Extended Operational and Trade Vocabulary

IMDG Code, Classes, Packing and Segregation glossary

The dangerous-goods vocabulary anchored in the IMDG Code: the hazard classes, packing groups and provisions, segregation tables, the EmS fire and spill schedules, acceptance checks under IMDG 1.4, and on-deck accessibility for firefighting. Grounds each term in the IMDG Code provision that governs the carriage of packaged dangerous goods.

1120 defined terms.

Showing 250 on this page (page 1 of 5).

A

AAR: Average Adjuster's Report; settlement document apportioning general average contributions.
Abandonment of Voyage: Carrier decision to terminate a dangerous goods voyage under IMDG emergency response, triggering port of refuge procedures.
ABC Dry Chemical: Multipurpose fire extinguishing agent referenced in EmS fire schedules for Class 3, 4 and electrical fires aboard ships.
Acceptance Check: Pre loading inspection of dangerous goods packages, marks, labels and documentation by carrier or terminal under IMDG 1.4.
Accessibility: The percentage of time during which sea state and weather permit safe technician transfer from a CTV or SOV to a wind turbine boat landing or gangway.
Acetaldehyde: UN 1089, Class 3 flammable liquid Packing Group I, with flash point below minus 38 degrees Celsius.
Acetic Acid Glacial: UN 2789, Class 8 corrosive with Class 3 subsidiary risk, Packing Group II, segregation group SGG1 acids.
Acetone: IBC Code noxious liquid (Chapter 17), flammable solvent carried in chemical tankers.
Acetonitrile: UN 1648, Class 3 flammable liquid Packing Group II with toxic hazard noted in EmS schedules.
Acetyl Chloride: UN 1717, Class 3 with Class 8 subsidiary risk, water reactive and assigned segregation away from foodstuffs.
Acetylene Dissolved: UN 1001, Class 2.1 flammable gas in porous mass with acetone, IMDG stowage category E.
Acid: Substance that releases hydrogen ions in water, grouped in IMDG segregation group SGG1 with cross hazard considerations.
Acid Sensitive Material: Cargo that reacts dangerously with acids and must be segregated under IMDG 7.2.4 from SGG1 substances.
ACR: Authorized Container Repair under CSC Convention, prerequisite for any CTU offered for IMDG carriage.
Activation Energy: Threshold energy required to initiate decomposition of self reactive Class 4.1 or organic peroxide Class 5.2 substances.
Active Material: Quantity of radionuclide in a Class 7 consignment expressed in becquerels for transport index calculation.
Acute toxicity: Short-term toxic effect of a discharge or biocide on test organisms, used in BWMS approval under MEPC.300(72).
Additives: Substances added to desensitize self reactive Class 4.1 or organic peroxide Class 5.2 entries to reach SADT thresholds.
ADN: Accord europeen relatif au transport international des marchandises Dangereuses par voies de Navigation interieures, concluded 2000, in force 28 February 2008, governing dangerous goods on inland…
ADR: European Agreement concerning the International Carriage of Dangerous Goods by Road.
Aerosols: UN 1950, Class 2 articles regulated under IMDG with specific pressure and capacity limits per packaging.
Affreightment Contract: An agreement by which a carrier undertakes to transport goods by sea for freight, embracing both charterparties and bills of lading.
Aft Section: Stern stowage area of a container vessel often selected for Class 1 or temperature sensitive Class 5.2 cargo by ship plan.
Agency Notification: Pre arrival notification to port state of dangerous goods quantities and classes under SOLAS VII regulation 6.
Agents Authorized to Sign DG Declaration: Shipper or duly authorized representative who signs the Multimodal Dangerous Goods Form under IMDG 5.4.1.6.
Air Bag Inflator: UN 0503 Class 1.4G or UN 3268 Class 9, safety device with specific IMDG special provisions.
Air Eductor: Pump using compressed air to remove spilled liquids in cargo holds per EmS spill schedules.
Alcoholic Beverages: UN 3065, Class 3 flammable liquid with concessions for retail packagings above stated alcohol content.
Aldol: UN 2839, Class 6.1 toxic liquid Packing Group II.
Alkali Metals: Class 4.3 substances such as sodium UN 1428 or potassium UN 2257 that liberate flammable gas in contact with water.
Allyl Alcohol: UN 1098, Class 6.1 with Class 3 subsidiary risk, Packing Group I, requires inhalation protection.
Aluminium Alkyls: UN 3051, 3052 pyrophoric Class 4.2 with Class 3 subsidiary risk, pyrophoric label required.
Aluminium Phosphide: UN 1397, Class 4.3 with Class 6.1 subsidiary risk, liberates toxic phosphine on contact with water.
Aluminium Powder Coated: UN 1309, Class 4.1 flammable solid with Packing Group II or III depending on particle size.
Aluminium Powder Uncoated: UN 1396, Class 4.3 dangerous when wet.
Ambient temperature: Outside air temperature surrounding the reefer; influences pull-down time and compressor duty cycle.
Ammonia Solution: UN 2073 or UN 2672, Class 2.2, 6.1 or 8 depending on concentration, segregated from chlorine.
Ammonia, Anhydrous: Carried refrigerated (-33 C) on fully refrigerated LPG/ammonia carriers; toxic.
Ammonium Nitrate Based Fertilizer: UN 2067 Class 5.1 or UN 2071 Class 9 depending on composition under IMDG 2.5.3.
Ammunition: Articles of Class 1 with explosive content, UN numbers ranging across Division 1.1 to 1.4 by hazard.
Amyl Acetate: UN 1104, Class 3 flammable liquid Packing Group III.
Anhydrous: Descriptor meaning without water, critical for accurate classification of substances such as anhydrous hydrofluoric acid UN 1052.
ANSI: American National Standards Institute, source of US recognized standards referenced in some IMDG portable tank designs.
Antimony Pentafluoride: UN 1732, Class 8 corrosive with Class 6.1 subsidiary risk, Packing Group I.
Approval Authority: Competent authority that approves IMDG packaging designs, portable tanks and Class 7 packages, often a national regulator.
Approved Continuous Examination Program: ACEP plate on CSC container indicating ongoing inspection regime acceptable for IMDG carriage.
Argon Compressed: UN 1006, Class 2.2 non flammable non toxic gas commonly shipped in cylinders.
Argon Refrigerated Liquid: UN 1951, Class 2.2 with cryogenic temperature handling per IMDG portable tank instruction T75.
Arsenic: UN 1558, Class 6.1 toxic solid Packing Group II.
Article: IMDG term for a manufactured item containing one or more dangerous substances such as ammunition or aerosol.
Asbestos Amphibole: UN 2212, Class 9 miscellaneous dangerous good with regulated handling and labeling.
Asbestos Chrysotile: UN 2590, Class 9 with Packing Group III and specific stowage codes.
Asphalt: Not regulated unless transported hot, in which case UN 3257 Class 9 elevated temperature substance applies.
Assigned Stowage Category: Letter A, B, C, D or E given in column 16a of the Dangerous Goods List for each UN entry.
Audit Trail: Documented chain of survey evidence including photos, logs, and instrument records.
Authorized Person: Individual qualified under IMDG 1.3 training requirements to perform classification, packing or documentation.
Auto Ignition Temperature: Minimum temperature at which a substance ignites without external flame.
Aviation Regulated Liquid NOS: UN 3334, Class 9 liquid regulated only for air transport, generally not regulated under IMDG.
Away From: Segregation term in IMDG 7.2.1 requiring sufficient distance to prevent mutual hazardous interaction.

