When there are more than one hazard classes for a product what must be indicated?

• A. The Secondary Hazard Class
• B. All Hazard Classes
• C. The Primary Hazard Class
• D. No hazard class

Answer: (C)

When a product has more than one hazard class, the main concern is the primary hazard—the most significant danger it presents. This primary hazard class is what must be indicated on the package and used to determine handling, packaging, and transport requirements. The secondary hazards, while noted in other ways (such as on the shipping document or, where required, as subsidiary risk labels), do not replace the primary designation. For example, a substance that is primarily flammable but also has a secondary toxic hazard will be labeled for the primary hazard (flammable) and the secondary hazard may be noted as subsidiary risk where regulations require, but the primary class is still the key indicator.