type B | Low breakdown-voltage fabric (prevents propagating brush discharges). No grounding; not for flammable atmospheres. |
| Type C | Conductive / groundable: must be bonded & earthed. For combustible dusts / flammable atmospheres. |
| Type D | Antistatic / dissipative: dissipates charge without grounding. For combustible dusts / flammable atmospheres. |
Loop type
| Lifting loops (standard) | Four corner loops sewn at the corners, standing upright: the default lift. |
| Cross-corner | Loops sewn diagonally across the corners; fold flat and self-open under a fork. |
| Stevedore / single loop | One or two central loops for crane / hook lifting. |
| Sleeve (hood) lift | Fabric sleeve in place of loops; a lifting bar passes through. |
FIBC optional features
| UN-certified | Tested & marked for shipping hazardous (dangerous-goods) materials. |
| Document pouch | Sewn-on sleeve that holds paperwork / labels. |
| Ventilated | Breathable fabric or mesh stripes for products that must "breathe" (e.g. produce, firewood). |
| Coated (vs uncoated) | A PP laminate that lowers permeability to fines / moisture, vs bare woven PP. |
| Petal / dust cover | Fabric flap that protects and ties over a spout. |
| Drop bottom (full open) | Base that opens completely to dump non-flowing product at once. |
| Conical bottom | Cone-shaped base that channels dense or sticky product to the spout. |
| Tie closure | Drawstring tie that seals a spout. |
| Iris closure | Iris valve that seals the discharge spout. |
| Reinforced lifting loops | Extra-strength or extended loops for a higher SWL or specific lifting gear. |
