Description 3 Ply Surgical Face Mask. Our ASTM Level 2 Surgical Face Mask is designed to resist moderate fluid splashes at 120mmHg while maintaining smooth breathability. The highly efficient filtration media can filter or trap all the common bacteria and particles surrounding us. The design of the surgical masks depends on the mode; usually the masks are three-ply (three layers). This three-ply material is made up of a melt-blown material placed between the non-woven fabric. The melt-blown material acts as the filter that stops microbes from entering or exiting the mask. Masks must be changed when they become wet with saliva or other bodily fluids, as they lose their protective properties. Surgical masks are not tested against specific microorganisms and do not prevent specific diseases. Never reuse, wash or disinfect surgical masks. Never share surgical masks with others. How to use Make sure there are no gaps between the mask and your face. Discard masks if wet or soiled. Do not wear one for more than 24 hours