B

Bag: Flexible packaging made of paper, plastic or textile, IMDG packaging codes 5H1 to 5M2 depending on material.
Bagged cargo: Dry bulk commodities carried in bags rather than loose.
Bale: Compressed unit of flexible material, regulated as dangerous goods only when meeting specific UN entries such as cotton wet UN 1365.
Barge: Tank vessel used for bunker delivery alongside ocean-going ships in port and at anchorage.
Barium Azide Dry: UN 0224, Class 1.1A explosive primary substance.
Barium Chlorate Solid: UN 1445, Class 5.1 oxidizer with Class 6.1 subsidiary risk.
Barium Compounds NOS: UN 1564, Class 6.1 toxic substance NOS entry.
Basic Description: Mandatory sequence on the DG declaration of UN number, PSN, class, subsidiary risk in parentheses, packing group and quantity.
Battery Electric Storage: General category covering UN 3480, 3481, 3090, 3091 and related lithium and sodium entries.
Battery Fluid Acid: UN 2796, Class 8 corrosive sulfuric acid based.
Battery Fluid Alkali: UN 2797, Class 8 corrosive potassium hydroxide based.
Battery Powered Equipment: UN 3171 Class 9 entry for equipment such as wheelchairs or lawn mowers containing wet batteries.
Battery Powered Vehicle: UN 3171, Class 9, regulates vehicles propelled by wet batteries or sodium batteries.
Becquerel: SI unit of radioactivity, fundamental measure for activity content in Class 7 IMDG consignments.
Below Deck: Stowage location inside cargo holds, often required for Class 1, 7 and some Class 4.2 substances.
Benzene: IBC Category Y, toxic aromatic; vapor monitoring required.
Benzyl Chloride: UN 1738, Class 6.1 with Class 8 subsidiary risk, Packing Group II.
Beryllium Powder: UN 1567, Class 6.1 with Class 4.1 subsidiary risk.
Bilge Pumping: Removal of accumulated water from machinery and cargo spaces during refloating operations.
Bills of Lading: Shipping document that must reflect IMDG basic description and refer to the Multimodal Dangerous Goods Form.
Biological Agent: Microorganism or toxin capable of causing disease, regulated under Class 6.2 with categories A and B.
Biological Substance Category B: UN 3373, Class 6.2 entry for substances that do not meet Category A criteria.
Biomedical Waste: Waste containing infectious substances, regulated under UN 3291 Class 6.2.
Bisulfites Aqueous Solution NOS: UN 2693, Class 8 corrosive solution.
Black Powder Compressed: UN 0028, Class 1.1D explosive substance.
Black Powder Granular: UN 0027, Class 1.1D explosive substance for blasting or pyrotechnic use.
Blasting Agent: Explosive material designed for blasting, with UN numbers across Division 1.1D to 1.5D.
Boiling Point: Temperature at which liquid boils at standard pressure, relevant to portable tank instruction selection.
Bolster: Container support structure on flat racks that must accommodate proper IMDG securing of dangerous goods.
Bomb Smoke Non Explosive: UN 2028, Class 8 corrosive solid, despite the word bomb.
Booster Without Detonator: UN 0042, Class 1.1D explosive used to increase detonation.
Bottle Pressurized: Generic shipping term for IMDG pressure receptacles per ISO 11118 or UN cylinders.
Bowsprit Marking: Not applicable to IMDG, included only to caution against confusion with maritime forward markings.
Box: Terminal shorthand for an intermodal freight container, regardless of length or type.
Bromine: UN 1744, Class 8 with Class 6.1 subsidiary risk, Packing Group I, highly corrosive.
Bromine Chloride: UN 2901, Class 2.3 toxic gas with Class 8 and 5.1 subsidiary risks.
Bromine Trifluoride: UN 1746, Class 5.1 with Class 6.1 and 8 subsidiary risks.
Bromoacetic Acid Solid: UN 3425, Class 8 corrosive solid Packing Group II.
Bulk Cargo: Loose cargo subject to IMSBC Code; not normally lashed but governed by trimming and stability.
Bulk Container: IBC, freight container or portable tank used for dangerous goods in bulk, with IMDG types BK1, BK2, BK3 for solids.
Bulkhead: Vertical partition dividing a ship into compartments.
Burst Pressure: Pressure at which a pressure receptacle fails, IMDG requires minimum margin above test pressure.
Butadienes Stabilized: UN 1010, Class 2.1 flammable gas, often in pressurized tank containers.
Butane: LPG component; carried fully pressurized, semi-refrigerated, or fully refrigerated.
Butanol: UN 1120, Class 3 flammable liquid Packing Group II or III depending on isomer.
Butyl Acetate: UN 1123, Class 3 flammable liquid Packing Group II or III.
Butyl Acrylate Stabilized: UN 2348, Class 3 flammable liquid Packing Group III.
Butylene: UN 1012, Class 2.1 flammable gas.
Butyric Acid: UN 2820, Class 8 corrosive liquid Packing Group III.

