UK – BSI Publishes Guidance Document BSI Flex 5555 Version 2.1, April 2021 Community Face Covering – Specification

Vol. 1239 | April 23, 2021

The British Standards Institution (BSI) has published a third guidance document for community face coverings: BSI Flex 5555 Version 2.1, April 2021 Community Face Coverings — Specification. It is provided free of charge and is available to download via the link:

The guidelines have been produced to provide guidance on the minimum requirements for the design and performance assessment of community face coverings (barrier masks) which are intended for consumers. The specification is provided for community face coverings which are not intended to fall within the scope of PPE or medical face coverings.

It contains requirements to be applied to filtration efficiency and breathability and also contains details for:

  • General information on single- and multi-use face coverings.
  • Cleaning requirements for multi-use coverings.
  • Recommended test methods.

Version 2.1 is an update, focused on introducing changes to the filtration efficiency requirements and the material filtration efficiency test.

  • Bacterial Filtration efficiency (BFE) of 95% added to be line with EN 14683 type I masks.
  • Material filtration efficiency test particle size of 3.0 +/- 0.5 µm has been added.

BSI Flex 5555 Version 2.1, April 2021 Community Face Coverings — Specification is open for public comment. A further update of the specification will be published should it be required.

For additional information please contact:

Dave Smith, Global Softlines 
Office: +44 (0)1942 265700



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