We are often asked why one used container differs from another and what grades A, B or C mean. When you buy a container you hear a lot of abbreviations - IICL, CW, WWT, CSC, ACEP - and it can get confusing. In fact it is quite simple. This article explains how used containers are graded and how to choose the condition that suits you.
The main terms
- IICL (Institute of International Container Lessors) - an international organisation of the largest container rental companies. IICL sets the repair standards containers are repaired to. For used containers it is the strictest criterion: an IICL container is in very good condition.
- CW (cargo worthy) - the container is fit to carry cargo under TIR, UIC and CSC rules and meets its original specifications. A CW container usually has a valid CSC plate. An independent inspector can confirm this after examining the container.
- WWT (wind & water tight) - the container keeps out wind and water: it is fully closed and no light comes through the doors or roof. WWT containers are mainly used for storage. One becomes fit for shipping only once an inspector confirms a valid CSC plate.
- CSC (Convention for Safe Containers) - the international convention on safe containers adopted in 1972. It sets common safety rules for transporting and handling containers and requires owners to keep containers in safe condition and inspect them periodically. A CSC plate on the container shows it is approved for shipping.
- ACEP (Approved Continuous Examination Programme) - an approved programme through which owners keep track of their containers' condition. While a container is in an ACEP programme, it needs no separate CSC inspection. Once it is sold out of the programme, a new CSC inspection is needed before it can ship cargo.
- ISO - the International Organization for Standardization, which harmonises technical standards, including those for building shipping containers (for example ISO 668, 1496-1, 6346).
The grades at a glance
| Condition | What it means | Good for |
|---|---|---|
| New (one-trip) | One trip with cargo only, near-perfect | Shipping, container homes, offices, long-term use |
| IICL | Used, very good condition, few signs of use | Shipping, conversions, visible locations |
| CW (cargo worthy) | Used, valid CSC plate, fit for shipping | Shipping, storage |
| WWT (wind & water tight) | Used, wind and watertight, may not be fit for shipping | Storage, workshops, building sites |
Why A, B and C are not a standard
Many sellers sort containers into grades A, B and C. Keep in mind that this is each company's own system, not an international standard. If two firms both call a container "grade A", the containers are not necessarily in the same condition. Such grades describe the look - paint, rust and dents - more than structural strength. That is why you should always ask whether a container is CW or WWT and whether it has a valid CSC plate.
How to choose the right condition
- Say exactly what you need the container for. For storage, WWT is enough; for shipping, you need CW; for a conversion, a new or IICL container works best.
- Ask for documents. Check whether the container has a valid CSC plate and what paperwork the seller provides.
- Inspect the container or ask for photos. Check the doors, seals, roof and floor. A simple test: step inside, close the doors and look for daylight.
- Compare like with like. A lower price often means a lower grade - or a scam. Read how to avoid container scams.
A well-chosen container will serve you for a long time. See our used shipping containers, new shipping containers and containers in stock. Questions? Call +372 505 46 14 or email sales@cway.ee.