C

Cadmium Compounds NOS: UN 2570, Class 6.1 toxic substance.
Caesium Hydroxide Solid: UN 2682, Class 8 corrosive solid.
Calcium Carbide: UN 1402, Class 4.3 dangerous when wet, liberates acetylene with water.
Calcium Cyanide: UN 1575, Class 6.1 toxic solid Packing Group I.
Calcium Hydride: UN 1404, Class 4.3 with Packing Group I.
Calcium Hypochlorite Dry: UN 1748, Class 5.1 oxidizer regulated with strict thermal stowage.
Calcium Hypochlorite Hydrated: UN 2880, Class 5.1 oxidizer with water content per IMDG entries.
Calcium Oxide: UN 1910, generally not regulated unless meeting hazardous criteria; check current Dangerous Goods List.
Calcium Phosphide: UN 1360, Class 4.3 with Class 6.1 subsidiary risk.
Camphor Synthetic: UN 2717, Class 4.1 flammable solid.
Capacity: Internal volume of a receptacle, limited for LQ and EQ shipments and key to portable tank suitability.
Capsule: Small Class 1 article such as a primer cap, UN 0044 for primers cap type.
Carbamate Pesticide Solid Toxic: UN 2757, Class 6.1 entry covering a chemical family.
Carbon Dioxide Refrigerated Liquid: UN 2187, Class 2.2 cryogenic gas.
Carbon Dioxide Solid Dry Ice: UN 1845, Class 9 not regulated by IMDG when used for cooling unless certain conditions, see special provisions.
Carbon Disulfide: UN 1131, Class 3 flammable liquid with Class 6.1 subsidiary risk, very low flash point.
Carbon Monoxide Compressed: UN 1016, Class 2.3 with Class 2.1 subsidiary risk.
Carbon Tetrachloride: UN 1846, Class 6.1 toxic liquid Packing Group II.
Carcinogen: Substance that may cause cancer, considered in IMDG chronic toxicity classification under Class 6.1 and Class 9.
Cargo Declaration: Vessel level declaration of dangerous goods to port state under SOLAS VII regulation 6.
Cargo Information: Shipper-declared particulars required under SOLAS VI/2.
Cargo Ship: Vessel other than passenger ship, with different IMDG stowage allowances per stowage category.
Cargo Tank: Permanent or portable tank installed for the carriage of liquids in bulk, regulated under IMDG when carrying packaged tank containers.
Cargo Transport Unit: CTU, defined under IMDG and the CTU Code as a freight container, swap body, vehicle, railway wagon or portable tank.
Carriage Forbidden: Status of certain entries that may not be moved under IMDG, marked accordingly in special provisions.
Carrier: Party that performs or undertakes carriage of goods under a bill of lading.
CAS number: Chemical Abstracts Service identifier used on MSDS for marine fuels and additives.
Castor Beans: UN 2969, Class 9 miscellaneous dangerous good due to ricin toxin.
Category I White: Class 7 radioactive package label indicating transport index 0 and surface radiation level not exceeding 0.005 mSv/h.
Category II Yellow: Class 7 label indicating transport index up to 1 and surface dose rate up to 0.5 mSv/h.
Category III Yellow: Class 7 label indicating transport index up to 10 and surface dose rate up to 2 mSv/h.
Cellulose Nitrate: UN entries 2059, 2555, 2556, 2557 depending on form, Class 4.1 self reactive.
Centistokes: Unit of kinematic viscosity referenced in some IMDG entries for viscous flammable liquids.
Cerium Slabs Ingots or Rods: UN 1333, Class 4.1 flammable solid.
Certificate of Approval: Document issued by competent authority for portable tanks, MEGCs and certain Class 1 packagings.
CFR: Cost and Freight, Incoterm 2020.
Chemical Compatibility: Property checked under IMDG 4.1.1.2 to ensure inner packaging materials do not react with contents.
Chemical Oxygen Generator: UN 3356, Class 5.1 oxidizer with stringent forbidden carriage rules in some passenger contexts.
Chemical Under Pressure: UN 3500 series, regulated under IMDG with specific PSN such as flammable, toxic or corrosive.
Chloric Acid Aqueous Solution: UN 2626, Class 5.1 oxidizer with concentration limits.
Chlorine: UN 1017, Class 2.3 toxic gas with Class 8 subsidiary risk, segregation from ammonia mandatory.
Chlorine Dioxide Hydrate Frozen: UN 9191, special UN number historically in IMDG with restrictive provisions.
