For bonding/staking wires, TakPak works okay unless you are using Teflon
insulation, then it will wick off too fast without sufficient staking -
even with the accelerator 7452. We switched to Loctite 499 with the
accelerator; it is not as thin & encapsulates the wire. However, this
was a few years back so don't know if the 499 is still used (or
available) but we don't use TakPak 382.
As for pwb repairing, we use both the 2pt epoxies & cyanoacrylates to
cover exposed fibers - depending intended environment
LA
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Robert Kondner
Sent: Friday, March 06, 2009 9:42 AM
To: [log in to unmask]
Subject: Re: [TN] Coatings, epoxies, etc crash course
Hi,
For bonding jumper wires to a PCB surface we use the Tak Pak series of
instant adhesives. Bonds in a few seconds.
Is there something better? Inquiring minds want to know.
Bob Kondner
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: Friday, March 06, 2009 12:17 PM
To: [log in to unmask]
Subject: Re: [TN] Coatings, epoxies, etc crash course
Hi Genny
A good place to start would perhaps be to talk to Dymax
http://www.dymax.com/ (no affiliation). We borrowed a UV cure wand from
them and tried some UV cure materials. Worked well, but I couldn't cost
justify it for the project - it was to bond some jumper wires.
regards,
- Graham
-----Original Message-----
From: Genny Gibbard [mailto:[log in to unmask]]
Sent: Friday, March 06, 2009 12:51 PM
To: TechNet E-Mail Forum; Collins, Graham (FN) @ ESI
Subject: RE: [TN] Coatings, epoxies, etc crash course
Thanks. The general principle of UV curing sounds fantastic, but it's a
bit of which came first - chicken or the egg...
We've never used UV cure materials here, and we don't have any of the
equipment to do it.
I looked into it a bit last year, but like I said in different words
below, 'I don't know what I don't know'. I don't know exactly what I
need for equipment, or what material to use where, and I don't know how
to get up to speed on this process.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: March 6, 2009 10:46 AM
To: [log in to unmask]
Subject: Re: [TN] Coatings, epoxies, etc crash course
A UV cure material?
regards,
- Graham
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Genny Gibbard
Sent: Friday, March 06, 2009 12:35 PM
To: [log in to unmask]
Subject: [TN] Coatings, epoxies, etc crash course
Hello all,
I do a lot of component and material sourcing, crossing, and spec'ing.
Probably the area I struggle with the most is the materials, like
epoxies for board repairs, or adhesives, or sealants, cleaners, etc
etc,...I did electrical engineering, not chemical.
Is there any good resource place to get a handle on when you want an
acrylic versus an epoxy, or silicone, or ... basic properties, what
environment they are needed for, etc.
A specific sourcing question I have right now - for challenging board
repairs we use specially trained operators in a rework cell that use a
2-part epoxy to repair FR4. One product has a track cut, that usually
causes weave exposure, that happens on every board on the line to allow
for different configurations, and they want a way to protect it
adequately with a 1-part quick curing material without sending it to the
rework cell. We've tried those conformal coat pens, and they can be
washed right off the board. Any suggestions?
Genny
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