-----Original Message-----
From: Mel Parrish [mailto:[log in to unmask]]
Sent: Tuesday, January 08, 2002 1:33 PM
To: [log in to unmask]
Subject: Re: [TN] Staking compounds

Hans

Recommend looking very closely at the Z, CTE characteristics of the RTV also.  I had some hardware reliability issues in defense products years back where the PTHs were partially extracted from the board due to RTV staking under the components. More specifically these were PGAs.

Also recommend keeping in mind that the conformal coating is a limited environmental barrier at best for moisture.

 

Mel Parrish

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Hinners Hans M Civ WRALC/LUGE
Sent: Tuesday, January 08, 2002 6:44 AM
To: [log in to unmask]
Subject: Re: [TN] Staking compounds

Hi All,

 

This is great information.  I've had an Assembly supplier suggest using an RTV to stake discrete components to FR-4.  Graham confirmed that it wasn't a good combination with a silicone based conformal coating.  (Thanks Graham.)  The last thing I or the customer needs is dewetting of the conformal coating.  My applications are hi-rel military avionics - in a rather harsh environment: high vibration, high humidity and some salt water.

 

Is there some cutoff point when it's better to go with mechanical staking?  I'm new to staking.

 

Hans

 

Integrity First  -  Service Before Self  -  Excellence in All We Do
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Hans M. Hinners
Electronics Engineer
Warner Robins - Air Logistics Center (WR-ALC/LUGE)
226 Cochran Street
Robins AFB GA 31098-1622

mailto:[log in to unmask]

Com: (478) 926 - 5224
Fax:   (478) 926 - 4911
DSN Prefix: 468

-----Original Message-----
From: Dieselberg, Ron [mailto:[log in to unmask]]
Sent: Tuesday, January 08, 2002 7:28 AM
To: [log in to unmask]
Subject: Re: [TN] Staking compounds

Doug, we have used CONAP K-20 for a long time with good results. We have also used Loctite 416 with 18580 activator. The Loctite is easier to use since it "sets" more quickly.

All depends on how you want to use it and how much time you have available for curing.
In either case be sure the materials that you are going to stake to are "sqweekey" clean!

Ron Dieselberg
Trainer/Auditor
CMC ELECTRONICS
CINCINNATI
[log in to unmask]

-----Original Message-----
From:   [log in to unmask] [mailto:[log in to unmask]]
Sent:   Monday, January 07, 2002 14:41 PM
To:     [log in to unmask]
Subject:        [TN] Staking compounds

Good day all,

I am curious as to what all y'all use for staking compounds (to fix wires
or components in place) on your assemblies, especially if you are in the
high-rel area or aerospace sector.  Thanks.

Doug Pauls
Rockwell Collins

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
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 delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL
To recieve ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------