Indicates when filter needs changing

The diversified technology company revealed its Organic Gas and Vapour End of Service Life Indicator Filters give respirator wearers a clear warning of when they need to change their filters and prevent hazardous exposure. 

Currently, some users change their filters only when they can detect contaminant odour, taste, or irritation inside the respirator, with the result that the harmful substance has already broken through. 

To combat this problem, 3M’s innovation has used the company’s End of Service Life Indicator (ESLI) technology. The ESLI is located inside the filter next to the activated carbon. As organic vapours travel through the filter, they are adsorbed into the ESLI.

As this happens, the indicator changes colour, visually marking the course of the organic vapours through the filter. Dependant on viewing angle, the user will see a red bar on a green background, or vice-versa. Once the bar reaches the end-of-service line, the filter will need replacing. 

The ESLI can be used as either a primary or secondary method of determining a filter change out schedule, depending upon the specific hazard and exposure level. It also enables health and safety managers to audit filter status in real-time for each individual user. 

The products are compatible with all 3M half and full-face masks, so they can be used in a wide variety of applications and industries.