Apparently it's the elastic that holds the mask. It's like any product they deteriorate over time (light, humidity...). They have 5 years lifespan, those produced in March 2015 expire in March 2020
Apparently it's the elastic that holds the mask. It's like any product they deteriorate over time (light, humidity...). They have 5 years lifespan, those produced in March 2015 expire in March 2020
Well, makes sense to replace them from time to time - but not when there is high demand like now. Masks who might not work anymore are still better than having no masks at all.
Well, makes sense to replace them from time to time - but not when there is high demand like now. Masks who might not work anymore are still better than having no masks at all.
Well, makes sense to replace them from time to time - but not when there is high demand like now. Masks who might not work anymore are still better than having no masks at all.