An Intermediate Bulk Container is a reusable industrial container designed for the transport and storage of liquids and bulk solids, typically holding 1,000 litres (1 cubic metre). The standard IBC is a steel-cage outer frame with a translucent HDPE inner bottle on a wooden, plastic, or metal pallet, with a top filling port and a bottom dispensing valve. UN-certified IBCs ship dangerous goods. The IBC sits between drums (200-220 kg per drum) and ISO tanks (16-25 MT per tank) on the chemical packaging size spectrum. For chemical buyers it is the standard mode for parcel-size DG liquid cargo and many bulk-solid commodities.
IBC types and UN codes
The IMDG packaging code system identifies IBC types:
| UN code | Description | Use |
|---|---|---|
| 11A, 11B, 11D, 11G, 11H1, 11H2, 11N | Composite IBC, solid contents | Bulk solids in big-bag-style IBCs |
| 13H1, 13H2, 13H3, 13H4 | Flexible IBC (FIBC / big bag), solid contents | Granular and powdered solids |
| 21A, 21B, 21D, 21G, 21H1, 21H2 | Composite IBC, liquid contents | Bulk liquids |
| 31A, 31B, 31N | Metal IBC | Liquids requiring metal compatibility |
| 31H1, 31H2 | Plastic IBC, liquid contents | Most chemical liquid IBC use |
| 31HA1, 31HA2 | Composite IBC (plastic inner with metal cage), liquid contents | Standard for hazardous liquids |
| 31HZ1, 31HZ2 | Composite IBC (plastic inner with metal cage and partial inner protection) | Higher-hazard liquids |
For chemical buyers the codes most often seen are 31HA1 (the standard cage IBC for routine DG liquids) and 31H1 (the all-plastic IBC for non-DG or low-hazard liquids).
The marking on a UN-certified IBC reads: UN code, packing group letter (X for PG I, Y for PG II, Z for PG III), test gross mass, year of manufacture, country code, manufacturer ID, and stack-test rating.
Standard IBC dimensions and capacity
Most IBCs converge on standard dimensions to fit container loading:
| Dimension | Typical |
|---|---|
| Length | 1200 mm |
| Width | 1000 mm |
| Height | 1150-1200 mm |
| Empty mass | 50-65 kg |
| Capacity | 1,000 L nominal (1,050 L brimful) |
| Pallet | Wood, plastic, or steel base |
A standard 20-foot container fits 16-18 IBCs depending on door clearance and pallet style. A 40-foot container fits 32-40 IBCs. For volume buyers running IBC-format chemical imports, the per-container fit is the key economics input.
When IBC is the right packaging
IBC is the right choice for:
- Liquid chemicals at parcel scale (5-20 IBCs per shipment) where ISO tanks are uneconomic and drums are administratively heavy
- Specialty chemicals at production-buyer scale (a buyer using 1-5 MT per month of a specific chemical)
- Cargo that benefits from in-place storage at destination (the IBC can sit at the buyer’s site for weeks of dispensing without reloading)
- Bulk solids in FIBC format for granular and powdered chemicals at 1-2 MT scale per IBC
When IBC is the wrong packaging
IBC is wrong for:
- Volume bulk shipments above ~50 MT per shipment. ISO tanks are more economical
- Very small parcels under ~500 kg total, drums or smaller packagings fit better
- Cargo requiring temperature control. IBC thermal mass is unfavourable; drums or temperature-controlled containers are better
- Cargo with strong UV or oxidation sensitivity, translucent HDPE bottles allow light penetration that some chemistries cannot tolerate
Reusability and cleaning
IBCs are designed for multiple use cycles. After dispensing, the IBC can be cleaned, refurbished, and reused. Three operational paths:
- Reconditioned IBCs, collected by IBC service companies, inspected, cleaned, and resold for reuse. The reconditioning industry is mature in major markets.
- Disposable single-use IBCs, for cargoes where cleaning is impractical or contamination-sensitive (food-grade chemicals, pharmaceutical intermediates). The IBC is typically destroyed after use.
- Customer-owned IBC fleet, for high-volume specific buyers, owning the IBC fleet and cycling them through the supply chain. Common in long-term supply contracts.
For UN-certified IBCs, recertification is required every 2.5 years for liquids and every 5 years for solids per IMDG rules. A reconditioned IBC with expired UN certification cannot ship DG cargo until recertified.
Operator note: the cage-vs-cleanliness tradeoff
The translucent HDPE inner bottle of a 31HA1 IBC is visible through the cage. After heavy use the bottle accumulates surface staining and abrasion that can look concerning even when the IBC is structurally sound. Some buyers reject reconditioned IBCs on visual inspection without confirming the structural recertification status. For routine industrial chemicals the visual condition is cosmetic; for food-grade or pharma-grade cargo the visual standard does matter and new IBC is the right choice.
Related terms
ISO tank is the next size up, 18-25 MT per container vs the 1 MT IBC. Drum is the next size down, 200-220 kg vs the 1 MT IBC. Twenty-foot container typically holds 16-18 IBCs. IMDG Class 8 corrosives are routinely shipped in 31HA1 IBCs.