Cyclohexanone (CAS RN 108-94-1; EC 203-631-1) is a cyclic ketone that enters export logistics as a flammable liquid rather than as a general solvent. Commercial specification sheets from production-scale distillation commonly list assay not less than 99.8 % by GC area, water not more than 0.10 % by mass, and acidity as acetic acid not more than 0.01 % by mass. At 20 °C, density is approximately 0.947 g/cm³, boiling point is 155.6 °C at 101.3 kPa, vapour pressure is approximately 0.45 kPa, and closed-cup flash point is approximately 44 °C. Because the flash point lies between 23 °C and 60 °C, the substance is assigned to Class 3 flammable liquid, Packing Group III, under UN 1915, with the proper shipping name Cyclohexanone. The DG documents & surcharge for cyclohexanone exports therefore derive from a moderate-flammability solvent classification that still requires control of vapour-space ignition risk during ocean, road, and air transport. The dominant industrial uses—oxidation feedstock for caprolactam, solvent in coatings and adhesives, and processing agent in pesticide and pharmaceutical manufacturing—do not alter the transport classification, although purity and water content can influence packaging compatibility and vapour handling.

Why does the Dangerous Goods Declaration control cargo acceptance for UN 1915?

The Dangerous Goods Declaration functions as a legal attestation that the consignment is properly classified, packed, marked, labelled, and documented. Under the IMDG Code Part 5, Chapter 5.4, the document must contain the proper shipping name Cyclohexanone, UN number 1915, Class 3, Packing Group III, number and type of packagings, total quantity, and the shipper’s emergency contact. In United States surface transport, the same function is embedded in the hazardous materials shipping paper under 49 CFR 172.200; in European road transport, the ADR transport document uses the data fields set out in ADR 5.4.1.1. Airfreight acceptance requires the IATA Shipper’s Declaration for Dangerous Goods, and a shipment declared as UN 1915 may not be consolidated with incompatible classes unless segregation has been verified against the applicable IATA Dangerous Goods Regulations edition. Container lines review the DGD before issuing a booking confirmation because an incomplete DGD is treated as a compliance failure rather than a clerical defect.

Ocean carriers impose the dangerous goods surcharge as a separate tariff line from ocean freight, bunker adjustment, terminal handling, and customs duties. The surcharge compensates the carrier for operational constraints created by UN 1915: restricted terminal stack position, increased fire separation, additional checks on container condition, and mandatory dangerous-goods storage intervals at certain ports. For cyclohexanone, the Packing Group III assignment normally places the shipment in a lower-cost Class 3 surcharge band than Packing Group I or II cargo; however, the actual amount is route-specific, carrier-specific, and contract-specific. Published universal surcharge data for this specific configuration is limited because carriers revise dangerous-goods tariffs through general rate increases, surcharge notices, and branch-specific addenda. A shipper should compare surcharge treatment across ocean, road, and rail because the cost driver is often terminal Class 3 handling capacity rather than the product itself. DG document errors can indirectly increase surcharge exposure when a booking is downgraded, delayed, or shifted to a premium hazardous slot.

When product temperature exceeds the 44 °C closed-cup flash point during export transit

Flash point is not a static property if the cargo is heated by ambient conditions. In Middle East and South Asia port operations during summer, ISO tank container surface temperatures can exceed 60 °C; uninsulated steel drums stored on open quay lines can reach product temperatures above 44 °C within several hours. Once the liquid temperature passes the closed-cup flash point, the vapour space becomes flammable at ambient pressure, and the risk profile changes from ordinary Class 3 Packing Group III stowage to one requiring inert-gas padding, vapour-pressure monitoring, and restricted venting. Tank containers used for bulk cyclohexanone are commonly fitted with pressure/vacuum valves and inerting connections; a nitrogen pad with a residual oxygen level below 8 % by volume is a standard control, though the required oxygen limit must be verified against the relevant vessel or terminal safety case. Some carriers will not accept non-inerted bulk cyclohexanone if the stated product temperature at loading exceeds 44 °C. For drummed shipments, UN 1A1 tight-head steel drums with closures that maintain a seal against vapour loss are the preferred equipment; plastic drums are generally unsuitable for hot-climate cyclohexanone exports because of permeation and static-decay requirements. In all cases, the shipper must compare the shipment’s worst-case transit temperature, not the laboratory sample value, with the flash point shown on the Dangerous Goods Declaration.

Physical packing for cyclohexanone export falls into three equipment categories: UN-approved steel drums for small lots, rigid or composite intermediate bulk containers for intermediate volumes, and ISO stainless steel tank containers for bulk cargo. For steel drums, the standard configuration is the 1A1 tight-head drum with an internal epoxy phenolic lining; for IBCs, a 31A or 31HA1 IBC with vapour-tight closure and conductive framework is used. Bulk maritime shipments often use a T11 ISO tank container with a maximum allowable working pressure of 4.0 bar and top or bottom loading. Because cyclohexanone is a solvent with moderate electrical conductivity, transfer operations require dedicated earthing and bonding. The loading line should be bottom-filled or dip-tube filled to reduce free-fall static charge; inert gas blanketing is used where flash-point margins are narrow. In drums and IBCs, fill ratio should not exceed the regulatory maximum, often 95 % liquid capacity at 20 °C, to leave sufficient vapour space for thermal expansion. Improper fill ratio is a routine rejection point at container freight station inspection.