Chlorine Trifluoride: UN 1749, Class 2.3 with Class 5.1 and 8 subsidiary risks.
Chloroform: UN 1888, Class 6.1 toxic liquid Packing Group III.
Chloropicrin: UN 1580, Class 6.1 toxic liquid Packing Group I.
Chloropicrin Mixtures NOS: UN 1583, Class 6.1, classification depends on composition.
Chromic Acid Solid: UN 1463, Class 5.1 with Class 8 and 6.1 subsidiary risks.
Chronic Toxicity: Long term toxicity considered in Class 9 EHS classification using GHS chronic aquatic toxicity criteria.
Class 1 Magazine: Dedicated stowage compartment for Class 1 explosives, designed to limit propagation between divisions.
Class 1.1: Substances and articles with mass explosion hazard.
Class 1.2: Substances and articles with projection hazard but not mass explosion hazard.
Class 1.3: Substances and articles with fire hazard and minor blast or projection hazard.
Class 1.4: Substances and articles presenting no significant hazard, with effects largely confined to the package.
Class 1.5: Very insensitive substances with mass explosion hazard.
Class 1.6: Extremely insensitive articles with no mass explosion hazard.
Class 2.1: Flammable gases such as UN 1978 propane.
Class 2.2: Non flammable non toxic gases such as UN 1066 nitrogen compressed.
Class 2.3: Toxic gases such as UN 1017 chlorine.
Class 3: Flammable liquids with flash point at or below 60 degrees Celsius closed cup, or carried at or above flash point.
Class 4.1: Flammable solids, self reactive substances, polymerizing substances and solid desensitized explosives.
Class 4.2: Substances liable to spontaneous combustion.
Class 4.3: Substances which in contact with water emit flammable gases.
Class 5.1: Oxidizing substances.
Class 5.2: Organic peroxides, with sub classification by type A to G.
Class 6.1: Toxic substances classified by oral, dermal or inhalation LD50/LC50.
Class 6.2: Infectious substances classified into Category A UN 2814 or 2900 and Category B UN 3373.
Class 7: Radioactive material classified by activity, fissile content and surface dose rate.
Class 8: Corrosive substances classified by destruction of skin or steel and aluminium corrosion rate.
Class 9: Miscellaneous dangerous substances including marine pollutants, EHS, lithium batteries, dry ice and elevated temperature substances.
Class Label: Square on point diamond 100 mm by 100 mm package label depicting class symbol and number.
Classification: Process under IMDG Part 2 of assigning UN number, PSN, class, subsidiary risk, packing group and segregation group.
Closed Cup Flash Point: Flash point measured in a closed test cup per ISO 13736 or ASTM D93, used for Class 3 PG assignment.
Closure: Component closing the opening of a packaging, critical to IMDG packaging integrity tests.
CMA CGM: French container shipping line, third-largest globally.
CMI: Comite Maritime International, NGO contributor to maritime-law unification.
Coastal Voyage: Domestic short sea voyage where some flag states permit relaxations of IMDG via national regulation.
Cobalt Naphthenates Powder: UN 2001, Class 4.1 flammable solid.
Code of Safe Practice for Cargo Stowage and Securing: CSS Code, complements IMDG for securing of CTUs and packaged dangerous goods on deck.
Cohesive Strength: Property of bulk solids relevant where IMDG and IMSBC overlap for substances declared dangerous in bulk.
Combination Packaging: Packaging composed of one or more inner packagings secured in an outer packaging, IMDG code combinations such as 4G/Y15/S.
Combustibility: Property assessed in IMDG 2.4 burn rate test to assign Class 4.1 packing groups.
Combustible Liquid: National regulatory term in the United States for liquids with flash point above 60 degrees Celsius, generally not Class 3 under IMDG.
Combustion Products: Substances generated during fire of dangerous goods, addressed in EmS fire schedules.
Commodity List: Internal terminal listing of accepted IMDG UN numbers and quantities, used for berth and storage planning.
Compatibility Group: For Class 1 explosives, letters A to S indicating which articles or substances may be stowed together.
