Solvents are some of the cheapest items on a laboratory order and some of the most awkward to ship. Almost every common organic solvent is a Class 3 flammable liquid under the UN transport regulations. That classification affects which transport mode you can use, how much can go in one package, how long the shipment takes and what it costs.
This guide compares the three routes buyers usually consider and explains the factors that decide between them.
A quick refresher on how solvents are classified
For transport, flammable liquids are assigned to Class 3 and to a packing group that reflects how easily they ignite. Packing Group I is the most hazardous, Packing Group III the least. Most common laboratory solvents, including acetone (UN1090), methanol (UN1230), acetonitrile (UN1648), ethanol (UN1170) and hexane (UN1208), fall into Packing Group II.
Some solvents also carry a subsidiary hazard. Methanol, for example, is Class 3 with a toxic subsidiary risk, which tightens air transport limits compared with acetone or acetonitrile.
Option 1: air cargo
Air cargo is fast, typically a few days door to door once documents are in order, and suits urgent or medium quantities. It is governed by the IATA Dangerous Goods Regulations, which set strict quantity limits per package.
- Passenger aircraft allow only small quantities of flammable liquids per package. For many Packing Group II solvents the limit is 5 litres, and for methanol it is lower because of the toxic subsidiary hazard.
- Cargo aircraft only routes allow larger packages, commonly up to 60 litres for Packing Group II flammable liquids, but fewer routes and airlines offer them.
- Packaging must be UN specification combination packaging, with absorbent material and correct marks and labels.
- A shipper's declaration for dangerous goods must be prepared by trained staff.
Always confirm current limits in the edition of the IATA regulations in force and with the airline, because operator variations can be stricter than the general rules.
From India, Zemixal moves air cargo through Mumbai (BOM) and Ahmedabad (AMD). Air is the usual choice for HPLC solvents needed for a validation run, small pilot quantities or replacement stock after an unexpected shortfall.
Option 2: sea freight
Sea freight under the IMDG Code is the economical route for drums, IBCs and full or part container loads. Quantity limits per package are far more generous, and the cost per litre falls sharply with volume.
- Transit times are measured in weeks rather than days, and depend heavily on the destination port and transhipment.
- Dangerous goods containers must be declared, placarded and stowed according to segregation rules. Not every vessel or port accepts every class on every sailing, which can add waiting time.
- Consolidated LCL shipments of dangerous goods are possible but harder to arrange than general cargo, and some consolidators refuse them.
Zemixal ships sea freight from Nhava Sheva (JNPT) and Mundra. Sea is best for planned, recurring volumes such as monthly drum supply of a process solvent.
Option 3: express courier
Express couriers are attractive for small packs because they handle customs clearance and deliver to the door. However, they accept dangerous goods only under specific contracts, on specific lanes and in limited quantities.
- Excepted quantities allow tiny amounts, for Packing Group II flammable liquids typically 30 mL per inner container and 500 mL per outer package, with minimal paperwork. This suits reference solutions and standards dissolved in solvent.
- Limited quantities allow somewhat larger inner packs, but courier acceptance varies by country and service.
- Full dangerous goods courier service exists on some lanes and costs considerably more than standard express.
A note on non-flammable alternatives: water, many aqueous buffers and some high flashpoint solvents are not regulated as flammable liquids. Where a method allows a choice, the non-regulated option can simplify shipping considerably, especially for small labs ordering by courier.
How to decide
- Start with volume. Under a few litres in small bottles, courier or air is realistic. A few hundred litres usually points to air cargo or sea, depending on urgency. Drums by the pallet almost always go by sea.
- Then urgency. If a production line or validation depends on it, the extra cost of air is often justified.
- Then destination. Some countries and airports have limited dangerous goods handling, and some couriers do not offer DG service to every postcode.
- Then the total landed cost, including dangerous goods surcharges, documentation fees, special packaging and local delivery, not just freight per kilogram.
Documents that travel with the shipment
Whatever the mode, a solvent shipment needs a consistent set of documents. The safety data sheet must show the correct UN number, proper shipping name, class and packing group in section 14. The commercial invoice and packing list should use the same description. For air, a shipper's declaration for dangerous goods is required, and for sea, a dangerous goods declaration and container packing certificate. Inconsistencies between these documents are one of the most common causes of shipments being held.
Ways to make solvent shipments easier
- Combine with non-hazardous items carefully. Mixed consignments can work, but the whole shipment then follows dangerous goods procedures. Sometimes splitting is cheaper.
- Choose pack size wisely. Four 2.5 litre bottles may be accepted where a single 10 litre container would not.
- Order earlier and go by sea for predictable consumption. Air should be the exception for routine solvent supply.
- Check local storage before a large delivery arrives. Flammable liquid storage limits in your building may be stricter than the shipment size.
Destination-specific notes on documents and transit are on the ship to pages, and you can browse solvent grades in the Solvents (HPLC and GC) division. When you request a quote, state your preferred mode and deadline on the RFQ form, and Zemixal will advise whether it is workable for the quantity and destination.