ASTM rated masks for the United States
For those located in the United States, an ASTM-rated mask is the best choice for protection. These masks are tested using the ASTM International test method who sets forth a preferred international standard for materials used in healthcare that covers testing and requirements for material performance. As recommended by the federal government (Federal Food & Drug Administration), the masks are tested in five key performance areas:
• Differential pressure
• Bacterial filtration efficiency
• Particulate filtration efficiency
• Fluid resistance
There are three levels of rating a mask can receive ranging from low (Level 1) to moderate (Level 2) to high (Level 3) protection.