Nano Filter Paper - sold in 5 yards. Width is about 9.5 inches (24 cm), thickness of 0.14mm . This nonwoven filter fabric is made of PET (Polyethylene Terephthalate)(99%), PESU (Polyarylethersulfone)(1%) . It has more than a 90% of filtration efficiency tested with NaCl aerosol at inhalation flow rates of 95 liters/min and the particle size was 0.6 micrometer. Cut this to size that fits your mask. Designed for one time use. Do not re-use. You can cut about 10 filters per yard. Make sure you clean surfaces and blades before cutting to maintain cleanliness of filter.
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