Odorless or mild odor monomer is primarily made up of which compound?

The correct answer is that odorless or mild odor monomer is primarily made up of ethyl methacrylate (EMA). This compound is known for its reduced volatility and lower odor compared to other monomers, especially compared to methyl methacrylate (MMA).

Ethyl methacrylate is a popular choice in the nail industry because it provides a good balance of performance while being more pleasant for both the technician and the client due to its milder scent. This characteristic makes EMA preferable in formulations aimed at minimizing strong odors, which can be uncomfortable in enclosed spaces like nail salons.

In contrast, compounds like methyl methacrylate (MMA) are associated with stronger odors and potential health risks; hence, they are often less favored in modern nail products. Polyethylene glycol and acetone serve different purposes in nail treatments; polyethylene glycol is typically used in various applications for its moisture-retaining properties, while acetone is primarily a solvent and not used as a monomer in acrylic systems.