Chemical Structure / July 20, 2018 / Isabelle Vinson
Benzoyl peroxide (BPO) is a medication and industrial chemical. As a medication it is used to treat mild to moderate acne. For more severe cases it may be used together with other treatments. Some versions come mixed with antibiotics such as clindamycin. Other uses include bleaching flour, hair bleaching, teeth whitening, and textile bleaching. It is also used in the plastic industry. Common side effects are skin irritation, dryness, or peeling. Use in pregnancy is of unclear safety. Benzoyl peroxide is in the peroxide family of chemicals. When used for acne it works by killing bacteria.
Paraformaldehyde (PFA) is the smallest polyoxymethylene, the polymerization product of formaldehyde with a typical degree of polymerization of 8–100 units. Paraformaldehyde commonly has a slight odor of formaldehyde due to decomposition. Paraformaldehyde is a poly-acetal. Paraformaldehyde forms slowly in aqueous formaldehyde solutions as a white precipitate, especially if stored in the cold. Formalin actually contains very little monomeric formaldehyde; most of it forms short chains of polyformaldehyde. A small amount of methanol is often added as a stabilizer to limit the extent of polymerization.
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