3M™ High Fluid Resistant Procedure Mask with Face Shield 1840FS - Available with or without a face shield, these high fluid resistant earloop procedure masks pass ASTM's highest level of protection (160 mm Hg). Appropriate for procedures where there is concern about potential exposure to blood and body fluids. Note: High fluid resistant masks pass ASTM highest level of 160mm Hg for fluid and splash resistance. Level 3 fluid resistance. Pass ASTM's highest level of protection (160 mmHg) - Lightweight - Comfortable and easy to breath through.