Dangerous Goods Classification Under SANS 10228: A Practical Guide for Transport Operators

Every consignment of dangerous goods moving on South African roads, rail, or through ports begins with a single critical step: correct classification. Get it wrong and the consequences cascade — rejected shipments, regulatory fines, insurance voidance, and in the worst cases, catastrophic incidents that endanger lives. SANS 10228, the South African standard for the identification and classification of dangerous goods, provides the framework. But applying it correctly demands more than a passing familiarity with hazard classes. It demands rigour.

Understanding the Structure of SANS 10228

SANS 10228 mirrors the United Nations Recommendations on the Transport of Dangerous Goods (the "Orange Book") and aligns closely with the UN Model Regulations. It organises dangerous goods into nine primary classes based on the dominant hazard they present: explosives (Class 1), gases (Class 2), flammable liquids (Class 3), flammable solids (Class 4), oxidising substances and organic peroxides (Class 5), toxic and infectious substances (Class 6), radioactive material (Class 7), corrosives (Class 8), and miscellaneous dangerous goods (Class 9). Several of these classes are further divided into divisions — Class 2, for instance, distinguishes between flammable gases (2.1), non-flammable non-toxic gases (2.2), and toxic gases (2.3).

Classification is not a matter of intuition or product familiarity. It is determined by the physical, chemical, and toxicological properties of the substance or article, tested and evaluated against the criteria set out in the standard and the associated UN test methods.

Assigning the Correct UN Number

Each dangerous good is assigned a four-digit United Nations number (UN number) that identifies it internationally. SANS 10228 incorporates the UN Dangerous Goods List, which maps specific substances to their UN numbers, hazard classes, subsidiary risks, and packing groups.

For pure substances and well-known preparations, UN number assignment is straightforward — sulphuric acid is UN 1830, acetone is UN 1090. The complexity arises with mixtures, solutions, and "not otherwise specified" (N.O.S.) entries. A mixture of flammable liquids that does not appear by name in the Dangerous Goods List must be classified based on its flash point, boiling point, and other properties, then assigned the most appropriate generic or N.O.S. UN number (such as UN 1993, Flammable liquid, N.O.S.). When using an N.O.S. entry, the technical name of the most hazardous component must appear in parentheses on shipping documents and packaging — a requirement frequently overlooked.

Packing Group Assignment

Packing groups indicate the degree of danger within a hazard class. Packing Group I represents great danger, Packing Group II represents medium danger, and Packing Group III represents minor danger. Not all classes use packing groups — gases (Class 2), infectious substances (Division 6.2), and radioactive materials (Class 7) do not.

For flammable liquids, packing group assignment depends on flash point and initial boiling point. For corrosives, it depends on the rate at which the substance destroys skin tissue and its corrosion rate on steel or aluminium surfaces. Misassigning a packing group has direct consequences for the type of packaging required, the quantity limits per transport unit, and the placarding and documentation obligations. A substance wrongly placed in Packing Group III instead of Packing Group II may be packed in lighter containers that cannot withstand the actual hazard.

Common Misclassifications and Their Consequences

Certain errors recur with troubling regularity among South African transport operators and consignors:

Classifying by product name rather than properties. A "cleaning solution" may sound benign, but if it contains a significant concentration of sodium hydroxide, it is a Class 8 corrosive. Classification must follow the substance's characteristics, not its commercial description.

Ignoring subsidiary risks. A substance may be primarily a flammable liquid but also toxic. Failing to declare subsidiary hazards means emergency responders lack critical information during a spill or fire.

Defaulting to the lowest packing group. When test data is unavailable or ambiguous, some consignors default to Packing Group III to minimise packaging costs. This is both non-compliant and dangerous.

Misapplying the "limited quantities" exemption. Limited quantity provisions reduce regulatory burden for small inner packagings, but they do not eliminate classification obligations. The substance must still be correctly classified before the exemption can be applied.

The regulatory consequences under the National Road Traffic Act and its associated regulations include fines, vehicle impoundment, and criminal liability in the event of an incident. Insurers routinely deny claims where misclassification is established.

SADC Cross-Border Requirements

Dangerous goods moving across borders within the Southern African Development Community must comply with the requirements of each transit and destination country. While many SADC member states reference the UN Model Regulations, implementation varies. South African SANS 10228 classification is generally accepted, but transport documents must be in a language understood at each border post — typically English — and must include all required particulars: UN number, proper shipping name, hazard class, packing group, and emergency contact information. Some SADC corridors impose additional requirements for escort vehicles or restrict transit times through urban areas.

Getting Classification Right From the Start

Classification is not a one-time exercise. It must be reviewed whenever formulations change, new test data becomes available, or regulatory standards are updated. Maintaining accurate, up-to-date Safety Data Sheets and training personnel responsible for classification are non-negotiable operational requirements.