IMDG class 3 covers flammable liquids and class 8 covers corrosive substances. Both ship regularly from India in drums, IBCs and ISO tanks, but both need UN-approved packaging, correct labels and attention to segregation. The details sit in the IMDG Code, which is updated every two years.
Typical class 3 goods include solvents and some formulated products. Typical class 8 goods include acids, caustic soda and many cleaning chemicals. Many products carry a subsidiary risk, for example a corrosive that is also flammable, and the label must show both.
What counts as class 3 and class 8?
Class 3 liquids have a flash point of not more than 60 degrees Celsius in the closed-cup test, and are sorted into packing groups by flash point and boiling point. Class 8 substances are grouped by how quickly they damage skin or attack metals, and the packing group sets the strength of packaging needed.
The SDS gives the UN number, class and packing group in section 14. Check they agree with the label, and see IMDG classes for the full list. Whether caustic soda needs the full DG treatment depends on form, as covered in is caustic soda dangerous cargo.
What packing does each class need?
Both classes need UN-marked packaging suited to the packing group, with markings that match the cargo and the testing level. Corrosives need materials that will not be attacked, such as plastic drums for acids or compatible steel for certain alkalis. Flammable liquids need closures that stay tight and containers that do not build static charge.
Reused drums and IBCs must still carry valid UN marks and inspection dates. See UN-approved packaging for hazardous chemicals for how to read the marks.
How are class 3 and class 8 segregated?
The IMDG segregation table sets which classes may share a container, a hold or a deck. Acids and alkalis, both in class 8, must be kept apart, and flammable liquids must be kept away from oxidisers and from heat sources. Most lines will not mix incompatible classes in one container, and many insist on below-deck stowage for flammables.
That is why one full container of a single product is usually the simplest and safest booking. Mixed loads need a segregation check by the forwarder before you pay for packing.
What about surcharges and documents?
Lines usually charge a dangerous goods surcharge, and the amount depends on the class, the route and the line. We do not quote figures; ask your forwarder to list every DG-related charge in the quote. Why DG freight costs more explains the drivers.
The dangerous goods declaration must show the same details as the label, and the factory should supply it before cut-off. Who signs the DG declaration is worth reading before the first booking.
How we help
We check classification, labels and packaging at the plant and supervise loading. For the booking sequence itself, see shipping dangerous goods from India. To plan a first class 3 or class 8 shipment, book a free sourcing review.