Update on Timber Dust (yep more safety crap)
Given the regular posts regarding dust extraction/respirators I thought some of you may be interested that the ACGIH (american government hygienists) has recently released revised US exposure standards and toxicity information for a couple of timbers.
Birch, Mahogany, Teak and Walnut are now confirmed as “suspected human carcinogens” (i.e only some of the rats got cancer, lets kill some more).
Oak and Beach (USA varieties I believe) are now “confirmed human carcinogens”.
In addition the dust exposure standards have come down dramatically - i.e. no more than 0.5 mg/metre cubed of air for western red cedar dust.
The softwood dust exposure standard has gone from 10mg dust down to 2mg per metre cubed. Hardwood dust remains at 1mg dust per metre cubed of air.
What does all this mean ? https://www.ubeaut.biz/dizzy.gif
Firstly, the more research the more we understand about just how toxic timber dusts are.
Secondly, note that the measurements are in milligrams (mg) – exposures above the stated have proven to have ill effects.
These are very small amounts that can be easily reached when using sanders, mitre saws, bench saws, etc.
It reinforces the need to keep dust away from your head and the need to select, use and maintain a good respirator.
[This message has been edited by Eastie (edited 06 May 2002).]
