These washable PTFE filters are able to block 99.9% of 0.1micron air particulates, achieving filtration efficiency which matches N99 and FFP3 standards.

Product Specifications

• 3-layer design: PTFE (polytetrafluoroethylene) film encased inside a non-woven polyester pocket for protection

• Official test reports show that PTFE filters block >99.9% of 0.1micron particulates, achieving same filtration efficiency as N99 and FFP3 standards.

• Highly breathable

• Hand washable up to 200 times (How to)

• More information

Certifications & Test Data

• Taiwan Textile Research Institute

Official Inspection test report (Report no. TFF9C342, April 2020)

Particulate filtration efficiency (PFE): 99.9% (tested with 0.075micron particulates)

Bacterial filtration efficiency (BFE): 99.9% (tested with Staphylococcus aureus)

Air exchange pressure: 4.3 mmH20/cm3

Mean inhalation resistance: 137.7 Pa

Mean exhalation resistance: 149.8 Pa