S2 Filters have been independently tested by SGS Labs. 

S2 Filters achieve 99.99% filtration of all particles larger than 6 microns. This is a higher filtration standard than FFP3/N99.

Disposable 5-ply non-woven material made from certified GB2626-2006 material.

Particle Filtration Efficiency >99%.

Produced in ISO 9001:2015 facility.

S2™ Mask filter was tested according to EN149:2001 A1:2009 standards at SGS Labs in August 2020.

The test results show that the S2™ Mask filter, effectively filters 99.67% of particle matter.

MoD products are tested as PPE according to EN 149:2001+A1:2009 in class FFP3 and fully correspond to the indications of the World Health Organization (WHO) - Infection prevention and control guidance.

When should I change my S2 Filters?

When you should change your S2 filters is different for everyone. It depends factors such as where you use your S2 Mask, your health, the health of those you interact with, the duration of use, and personal preference.

We like to use this example. If you travel on a plane, or on a subway, change the filter every journey. If you only wear the mask twice per week to go to the local shops, you will be fine for a week or two. It's all about exposure.

High exposure to people = frequent filter changes.
Low exposure = less frequent filter changes.