Posted By Simon Carrier Karel If the filters or the cloth contains carbon black, which it may well do, then some type of air monitoring should have taken place. Carbon black has an workplace exposure limit of 3.5 mgm3 and if this is exceeded extraction of ppe should be provided. Of course if carbon black is not being used then this post is a waste of time. I would ascertain what chemicals are being used and go from there. Hope this helps. regards

Posted By Robert K Lewis Having undertaken work with one of the manufacturers of these cloths they do not seem to have had any problems such as described. The alternative answer may be that your manufacturer is using a different surface dusting powder to prevent adhesion of the fabric. Bob

Posted By Mike Carbon cloth is made by pyrolising a polymeric textile like rayon. It won't contain any amorphous carbon like carbon black. The activation process which gives it its high surface area and filter properties seems to require the presence of metal chlorides. It might have been zinc chloride in cloth I was familiar with 30 years ago, but it's a long time since I used any. I think superheated steam and hydrogen chloride emission might be involved in the manufacturing process, but presumably the poster's question is about material already manufactured and supplied so this might be irrelevant.

Posted By Merv Newman One of the uses for carbon fibre is to make brake discs for really high-speed applications. Formula 1 racing cars and aircraft. The process also includes machining of the surfaces. When I worked at the plant there were no mentions of toxicity or allergens and no special ventilation of handling equipment was seen. Merv