Question 133 of 180

Why can a single material sometimes present more than one type of hazard, requiring a primary and subsidiary hazard class designation?

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This designation applies only to Class 1 explosives
Some substances have properties spanning more than one hazard category, such as being both flammable and corrosive
Every hazardous material fits into exactly one hazard class with no overlap ever possible between categories at all
Subsidiary hazard classes are used only for shipping cost calculations

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Correct answer to question 133 (Hazardous Materials): Some substances have properties spanning more than one hazard category, such as being both flammable and corrosive

Why

Certain materials genuinely present more than one kind of danger, such as being flammable and also corrosive, so a primary hazard class along with a subsidiary designation captures both risks accurately.

Updated: November 2026

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Why can a single material sometimes present more than one type of hazard, requiring a primary and subsidiary hazard class designation?

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