Do you know what precautions need to be taken when it comes to packaging dangerous goods for transport?

Dangerous goods transportation is a rather specialized form of shipping that requires dedicated organizational or technical expertise, involving the use of specialized vehicles to handle unconventional items. Strictly speaking, only entities that have undergone rigorous review and approval by relevant national authorities, successfully completed hazardous material packaging tests, and possess the necessary facilities and equipment to ensure the safe transport of dangerous goods are authorized to carry out such shipments. So, when it comes to transporting hazardous cargo, what are the common types of packaging used in hazardous material testing—and what key considerations should be kept in mind?

I. Classification of Packaging for the Transport of Dangerous Goods

The packaging of hazardous chemicals, in accordance with the testing standards for hazardous material packaging, is categorized into the following three classes based on the degree of hazard:

Class I Packaging : The goods pose a significant hazard, requiring high packaging strength.

Class II Packaging :The goods are moderately hazardous, requiring high packaging strength.

Class III Packaging :The goods pose a low level of hazard, and the packaging only requires standard strength.

II. Precautions for Packaging Dangerous Goods for Transport

1. One of the purposes of hazardous materials packaging testing is to ensure that the packaging is robust and intact, capable of withstanding normal impacts, vibrations, and pressures encountered during transportation, storage, and handling—and also easy to load, unload, and move.
2. For the filling of liquid hazardous goods, the packaging inspection process requires that containers have sufficient expansion space to accommodate high temperatures during normal transportation. Flammable liquid containers must maintain at least a 5% headspace.
3. And meanwhile In hazardous materials packaging testing, regarding The packaging cushioning material must not react with the intended contents, as such reactions could compromise safety. Instead, it should securely prevent the contents from shifting while providing shock absorption and impact protection.
4. The material, specifications, and structural design of packaging materials must be compatible with the nature and weight of the hazardous goods being packed—this is a critical consideration in hazardous material packaging testing. Additionally, the packaging container must not react dangerously with the intended contents, nor should it compromise the strength of the packaging itself.
5. Liquid hazardous goods must be sealed tightly at the liquid outlet; for substances that can generate harmful vapors or are prone to deliquescence, or that may react dangerously upon exposure to acid fumes, airtight sealing is required. For containers that necessarily have ventilation holes, their design and installation must prevent cargo from leaking out or allowing impurities or moisture to enter—and ensure that any gases released do not pose a hazard or cause contamination. All other hazardous goods must be packaged in a way that guarantees complete leak-proof sealing.
6. The packaging surface must be clean and free of any adhesion from the contents or other harmful substances.

3. Case Studies

For packaging toxic goods, clearly mark them with a prominent "Toxic" symbol. The primary measure to prevent poisoning is ensuring the packaging is tightly sealed, leak-proof, and airtight. Relevant standards for hazardous material packaging explicitly require, for instance, that potassium dichromate (red potassium chromate) and sodium dichromate—both appearing as red, transparent crystals—are highly toxic and must be securely packed in sturdy drums with tightly sealed lids. The thickness of the steel plates used to make these drums must not fall below 1.2 millimeters. As for organic pesticides and similar products, they should be placed inside asphalt-coated burlap sacks with seams carefully sealed to prevent leakage. If plastic or asphalt-lined paper bags are used for packaging, these should then be further encased in an outer layer of burlap or cloth bags to ensure maximum safety.

For corrosive goods, relevant standards for hazardous materials packaging also emphasize the need to prevent chemical reactions between the product and the material of the packaging container. For metal containers, it’s essential to apply a protective coating on the inner walls to shield them from corrosion caused by the corrosive contents. For instance, iron drums used for packaging synthetic fatty acids must have an acid-resistant lining inside to safeguard the drum from being eaten away by the product, which could otherwise lead to spoilage of the contents as well. Similarly, hydrofluoric acid is an extremely toxic, highly corrosive inorganic acid that can even etch glass. As a result, it cannot be stored in glass containers—instead, it should be transferred into either metal or plastic drums before being carefully packed into wooden crates. Another example: Formic acid is highly volatile, and its vapors are corrosive. To ensure safety, it must be stored in robust, acid-resistant jars, glass bottles, or plastic containers, sealed tightly to prevent leakage. Afterward, these containers should be securely placed inside sturdy wooden crates or metal drums for added protection.