Graham Naisbitt wisely opines:

I was once asked: "does you coating survive exposure to "Skydrol", an
aviation hydraulic fluid that should NEVER be drunk!!! (Worse than Mountain
Dew I am told!)

**True.  One of the few things more harmful than Mountain Dew.  It is a
very corrosive and goes through acrylic coatings like a hot knife through
butter. It's almost impossible to clean thoroughly from a board without
destroying the assembly.

I asked why, and was informed that it was: "in case the circuit gets
sprayed
by this stuff whilst in flight."

My reaction: "This is a circuit in the cockpit of the aircraft, and you are
worried about the effects of a hydraulic leak of Skydrol spraying onto a
circuit in a sealed housing - why? There ain't no pilot still in there...."

**I bet the housing was not truly sealed.  In addition, avionics are
sprinkeled all throughout the plane and not just in the cockpit.  Avionics
bays are often co-mingled with hydraulic lines.  Avionics are in the wings
with the fuel tanks.  Under the toilets.  Most aircraft manufacturers and
the FAA want you to show that your coating will survive common aircraft
fluids.  Knowledge of your end-use environment and possible contaminants is
critical in a choice of coatings.

Doug Pauls

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------