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CDL · Communication Rules

What does Hazard Class 8 represent?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

Corrosives (such as acids and strong bases that can damage skin, metal, and other materials)

  1. A Explosives
  2. B Corrosives (such as acids and strong bases that can damage skin, metal, and other materials)
  3. C Radioactive materials
  4. D Flammable gases

Why this is the answer

HAZARD CLASS 8 is CORROSIVES — materials (acids and strong bases/alkalis) that can DESTROY or DAMAGE living tissue (skin burns), metals, and other materials on contact. Examples: battery acid (sulfuric acid), hydrochloric acid, sodium hydroxide. CDL hazmat. Corrosives require careful handling (they can eat through containers and cause severe chemical burns); proper packaging and segregation are critical (some corrosives react dangerously with other materials). The corrosive placard is black and white. Knowing Hazard Class 8 = corrosives is part of understanding the hazard class system. Drivers must know the classes to recognize the hazards, ensure proper placarding, and respond appropriately in incidents. Knowing the hazard classes (Class 8 = corrosives) is commonly tested.
Source: FMCSA CDL Manual — Hazmat, Hazard Class 8

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About this topic: Communication Rules

Communication rules cover shipping papers, placards, labels and markings: what each must show, where papers must be kept in the cab, and when placards are required. This is the most heavily tested hazmat topic. This is one of 19 Hazardous Materials questions on communication rules, each with a full explanation on a single study page.

New to this exam? Our CDL exam guide explains the format, scoring, and how to prepare.

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