Ralph- Try finding something call "Arizona Road Dust". This is an industry
standard "Dirt" that is predominantly silicon diox, but also has other
constituents. It is generally used by the DOT and automotive industries for
testing metal contacts as well as paint durabilities. Can't help beyond
that...
>  Bill Davis, Ph.D
>       MS&PF
  408-273-2921
[log in to unmask]



-----Original Message-----
From: Vaughan, Ralph H [mailto:[log in to unmask]]
Sent: Thursday, October 28, 1999 8:33 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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