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Saturday, September 24, 2011

Comparative exposure levels to airborne asbestos fibers

Comparative exposure levels to airborne asbestos fibers (Fibers per millilitre)
Asbestos Claim

* Environmental Exposure 0.0001 fiber/mL
* Rural environmental exposure 0.0001 fiber/ml
* Urban environmental exposure 0.0001 to 0.001 fiber/ml
* Environmental exposure downwind from an asbestos cement plant at 300 m: 0.0022 fiber/ml
* Exposure in buildings with friable asbestos concentrations 0.001 to 0.01 fiber/ml(counted with an optical microscope)
* Controlled removal of "Artex" (3% to 5% Chrysotile) textured decorative coating: 0.08 fiber/ml
* Vigorous dry scraping for 60 minutes to remove textured decorative plaster from a wall: 0.09 fiber/ml personal sample, estimated PCME
* Throwing asbestos cement sheets into lorry 0.161 fiber/ml personal
* "Representative" Asbestos cement roof Removal: Not detected to 0.2 fiber/ml personal
* "Representative" Asbestos cement roof Repair: Not detected to 0.3 fiber/ml personal
* Asbestos cement sheets stacked in confined space 0.30 to 0.53 fiber/ml personal
* Hand sawing asbestos cement sheets and pipes < 1 fiber/ml
* Careful removal of whole asbestos insulation boards by unscrewing with shadow vacuuming and spray application of a wetting agent on unsealed surfaces: Up to 3 fiber/ml
* Jig sawing asbestos insulation board with LEV 1 - 5 fiber/ml
* Opening raw material Chrysotile from Chongqing, China, asbestos plant 5.8–7.5 fiber/ml
* Drilling overhead asbestos insulation boards (No LEV): 5 to 10 fiber/ml
* Hand sawing asbestos insulation board (No LEV): 5 to 10 fiber/ml
* Jig sawing asbestos insulation board (No LEV): 5 to 20 fiber/ml
* Breaking and ripping out asbestos insulation boards dry with no unscrewing: 5 to 20 fiber/ml
* Abrasive disc cutting of asbestos cement sheets and pipes without LEV 15 to 25 fiber/ml
* Bagging raw material Chrysotile in Chongqing, China, asbestos plant (1999) 5.2–58.4 fiber/ml
* Sweeping asbestos insulation board debris up to 10 fiber/ml
* Dry removal of asbestos lagging up to 100 fiber/ml
* Dry removal of sprayed (limpet) coating up to 1000 fiber/ml
Asbestos Claim
Asbestos claim: asbestos-types-and-associated-fibers.