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March 2004

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Subject:
From:
David Douthit <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 9 Mar 2004 13:14:48 -0700
Content-Type:
text/plain
Parts/Attachments:
text/plain (593 lines)
Blair,

For "Class 3" operation they'd better. High humidity (>60%) can generate
thin aqueous films that react the same as bulk water.

David A. Douthit
Manager
LoCan LLC

Blair K. Hogg wrote:

>They won't - I know from experience. But, do you want to pay $50 for a keyboard that will take spills, or $10 for one that won't?
>
>
>
>>>>[log in to unmask] 03/09/04 01:54PM >>>
>>>>
>>>>
>        Shouldn't  PWA modules be protected from any liquid? We can not
>expect a keyboard survive a coffee spill.
>        Ramon
>
>
>
>>-----Original Message-----
>>From: Randy Bock Sr. [SMTP:[log in to unmask]]
>>Sent: Tuesday, March 09, 2004 12:48 PM
>>To:   [log in to unmask]
>>Subject:      Re: [TN] FW: [TN] Pros and Cons on Type UR vice Type AR
>>
>>
>Conformal Coating
>
>
>>Bug juice concetrate makes a good bright work cleaner.    Turko cleaner
>>was the thing to clean with.  Mixed with water did ok.  Straight would
>>turn your hands to wrinkled prunes.
>>
>>
>>
>>Randy Bock Sr.
>>Quality Manager
>>GMS Naugatuck
>>(p) 203 720-3861
>>(f)  203 729-5397
>>(email)  [log in to unmask]
>>
>>
>>
>>
>>David Douthit <[log in to unmask]>
>>Sent by: TechNet <[log in to unmask]>
>>03/09/2004 12:29 PM
>>Please respond to
>>"TechNet E-Mail Forum." <[log in to unmask]>; Please respond to
>>David Douthit <[log in to unmask]>
>>
>>
>>To
>>[log in to unmask]
>>cc
>>
>>Subject
>>Re: [TN] FW: [TN] Pros and Cons on Type UR vice Type AR Conformal Coating
>>
>>
>>
>>
>>
>>
>>Ramon,
>>
>>You might be amazed at what cleaning crews use on the interior and
>>exterior of aircraft.
>>
>>David A. Douthit
>>Manager
>>LoCan LLC
>>
>>Dehoyos, Ramon wrote:
>>
>>
>>
>>>       Thanks for the correction.
>>>       Ramon
>>>
>>>
>>>
>>>
>>>
>>>>-----Original Message-----
>>>>From: Crepeau, Phil (Space Technology)
>>>>Sent: Tuesday, March 09, 2004 10:44 AM
>>>>To:   Dehoyos, Ramon
>>>>Subject:      RE: [TN] FW: [TN] Pros and Cons on Type UR vice Type AR
>>>>
>>>>
>>>>
>>>>
>>>Conformal Coating
>>>
>>>
>>>
>>>
>>>>i think you meant type ar not ur.
>>>>
>>>>-----Original Message-----
>>>>From: Dehoyos, Ramon (NG)
>>>>Sent: Tuesday, March 09, 2004 6:08 AM
>>>>To: [log in to unmask]
>>>>Subject: [TN] FW: [TN] Pros and Cons on Type UR vice Type AR Conformal
>>>>Coating
>>>>
>>>>
>>>>       One of the disadvantages of UR coating is that it will not
>>>>
>>>>
>>>>
>>>>
>>>withstand
>>>
>>>
>>>
>>>
>>>>solvents. Besides  boards in  aircrafts that might be closed to the fuel
>>>>tank or in automobile  engine compartments, most boards are not in
>>>>
>>>>
>>>>
>>>>
>>>proximity
>>>
>>>
>>>
>>>
>>>>to fuels, acetone or alcohol. So UR is plenty good. It saves a lot of
>>>>
>>>>
>>>>
>>>>
>>>boards
>>>
>>>
>>>>from being damaged during rework due to the simplicity of removal.
>>>
>>>
>>>>       Regards,
>>>>       Ramon
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>-----Original Message-----
>>>>>From: Dehoyos, Ramon
>>>>>Sent: Tuesday, March 09, 2004 8:15 AM
>>>>>To:   [log in to unmask]
>>>>>Subject:      Re: [TN] Pros and Cons on Type UR vice Type AR Conformal
>>>>>
>>>>>
>>>>>
>>>>>
>>>>Coating
>>>>
>>>>
>>>>
>>>>
>>>>>       One thing to know is that AR can be coated to patch UR but not
>>>>>
>>>>>
>>>>>
>>>>>
>>>the
>>>
>>>
>>>
>>>
>>>>>other way around. Patching AR with UR creates a mix that takes too long
>>>>>
>>>>>
>>>>>
>>>>>
>>>to
>>>
>>>
>>>
>>>
>>>>>dry, stays soft. So to switch from UR to AR is recommended.
>>>>>       Regards,
>>>>>       Ramon
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>-----Original Message-----
>>>>>>From: - Bogert [SMTP:[log in to unmask]]
>>>>>>Sent: Monday, March 08, 2004 4:55 PM
>>>>>>To:
>>>>>>Subject:      [TN] Pros and Cons on Type UR vice Type AR Conformal
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>Coating
>>>>
>>>>
>>>>
>>>>
>>>>>>As a Class 3 customer we are considering mandating transition from
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>Type
>>>
>>>
>>>
>>>
>>>>UR
>>>>
>>>>
>>>>
>>>>
>>>>>to Type AR conformal coating, to make it easier to replace failed
>>>>>components.  Are there any Class 3 users of Type AR coating?  What is
>>>>>
>>>>>
>>>>>
>>>>>
>>>>track
>>>>
>>>>
>>>>
>>>>
>>>>>record for using Type AR?  Are there any compatibility issues with
>>>>>
>>>>>
>>>>>
>>>>>
>>>certain
>>>
>>>
>>>
>>>
>>>>>types of solder masks?  Any input you have would help.  Another
>>>>>
>>>>>
>>>>>
>>>>>
>>>advantage
>>>
>>>
>>>
>>>
>>>>>with AR would be for returned equipment.  The OEM could remove all the
>>>>>coating from an assembly using alcohol, then perform
>>>>>
>>>>>
>>>>>
>>>>>
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>>>>http://listserv.ipc.org/archives
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>>>>
>>>>>>Please visit IPC web site
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>>>>>>
>>>>>>
>>>>http://www.ipc.org/contentpage.asp?Pageid=4.3.16
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