What type of surfaces are quaternary ammonium compounds (quats) designed to disinfect?

Quaternary ammonium compounds (quats) are specifically formulated to disinfect nonporous surfaces. These surfaces do not absorb moisture, making them ideal candidates for the action of quats, which work effectively to kill germs and bacteria on hard, nonabsorbent materials. Quats adhere well to these surfaces, leading to a higher effectiveness in disinfecting as they prevent the growth of bacteria while providing a residual antimicrobial effect.

Porous surfaces, on the other hand, are not suitable for quats because their absorbent nature allows moisture and bacteria to penetrate, which can reduce the effectiveness of the disinfectant. Similarly, the statement about quats working on all types of surfaces is misleading because their efficacy diminishes on porous materials. The focus on nonporous surfaces makes quaternary ammonium compounds particularly valuable in environments like salons and barbershops, where tools and chairs need to be kept sanitary and free from contaminants. The assertion that quats are designed solely for metal surfaces is overly restrictive, as they can be used on various nonporous materials, including plastics and glass, not just metals.