By Ella Shen    Photo：CANVA

In China-U.S. chemical express operations, non-compliant DG declarations and improper packaging remain the primary causes of cargo detention, returns, delays, and penalties. U.S. Customs and DHL/UPS enforce dual standards under IATA DGR 67th Edition and 49 CFR. Liquids, powders, pastes, and chemical products with built-in batteries must all follow strict DG procedures. Any deviation not only disrupts transit times but also incurs substantial surcharges. Based on practical experience and the latest regulatory requirements, the following key operational points have been compiled.

I. Core Operating Procedures

1. Cargo Classification & Document Pre-review

Determine whether the shipment is DG cargo based on Section 14 of the MSDS, confirming the UN number, hazard class, and packing group (PG I/II/III). Simultaneously provide the Air Transport Assessment Report. DHL/UPS U.S. dedicated lanes accept only compliant chemical DG categories, including Class 9 miscellaneous, flammable liquids (within quantity limits), and low-corrosivity substances. Prohibited items include explosives, highly toxic substances, and other high-risk categories.

Important 2026 update: IATA DGR 67th Edition took effect on January 1, 2026, with upgraded requirements for lithium and sodium battery transport, and a new dedicated UN number (UN 3166 hybrid) for hybrid vehicles.

2. DG Pre-declaration & Lane Reservation

Submit the DGD (Dangerous Goods Declaration) to the carrier, detailing shipper/consignee information, UN number, proper shipping name, hazard class, packaging specifications, net/gross weight. Also upload the MSDS, Dangerous Goods Packaging Certificate, and Emergency Response Information (ERI) phone number. U.S. dedicated lanes require advance DG space reservation to avoid cargo holds due to unavailable capacity.

3. UN-Certified Packaging Execution

Adopt a three-layer structure: inner packaging + intermediate packaging + UN-certified outer packaging. Inner packaging must be leak-proof and sealed; add absorbent padding for liquids and desiccants for powders. Use bubble wrap as intermediate cushioning. Outer packaging must bear the UN mark, packing group, and country-of-manufacture code.

2026 ISTA 3A packaging test standards have been upgraded: For liquid products, an 8-hour side-leakage test is now mandatory; low-pressure testing (simulating 4,500m altitude / 60kPa) is also required for air-shipped liquids and powders. Ordinary cartons are strictly prohibited as substitutes for UN-certified packaging.

4. Labeling & Documentation Consistency

Affix primary and subsidiary hazard labels on all four sides of the outer carton (minimum size 100mm), along with GHS hazard labels, clearly indicating UN number, proper shipping name, and packing group. The commercial invoice, waybill, and DGD must be fully consistent across all three documents, and the customs declaration must include the "Dangerous Goods" notation.

Important deadline: The U.S. OSHA Hazard Communication Standard (HCS-2024) compliance deadline has been extended to May 19, 2026. Enterprises must complete SDS and label updates by this date, aligning with UN GHS 7th Revised Edition.

5. Warehouse Inspection & Transit Delivery

Shipments enter DHL/UPS dedicated DG warehouses, undergo X-ray inspection and document verification, then are loaded into unit load devices (ULDs) and prioritized for DG cargo transit. After U.S. customs clearance, final-mile delivery is executed with full tracking visibility.

II. Common High-Frequency Errors

1. Declaration errors/omissions: Incorrect UN numbers or hazard classes, missing ERI phone numbers, or expired MSDS versions leading to direct U.S. Customs detention.

2. Packaging non-compliance: Use of non-UN-certified cartons, mismatch between packaging grade and cargo, lack of absorbent material for liquids, or poor sealing for powders — all trigger return at security screening.

3. Labeling deficiencies: Hazard labels undersized or incompletely affixed, missing packing group markings, or GHS labels inconsistent with actual hazards (particularly scrutinized under HCS-2024) — leading to carrier refusal.

4. Prohibited mixing: Mixing different DG classes together, or mixing DG with general cargo, triggering safety alerts due to chemical reaction risks.

5. Incomplete documentation: Shipping with only MSDS and lacking the Dangerous Goods Packaging Certificate or Air Transport Assessment Report — failing to meet bilateral China-U.S. transport requirements.

III. Practical Compliance Recommendations

1. Prepare documents in advance: Organize MSDS, assessment reports, packaging certificates, and DGD forms 7 days prior to shipment, ensuring all information is aligned. During the HCS-2024 transition period, enterprises may choose to apply either the old or new standard.

2. Strictly follow packaging standards: Use UN-certified packaging within its validity period; employ leak-proof inner containers for liquids and double-sealed layers for powders. Ensure no voids inside the carton, no cargo movement, and reinforce closures with cross-taping.

3. Ensure precise declaration: Complete the DGD strictly per IATA DGR 67th Edition standards. Never misdeclare, omit, or attempt to pass low-risk chemicals as general cargo.

4.Choose professional DG channels: Select forwarders with DG operating credentials and secure DHL/UPS U.S. dedicated DG lanes — never mix with standard non-DG routes. Both DHL and UPS require DG shippers to hold a carrier contract and complete mandatory compliance training.

5. Build compliance into early production: Integrate packaging and labeling requirements at the manufacturing stage itself, avoiding last-minute retrofits and reducing exception-related costs.

For chemical shipments via U.S. express lanes, compliance is the baseline, and details make the difference. With DHL/UPS intensifying DG scrutiny, only full-process adherence to declaration, packaging, and documentation standards ensures smooth customs clearance and on-time delivery.

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