If you import DTF film or hot melt powder, your shipping experience is relatively straightforward: the product sits in cartons, the HS code determines your customs duty, and the container gets booked.
Switch to liquid consumables — DTF inks or printer cleaning solutions — and the same shipment triggers a different set of rules entirely. The product may be classified as dangerous goods. The carrier may require a transport appraisal report. And the route you choose — sea or air — dictates which report you need.
This article explains why liquids are treated differently in international shipping, what a transport appraisal report actually is, and why sea and air freight produce separate documents. If you are ordering DTF ink, UV DTF ink, or cleaning solution from an overseas supplier, understanding these reports before you book freight can prevent a shipment from being held, rejected, or reclassified at the port.
For a broader overview of import documentation — including MSDS/SDS, HS code responsibilities, and what to request from any DTF consumables supplier — start with our DTF consumables import documentation guide. This article zooms in specifically on the liquid problem.
Why liquids trigger different shipping rules
Dry consumables like DTF film rolls and hot melt powder bags are rarely a transport safety concern. They do not leak, evaporate, combust, or react during transit under normal conditions.
Liquids are different. Even a water-based ink can create risk during transport: a leaking carton can damage other cargo, a formulation with a low flash point can pose a fire hazard, and a solvent-based cleaning solution can fall under flammable liquid regulations. Carriers — shipping lines and airlines alike — treat any liquid shipment as requiring verification before acceptance.
This is not unique to printing consumables. It applies to any industrial liquid crossing a border. The difference for DTF buyers is that inks and cleaning solutions are often ordered alongside film and powder in the same container, and the liquid portion is what triggers additional documentation that the dry goods never required.
What is a transport appraisal report?
A transport appraisal report — sometimes called a transport identification report or a dangerous goods classification report — is a document issued by an accredited testing laboratory. It does two things:
- Classifies the product under the applicable dangerous goods regulation: UN number, proper shipping name, hazard class, and packing group (or confirms the product is not regulated).
- Confirms the product is safe to transport under the specified mode — sea, air, or both — when packed according to the recommended instructions.
These reports are product-specific and mode-specific. The same ink formulation shipped by sea needs one report. Shipped by air, it needs a different one. The testing criteria, documentation format, and carrier acceptance thresholds are not the same.
According to CHEMTREC, the International Maritime Dangerous Goods (IMDG) Code governs all dangerous goods shipments by sea and is mandatory for vessels carrying such cargo CHEMTREC, 2025. Meanwhile, air freight follows the IATA Dangerous Goods Regulations, which impose tighter restrictions — particularly on liquids with any flammable classification.
Sea freight transport appraisal
A sea freight transport appraisal tests and classifies the product under the IMDG Code. The report typically covers:
- UN number and proper shipping name (e.g., UN 1210, Printing Ink)
- Hazard class and packing group (if regulated)
- Marine pollutant status
- Packaging instructions and any special provisions
- Emergency response information
For many water-based DTF inks, the sea freight report may conclude the product is not regulated as dangerous goods under IMDG, meaning it can ship in a standard container without DG documentation. This conclusion is what you want to see confirmed on the report — do not assume it without a document.
Air freight transport appraisal
An air freight transport appraisal tests and classifies under IATA DGR. The thresholds are stricter. A product that is unregulated by sea may face restrictions by air because:
- The flash point limit for air freight is lower
- Viscosity exemptions that apply under IMDG may not apply under IATA
- Airlines can impose their own operational restrictions beyond the regulations
As Dimerco notes in their dangerous goods shipping guide, air freight imposes tighter packaging, labeling, and documentation requirements than ocean freight, and certain substances accepted by sea may be prohibited from air transport entirely Dimerco, 2026.
Why sea and air reports are different
It is common for importers to assume one report covers both modes. It does not. Here is why:
| Factor | Sea Freight (IMDG) | Air Freight (IATA DGR) |
|---|---|---|
| Governing regulation | IMDG Code (IMO) | IATA Dangerous Goods Regulations |
| Flash point threshold for flammable liquids | ≤ 60 °C (closed cup) | ≤ 60 °C, with additional viscosity exceptions |
| Testing laboratory accreditation | National or regional maritime authority recognition | CAAC / FAA / EASA or recognized equivalent |
| Report validity period | Typically 12 months, varies by country | Typically 12 months, varies by country |
| Packaging test requirements | UN-certified packaging per IMDG | UN-certified packaging + IATA-specific requirements |
| Carrier acceptance | Shipping line discretion on top of IMDG | Airline discretion on top of IATA; often stricter |
The practical consequence: before you book a shipment for liquid consumables, know which mode you are using and confirm your supplier has a current transport appraisal report for that specific mode.
