HEGA is the carbon cloth filter developed by the British military against chemical warfare. In order for a material to have the designation HEGA, an absorber must perform at a minimum efficiency of 99.9% when tested in accord with the Institute of Environmental Sciences designation: IES-RP-CC-008-84, Recommended Practice for Gas Phase Adsorber Cell.
It is a carbon cloth filter which is proven to be much more effective at removing gases from the atmosphere than the granular activated carbon form of absorber. Due to HEGA style filter's light weight and easy implementation it is used in air purifiers for the general public today. All HEGA style filter units must be packaged, designed, built and filled in accord with the Environmental Science Recommendations, to fit the primary purpose of use. This means that in many cases they are not interchangeable.
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