Eric/Joe, et al:
The ciliosis caused by the dust isn't necessarily unique to silicon diox. It
had been studied extensively in relation to beryllium. In a nutshell,
respiratory distress is caused by particulates of a specific size. If the
particles are too big, the are egested from the lungs by coughing; too small
and they are egested through exhaling. However, particles that exist in
between these two extremes (for beryllium, I seem to remember that it was
about 0.5um down to about 0.05um, but don't quote me) get trapped in the
cilia of the lungs and stay. They clog the breathing viaducts and sacs, and
cause pneumonia-like symptoms. In certain instances, such as beryllium, they
can be toxic (typically renal-centric symptoms may also develop). Certain
materials (for example, alumina) can actually lacerate the lung linings. The
respiratory ailments are akin to the better know "black lung disease" that
coal miners used to get before the problem was fully understood.
Use of appropriate respiratory, eye and ear precautions is always
recommended; if appropriately heeded per the 'dust' MSDS, you shouldn't have
a problem.
You may want to check with the local PHS facility before proceeding.
Please note that I am not an M.D. or epidemiologist, and so my comments
should not be taken as medical advice.
> Bill Davis, Ph.D
> MS&PF
408-273-2921
[log in to unmask]
-----Original Message-----
From: Eric Kalgren [mailto:[log in to unmask]]
Sent: Thursday, October 28, 1999 1:33 PM
To: [log in to unmask]
Subject: Re: [TN] sand-man
I don't know many specifics, but I do know that as a lifeguard/swimming pool
maintence guy I was warned repeatedly about the adverse health effects
associated with the inhalation of fine silicon particles. Wasn't given
anything specific, just horror stories about asthma, chronic bronchitis, and
other respiratory ailments.
Eric Kalgren
BFGoodrich Aerospace
Data Systems Division
>>> Joe Wojniak <[log in to unmask]> 10/28/99 01:15PM >>>
Related to sand and aluminum oxide:
I was watching a TV show doing a documentary on etching pictures into glass
by sand blasting. The artist was using aluminum oxide instead of sand
because there are apparently health risks associated with sand.
Don't know if it's true or just Hollywood...
-Joe Wojniak
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Vaughan, Ralph H
Sent: Thursday, October 28, 1999 9:33 AM
To: [log in to unmask]
Subject: [TN] sand-man
For anyone who would like a diversion from the assembly processes, I have a
different question.
My Army customer is simulating field testing of a weapon system to check the
abrasion resistance of some treated metal surfaces (tungsten carbide) that
rub together during flight. The 'sand' that they are using to contaminate
these areas is aluminum oxide. Needless to say, excessive scoring is
observed on the metal faces. My contention is that sand is primarily
quartz, or silicon dioxide, which is softer than the Al2O3, and the system
is being over-tested.
Anyone have a notion of the acceptable sand type used in environmental
tests?
Thanks
Ralph Vaughan
Boeing-Fleming
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