Understanding DOT Class 8 Materials: Corrosive Materials

Definition of DOT Class 8: Corrosive Materials

Class 8 covers corrosive materials.

The formal definitions associated with Class 8 can be found in 49 CFR 173.136.

Class 8 Corrosives covers both materials that are corrosive to human skin and materials that are corrosive to metal. The hazard of being corrosive to human skin is the primary basis the regulation is written on and is referred to the most within the relevant regulations, due to the risk to human health presented.

Class 8 Packing Groups

Class 8 is divided into three Packing Groups, labeled Packing Group I, Packing Group II, and Packing Group III in descending order of severity. The primary assignment of the Packing Group is based on how rapidly the material can cause irreversible damage to human skin.

Lower Packing Group materials, meaning more dangerous materials, will have accordingly stricter packaging requirements and restrictions associated with them.

Relationship Between Class 8 and OSHA Hazard Classifications

Materials that are Skin Corrosive are considered a Health Hazard under OSHA's hazard classification. This classification is divided into Category 1 and Category 2, in descending order of severity. Category 1 is further subdivided into 1A, 1B, and 1C.

Materials that are Corrosive to Metal are considered a Physical Hazard under OSHA's hazard classification. This classification uses the same requirements as the DOT classification.