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Old 05-11-2010, 05:55 PM
oldred oldred is offline
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Iso's don't just "go right through" an activated carbon filter if it is is still fresh and not saturated but the filters do not stop 100% of the fumes either. That chart I mentioned earlier showed declining protection from various contaminates and after a given amount of time depending on the contaminate and the concentration the permissible exposure limit could be exceeded before the filter reaches total saturation. With iso's fresh filters can provide adequate protection within permissible limits for an hour or so or for several hours depending on the concentration. The fact that there are a lot of painters out there who have been using these things for years with no apparent ill effects is testament to the fact that they do provide protection within a reasonable range. I would never recommend to anyone to use these things for total protection for continuous everyday use or in really heavily contaminated areas but for occasional use to simi pro use in a reasonably ventilated area they will provide adequate protection if they are fresh and used PROPERLY!
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