Leakage occurs around the edge of the mask when user inhales Leakage around the edge of the face covering when the user exhales is reduced as shown by an analysis of the product design. Reduces wearer’s exposure to particles including small particle aerosols and large droplets (only non-oil aerosols)įilters out at least 20% of airborne particles including large and small particlesĭoes NOT provide the wearer with a reliable level of protection from inhaling smaller airborne particles and is not considered respiratory protectionįilters out at least 95% of airborne particles including large and small particles Also provides a degree of particulate filtration to reduce the amount of inhaled particulate matterįluid resistant and provides the wearer protection against large droplets, splashes, or sprays of bodily or other hazardous fluids. Primarily provides source control to contain the wearer’s respiratory secretions and to potentially reduce exhaled particulates.
Although all of these masks are designed to cover both the mouth and nose, important differences between the mask types exist in terms of intended use, face seal fit, filtration, leakage, and reuse (see table below click on image or expand text box for details). The following table is adapted from the CDC’s comparison of medical masks and respirators and adds information about barrier face coverings that comply with ASTM F3502 to provide a quick comparison of the three types of masks addressed by standards in the US. However, not all masks are created equal. Part A: Different Masks for Different TasksĪccording to the CDC, masks can be used to protect yourself and to protect others. Note: Numbers in square brackets throughout the text refer to the ASTM F3502 section numbers being referenced. Appendix: A Deeper Dive into the Requirements for the Standards.Part C: What Does The Standard Mean for Mask Users, Makers, and Sewists.Three Design and Performance Criteria for ASTM F3502.Part A: Different Masks for Different Tasks.For home sewists and small manufacturers, the ASTM guidance can help clarify what types of testing to look for in our reading, and clarify testing goals for those headed to the lab.
These standards are not mandatory, but can help distinguish well-tested masks in the marketplace. This new standard establishes minimum requirements for design, performance, and testing that will allow users to compare mask options, and provides mask makers standards to strive for. Finally, the American Society for Testing and Materials (ASTM) has established a national standard for “Barrier Face Coverings” ( ASTM F3502) that are neither medical masks according to ASTM F2100 standards nor respirators according to NIOSH standards. Since February of 2020, we’ve been asking for standards for masks/face coverings used by our communities.
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