A medical surgical mask can be used for several hours.
Medical surgical masks are generally recommended for use up to four hours only. The detailed explanation is as follows:
Medical surgical masks are common protective devices, consisting of a mask body and straps. The mask body has a three-layer structure with special waterproof treatment, capable of storing electric charges to prevent static electricity, while the inner layer has good moisture absorption properties that can absorb moisture from exhaled air. Medical surgical masks have filtration capabilities that reduce the spread of microorganisms during exhalation and protect against external bacteria entering the body, providing bidirectional isolation and lowering the risk of transmission. During use, harmful substances in the air may adhere to the surface of the mask. Prolonged use may result in the mask becoming damp from ambient humidity or respiratory moisture, which could compromise its protective effectiveness. Therefore, the mask should be replaced promptly once it has been worn for more than four hours. Thus, medical surgical masks are typically used for four hours.
It is recommended to perform hand disinfection before putting on a mask to avoid contaminating it. The metal nose clip should fit snugly against the face. If the mask becomes damaged, it should be replaced immediately.