Hazardous Materials (HazMat) Transport Practice Test 2026 - Free HazMat Practice Questions and Study Guide

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Class 8 HazMats are defined as corrosive substances that can cause skin destruction in ≤4 hours and corrosion of steel or aluminum at a rate of what?

1/4 inch per year

Corrosive materials are defined by their ability to destroy skin on contact and to corrode metal containers. For packaging made of steel or aluminum, the threshold used to classify a substance as corrosive is a corrosion rate of 1/4 inch per year. If a substance can corrode steel or aluminum at this rate or faster, it meets the definition of a corrosive hazardous material (Class 8). So the rate that defines the corrosion criterion is 1/4 inch per year.

1 inch per year

1/8 inch per year

1/2 inch per year