UN Packaging Requirements: A Shipper's Guide to DG Packaging Standards

UN-certified packaging is one of those things that sounds straightforward until you actually try to procure it in India. Then you realise that not every supplier selling "UN approved" boxes actually has a valid test certificate, and not every test certificate covers the packing group you need.

Here's a practical guide to what UN certification actually means and how to verify you're getting the real thing.

Why Packaging Needs UN Certification

Under IATA DGR, dangerous goods must be packed in packaging that has been tested and certified to UN performance standards set out in the UN Model Regulations (the "Orange Book"). The tests — drop, stack, leakproof, hydraulic pressure — simulate the worst conditions the package might face in transport.

If your packaging hasn't passed these tests, it doesn't matter how well you've packed the contents. The shipment will be rejected.

Reading the UN Mark

Every UN-certified package has a marking on it. It looks something like this: UN 4G/Y/S/23/IN/XYZ123. Let's break that down:

• 4G — Type of package (4G = fibreboard box)
• Y — Packing group suitability (X = I, II, III; Y = II, III; Z = III only)
• S — For solids or S for liquids testing
• 23 — Year of manufacture
• IN — Country of approval (India)
• XYZ123 — Manufacturer's code assigned by CPCB (India's testing authority)

The packing group letter is critical. If your DG substance is Packing Group II and your box is marked "Z" (only suitable for PG III), that's non-compliant. Airlines reject it.

How to Verify a Supplier in India

In India, UN packaging certification is done through CPCB-approved test laboratories. Legitimate manufacturers can provide a test report from one of these labs. Ask for the report — not just a certificate. The report shows what tests were conducted and the results.

If a supplier gives you a generic certificate with no test laboratory name or report number, be suspicious. We've seen cases where boxes were sold as "UN approved" with no actual test documentation behind the claim.

Common Mistakes

Mixing up inner and outer packaging is surprisingly common. The UN certification applies to the combination — specific inner containers inside a specific outer box. You can't swap out the inner bottles for a different size and assume the certification still holds.

Another mistake: using damaged packaging. Even a perfectly certified box that's been dented or had its liner torn is no longer acceptable. Acceptance staff do physical checks.

Special Cases — IBCs and Large Packaging

Intermediate Bulk Containers and large packaging (LP) for quantities exceeding the PI limits for combination packaging follow slightly different rules. If you're shipping in IBCs, your supplier needs to hold IBC-specific UN certification, not just standard packaging certification. These are different test series.

When in doubt, call the manufacturer and ask for the specific test report for your UN number, packing group, and packaging combination. If they can't produce it, find a different supplier.