This guide explains what PSN means, where to verify it, how N.O.S. entries work, and why a wrong PSN can lead to booking rejection, document correction, port holds, and destination clearance risk.
VCEN note
For dangerous goods export, the answer is rarely based on one document alone. Cargo attributes, packaging, carrier acceptance, port requirements, and declaration documents should be reviewed together before booking.
Why exporters often overlook PSN
Customers naturally describe cargo by product names, brand names, or familiar trade names. These names are useful for sales and production, but they are not accepted as transport names in dangerous goods shipping.
Carriers, terminals, customs, and destination agents all need one globally standardized legal name that maps to the correct UN number, hazard class, packing group, special provisions, and emergency response requirements. That name is the Proper Shipping Name, or PSN.
Core concept
A trade name belongs to commercial language. A PSN belongs to regulatory language. The shipper can decide whether to ship the cargo, but cannot replace the PSN with a brand or product nickname.
What is PSN and where should it be checked?
Under IMDG Code, each dangerous goods entry in the Dangerous Goods List has a legal Proper Shipping Name. It must be written in English and should match the DGL wording, including spelling, commas, and qualifying terms where required.
| Source | Purpose | Key caution |
|---|---|---|
| SDS Section 14 | Fast entry point for UN number and PSN | Check whether the SDS is current and whether the wording is complete |
| IMDG Code DGL | Final authority for PSN verification | Verify the UN entry, class, packing group, and special provisions |
Common trap
Some SDS documents contain non-standard PSN wording in Section 14. A missing comma, missing qualifier, or outdated wording may be enough for a carrier system or DG reviewer to reject the booking.
N.O.S. entries: the most misunderstood PSN concept
N.O.S. means Not Otherwise Specified. It is used when a dangerous product cannot be assigned to a more specific DGL entry but still belongs to a defined hazard type.
| Part | Meaning | Example |
|---|---|---|
| Hazard prefix | Main hazard type | FLAMMABLE LIQUID / CORROSIVE SOLID / TOXIC LIQUID |
| Physical or chemical qualifier | State or characteristic | LIQUID / SOLID / ORGANIC / INORGANIC |
| N.O.S. | Not otherwise specified | Indicates a generic catch-all entry |
Key rule
When an N.O.S. entry is used, the PSN generally needs the technical name in brackets, such as FLAMMABLE LIQUID, N.O.S. (contains methanol and acetone). Without the technical name, DGD review is very likely to be rejected.
What happens if the PSN is wrong?
Booking rejection
Carrier booking systems and DG reviewers check whether PSN and UN number match. If the PSN is not recognized or does not match the UN entry, the booking may be rejected immediately.
Packaging mismatch
A wrong PSN may lead to a wrong packing group or wrong packing instruction. This can result in incompatible UN packaging and cargo holds during terminal inspection.
Destination clearance risk
If the PSN on the bill of lading, DGD, and destination documents is inconsistent, customs clearance may be delayed or refused at destination.
PSN checklist before shipment
- Does SDS Section 14 clearly show the PSN, not only the UN number?
- Has the PSN been checked against the IMDG Code DGL?
- If an N.O.S. entry is used, is the technical name included in brackets?
- Is the PSN exactly consistent across DGD, booking form, customs documents, and bill of lading?
- Has the PSN been reviewed again after product name, formula, or composition changes?
- Does the destination country have any special restriction for this PSN?
Three things not to do
Do not replace PSN with a brand name. Do not guess PSN when SDS Section 14 is unclear. Do not allow different PSN wording across DGD, booking form, and bill of lading.
How VCEN supports PSN review
| Step | VCEN review | Customer cooperation |
|---|---|---|
| 1 | Review SDS Section 14 for PSN completeness | Provide the latest SDS |
| 2 | Cross-check PSN wording against IMDG Code DGL | Confirm actual product composition |
| 3 | Assess whether N.O.S. and technical name are required | Provide component and CAS information |
| 4 | Align PSN across DGD, booking, customs, and BL templates | Review document consistency |
| 5 | Check carrier acceptance for the PSN and route | Provide shipment route and schedule needs |
VCEN reminder
PSN review is not a decorative document step. It is the first checkpoint before dangerous goods booking and declaration.
Key points
PSN is not created by the shipper. It must be selected from the IMDG Code Dangerous Goods List.
SDS Section 14 is only the entry point. The final PSN should be verified against the DGL.
N.O.S. entries normally require a technical name in brackets.
PSN must remain consistent across DGD, booking form, customs documents, and bill of lading.
A wrong PSN can affect UN number, hazard class, packing group, carrier acceptance, and destination clearance.
