“ASTM Certification is given to products like face masks to determine the level of filtration effectiveness. Masks undergo extensive testing by a trusted third-party laboratory, and assigned standards recognized by federal health regulators where applicable.”
ASTM F2100 is the standard that covers the performance requirements and test methods for materials used to construct facemasks, and ASTM F2100 Level 3 face masks meet the highest performance requirements as defined by the bacterial filtration efficiency characteristic of greater than or equal to 98 percent.