What makes DTF inks and cleaning solutions different from each other
Not all liquid consumables face the same transport profile:
DTF water-based pigment inks (white and CMYK) are often classified as non-dangerous goods under both IMDG and IATA — if the formulation avoids high solvent content and the flash point stays above the threshold. The SDS and transport report confirm this case by case. Our DTF ink product page carries a 20KG carton reference; before shipping, the report determines whether the cartons need DG labels.
Cleaning solutions tend to be the higher-risk category. Formulations designed to dissolve dried ink from printer heads and capping stations often contain solvents with lower flash points. DGM Boston notes that printing inks and related cleaning products are primarily considered dangerous due to their flammability, and packaging must meet specific UN certification standards DGM Boston, 2023. The same logic applies to DTF and UV printer cleaning solutions: assume scrutiny until the transport report says otherwise.
UV-curable inks (UV DTF and UV flatbed) introduce an additional variable — the formulation may include reactive monomers or photoinitiators that carry their own regulatory profile. Each ink type needs its own report.
What to ask your supplier before ordering liquid consumables
When you request a quotation for DTF ink, UV ink, or cleaning solution, ask these five questions before you commit to freight:
"Can you provide the SDS/MSDS for the exact SKU I am ordering?" — The SDS tells you the chemical composition, flash point, and hazard classification that feeds into the transport appraisal. Request the current version, not a generic one. DHL's dangerous goods guide emphasizes that proper classification begins with accurate manufacturer SDS data and that errors here cascade into rejected shipments DHL Discover, 2025.
"Do you have a sea freight transport appraisal report for this product?" — If you are shipping by ocean (FCL or LCL), this is the document the carrier may request. Confirm it is within its validity period.
"Do you have an air freight transport appraisal report?" — Only needed if you plan to ship by air. If the supplier only has a sea report, do not assume air is approved.
"Which accredited laboratory issued the report?" — In China, recognized laboratories include the Shanghai Chemical Institute and Beijing DGM (Shenzhen). Reports from unrecognized sources may be rejected by carriers or destination authorities.
"Does the report name match the product name and packaging on my order?" — A report for "aqueous ink 1L bottle" does not automatically cover "cleaning solution 500ml bottle," even from the same factory. Product identity must match.
Practical steps for importers
Step 1 — Identify the liquid products in your order. Separate your PO into dry goods (film, powder) and liquids (ink, cleaning solution). The dry goods rarely need transport appraisal; the liquids almost always do.
Step 2 — Decide your transport mode before requesting documents. If you are consolidating a 20GP container, you need the sea report. If you want a faster air shipment for a trial order of ink, you need the air report. Requesting both is fine, but know which one is decision-critical.
Step 3 — Request the reports from your supplier as part of the quotation process, not after booking. A supplier who has already commissioned transport appraisal reports can provide them with the quote. A supplier who has not may need time to arrange testing (often 1–2 weeks). Build this into your timeline.
Step 4 — Share the reports with your freight forwarder or customs broker before the shipment departs. They can confirm whether the destination country accepts the classification, whether additional permits are needed, and whether the packaging meets UN requirements.
Step 5 — Keep the reports with the shipment documents. Some destination ports and customs authorities request the transport appraisal as part of clearance, particularly for chemical products. Having it on file prevents delays.
The cost of skipping this step
If you import liquid consumables without confirming the transport appraisal:
- The carrier may refuse to load the cargo at origin.
- The shipment may be held at a transshipment port for DG re-inspection.
- Destination customs may require re-testing at the importer's expense, adding weeks of delay.
- In the worst case, improperly declared dangerous goods can result in fines, container rejection, or blacklisting by the carrier.
None of these outcomes are theoretical. They happen when a buyer assumes "it is just ink" and the carrier sees an undeclared liquid in a container.
The documentation exists to prevent exactly this. A current SDS, a valid sea freight transport appraisal, and — if needed — a separate air freight report are not bureaucratic overhead. They are the difference between cargo that moves and cargo that sits.
If you are sourcing DTF inks, UV inks, or cleaning solutions and need to confirm documentation status before booking freight, request a quotation with your target SKU and destination. We will confirm which documents are available for your specific product and shipment.