One can buy a disposable product which appears identical to medical grade disposable surgical masks, but is not. The package or item description typically includes a clear indication that it is not medical grade.
These masks appear to be constructed in the same way and of the same materials as a medical mask (melt-blown middle layer).
What is it about these products that disqualifies them as medical grade?
Is that difference relevant to personal protection when selecting a mask for COVID-19 protection in non-medical everyday settings? Would it pertain to product performance? Are these products not sterilized? If not sterilized, is there any actual or potential health implication for the wearer?
Examples of the non-medical grade product available in local stores: