Pennsylvania Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

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What chemical product is commonly used for hair relaxing?

Ammonium thioglycolate

Sodium hydroxide

The commonly used chemical product for hair relaxing is sodium hydroxide. This strong alkali serves as an effective relaxer by breaking the disulfide bonds in the hair’s protein structure, allowing those bonds to be rearranged. This chemical process results in a straightened appearance, making it suitable for clients seeking to manage curly or frizzy hair.

While ammonium thioglycolate is another chemical that can be used for hair processing, it typically serves as the active ingredient in perm solutions rather than a relaxer. Calcium hydroxide is also used in some chemical treatments, but its primary application is in combination with other chemicals rather than as a standalone relaxing agent. Potassium bromate is primarily used in baking and has no application in hair relaxing treatments. Therefore, sodium hydroxide stands out as the recognized and effective chemical for achieving hair relaxation.

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Calcium hydroxide

Potassium bromate

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