RE: [VacuumX] Coating not Adhering
- Hi Jim,Thanks for your help.I have not tried MEK. It is nasty stuff.Do you have a cleaning and coating procedure we could use?Thanks,Peter-----Original Message-----
From: VacuumX@yahoogroups.com [mailto:VacuumX@yahoogroups.com]On Behalf Of Jim RabidWolf
Sent: June 30, 2006 1:53 PM
Subject: Re: [VacuumX] Coating not AdheringWhat did you clean the glass with? Have you tried MEK and lintless cloth? It looks like you have two problems. What was the level of vacuum?One, residue on the glass.Two insufficient velocity of the vapor stream, but mainly the first.Another problem that can occur is if you evacuate the chamber too quickly at first, the water in the air will condense on the surfaces inside the bell jar.Rabid (taking a wild guess here)----- Original Message -----From: peterpekurarSent: Friday, June 30, 2006 9:46 AMSubject: [VacuumX] Coating not Adhering
I'm a new member. A fellow ATM directed me to this group to help me
with a problem I've currently having.
I've got a plate glass mirror which was aluminized twice and in both
cases the coating does not adhere. The coating is bubbling off the
surface in what appears to be similar to the swiping motions used in
the cleaning process prior to coating.
The mirror was dry going in and the relative humidity was low. The
first coating was done using a normal cleaning and neutralizing
procedure but the humidity was really high so we attributed the
coating failure to high humidity. The mirror is very thin and the
low mass may have cuased some condensation on the surface of the
The second coating was performed in the winter when the humidity was
low. The failure looks like cleaning contaminants but I'm not sure
how because we used clean room gloves and optical wipes.
The failure took several months to show up.
Here are a few pics.
Does anyone have any ideas what I could do to correct this?
www.kitgear. com/atm/PICT3739 .JPG
www.kitgear. com/atm/PICT3728 .JPG