Dangerous Goods Class 3 | Flammable Liquids

Dangerous Goods Class 3 | Flammable Liquids

hazmat class 3

International Hazmat Shipping is not that easy process, to ship class 3 dangerous goods by air you need to use hazmat shipping companies to help you.  To ship paints -UN 1263- you need to ask your self " are there shipping companies near me, or air freight forwarders,  if so, do they hold hazmat shipping certification?

If you answer this question, you are aware of the potential danger associated with transporting dangerous goods by air. Hazmat handling training is mandatory for parties participating in the handling of hazmat packages through the air freight supply chain. 

In this article, I will explain hazmat class 3, which is flammable liquids and you will be able to identify  class 3 dangerous goods labels and how to assign packing groups for hazardous materials class 3.

Class 3  Dangerous Goods | Flammable Liquids

DG Class 3 Definition :

 Class 3 dangerous goods include the following substances :

1- Flammable liquids

2-Liquids desensitized explosives.

These liquids are explosive substances that are dissolved or suspended in water or other liquids substances to form a homogeneous liquid mixture to suppress their explosive properties. You may ask what kind of substances are those?

Well, I will give you one example:

UN 3064, Nitroglycerin solution in alcohol ( in certain concentration as stated in IATA DGR Book). Don't assume that air travel is not safe. It is safe, UN 3064 is not permitted to be carried on passenger aircraft, it is accepted for carriage on cargo aircraft only

* for dangerous goods freight forwarder refer to [ A188].

IATA  code - IMP

IATA Cargo Interline Message Procedure (IMP) codes to indicate the class/division of dangerous goods contained in the ULD, or in the aircraft cargo compartment ( bulky aircraft). 

Hazmat Class 3 flammable liquids have RFL IMP Code. 

R - Restricted 

F- Flammable

L- Liquids  

You got it, right. 

Dangerous Goods Placards  - Class 3

hazmat placard
DG Class 3  - Hazmat Placards

Packing Groups 1 2 3 - For Hazmat Class 3

Flammable liquids are assigned to the packing group - UN packing group -  according to a flashpoint and the boiling point of the liquid. UN packaging requirements are mandatory, for this reasons hazmat packages must undergo UN packaging testing before it is used for International Hazmat Shipping.  

This table is used to determine the packing group of a liquid that presents a hazard only due to flammability.  

Packing group


Flash point (closed-cup)


Initial boiling point




≤35 °C (95 °F)


<23 °C (73 °F)

>35 °C (95 °F)


≥23 °C but ≤60 °C

(≥73 °F, but ≤140 °F)

>35 °C (95 °F)

Packing Group I: High danger

Assigned to flammable liquids with an initial boiling point less than or equal to 35°C
Examples: UN 1302, Vinyl ethyl, stabilized, packing group 1. 

Packing Group II: Medium danger

Assigned to flammable liquids with a flashpoint less than 23°C and an initial boiling point of greater than 35°C.
Examples: kerosene oil is classified as Acetone oil, UN,1091, packing group II.

Packing Group III: Low danger

Assigned to flammable liquids with a flash point greater-than-or-equal-to 23°C but less-than-or-equal-to 60°C and an initial boiling point of greater than 35°C.
Examples: UN 1223, kerosene , packing group III.

Flammable liquids, class 3 dangerous goods storage must be organized by segregation of class 3 from DG class 5 , division 2 oxidizers.

Finally, see this video about DG class 3.

More Dangerous Goods Classes

   *For DG Class 1, DG Class 5 , a link is within the article paragraphs. 


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Maged Saeed AL-Hadabi

I’m Instructor / Maged Saeed Al-Hadabi. ​ Air Cargo / IATA Dangerous Goods Regulations / Safety Management System Senior Instructor, Auditor [ Yemen Airways] . Approved IATA DGR/ SMS Instructor by Yemen Civil Aviation Authority. We hope you find Aviation Professional website not only informative, but interesting and helpful as well. Leave your comment , thank you.

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