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https://en.m.wikipedia.org/wiki/Surgical_mask
A surgical mask, also known as a face mask, is intended to be worn by health professionals during healthcare procedures.[1][2] It is designed to prevent infections in patients and treating personnel by catching bacteria shed in liquid droplets and aerosols from the wearer's mouth and nose
Surgical masks vary by quality and levels of protection. Despite their name, not all surgical masks are appropriate to be used during surgery. Surgical masks may be labeled as surgical, isolation, dental, or medical procedure masks.[9] Chinese health officials distinguish between medical (non-surgical) and surgical masks
只有中国医用跟非医用等级是中国政府避免质量混乱的要求,国外没有这个标准,只要三层,有熔喷布的都可以叫Surgical masks, 医用等级口罩有另有称呼,要加"medical grade"这个词
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