Competent Authority: Government authority designated under HKC or Basel Convention to administer recycling rules.
Composite Packaging: Packaging consisting of an outer packaging and an inner receptacle that act as an integral unit, codes 6HA1, 6HG2, etc.
Composite Pressure Receptacle: Cylinder with metal liner reinforced with composite material, designed per ISO standards referenced in IMDG 6.2.
Compressed Gas: Gas which when packaged under pressure is entirely gaseous at minus 50 degrees Celsius.
Concentration: Mass or volume fraction of active substance critical to assignment of correct UN entry and packing group.
Confined Space: Space with limited access where dangerous goods may accumulate hazardous atmospheres, addressed in EmS spill schedules.
Conflagration: Mass burning event, the controlling hazard for Class 1.3.
Consignee: Party to whom goods are consigned.
Consignment: One or more packages of dangerous goods presented by a consignor for transport.
Consignor: Shipper named in the bill of lading.
Constant Wattage Heater: Heating system used on tank containers transporting solidifying cargoes that fall under IMDG elevated temperature provisions.
Container: ISO 668-defined intermodal freight unit.
Container Packing Certificate: CPC, declaration signed by the person responsible for packing a container that IMDG packing requirements are met.
Containment System: Total assembly of receptacles and packaging components that retain dangerous goods, central to IMDG Part 6 testing.
Contamination: Presence of soluble salts, oil, dust, or other deleterious matter on a substrate prior to coating.
Continuous Examination Program: ACEP scheme accepted under CSC for IMDG containers in lieu of periodic examination.
Contributory Hazard: Synonym for subsidiary risk, the secondary hazard class shown in parentheses on the DG declaration.
Convection Drying: Cargo conditioning process unrelated directly to IMDG but may affect moisture content of self heating Class 4.2 substances.
Conversion Factor: Multiplier used to convert mass to volume or activity to transport index in Class 7 calculations.
Cooling Time: Period required to dissipate heat from a self reactive Class 4.1 or organic peroxide Class 5.2 cargo, basis for SADT determination.
Copper Acetoarsenite: UN 1585, Class 6.1 toxic solid.
Copper Based Pesticide Solid Toxic: UN 3010, Class 6.1 toxic liquid pesticide entry.
Corrosion Rate: Penetration rate on steel or aluminium surfaces used to assign packing groups in Class 8.
Corrosive: Class 8 hazard label depicting droplets attacking hand and metal.
Cotton Wet: UN 1365, Class 4.2 spontaneously combustible substance when sufficient moisture content.
CPC: Container Packing Certificate, see entry under that term.
Cresols: UN 2076, Class 6.1 with Class 8 subsidiary risk.
Crocidolite: UN 2212, regulated as asbestos amphibole under Class 9.
Crude Oil: Annex I cargo; varies by API, sulfur, H2S, pour point.
Cryogenic Liquid: Refrigerated liquefied gas at very low temperature, often Class 2.2 with portable tank instruction T75.
CSC: International Convention for Safe Containers, 1972, governing structural safety of freight containers.
CSC Safety Approval Plate: Plate attached to every CSC container, prerequisite for offering dangerous goods in that unit.
CTU Code: IMO/ILO/UNECE Code of Practice for Packing of Cargo Transport Units.
Cumene: UN 1918, Class 3 flammable liquid Packing Group III.
Cumulative Quantity: Sum of LQ or EQ packages allowed per consignment under IMDG 3.4 and 3.5.
Curie: Historical unit of radioactivity, 3.7 by ten to the tenth becquerel, replaced by becquerel in IMDG.
Cyanides Inorganic Solid NOS: UN 1588, Class 6.1.
Cyclohexane: UN 1145, Class 3 flammable liquid Packing Group II.
Cyclohexanone: UN 1915, Class 3 flammable liquid Packing Group III.
Cyclonite Wetted: UN 0072 or UN 0391 depending on wetting agent, Class 1.1D explosive substance.
Cyclotetramethylene Tetranitramine Wetted: HMX wetted, UN 0226 or 0391, Class 1.1D.
Cylinder: Transportable pressure receptacle with water capacity not exceeding 150 liters, IMDG 6.2 compliant.

D

Damaged Cells: Lithium battery condition requiring special UN 3171 or 3536 carriage or, where prohibited, no transport.
Damaged Lithium Battery: Transport conditions defined under SP188 and SP310 are not applicable; defective or damaged batteries follow SP376 and may be forbidden.
Danger Label: Generic term for IMDG class label or subsidiary risk label affixed to packages.
Dangerous Goods: Substances and articles meeting any IMDG classification criteria across Classes 1 to 9.
Dangerous goods declaration: DGD, shipper declaration under IMDG Code.
Dangerous Goods List: DGL, the table in IMDG Part 3 Chapter 3.2 listing every UN number with classification, packing and stowage data.
Dangerous Goods Manifest: Required under SOLAS VII/4.
Dangerous Goods Note: Industry shipping note used by some forwarders as a precursor to or alongside the DG declaration.
Dangerous Goods Safety Adviser: DGSA, person required under European ADR and recommended for some IMDG operations to oversee compliance.
Dangerous When Wet: Class 4.3 hazard label depicting flame on a blue background with a W or appropriate symbol.
Deck cargo: Cargo carried on the weather deck.
Decomposition: Chemical breakdown that for Class 5.2 peroxides drives the SADT used for stowage temperature controls.
Decompression Sickness: Diving condition unrelated to IMDG, listed only to flag MFAG coverage of compressed gas exposures.
Deflagration: Subsonic combustion wave; relevant to dust and vapor explosions.
Density: cargo mass per unit volume, governs stowage factor.