Electronics Forum | Thu Apr 28 11:14:27 EDT 2005 | bbarr
If you apply the RTV after coating, what happens to bond strength since you are now bonding to the coating and not the board? Will the caps still survive vibration and shock? I specify applying RTV before coating for this reason. Am I correct? I als
Electronics Forum | Wed Jan 03 21:20:22 EST 2007 | davef
Comments are: * General purpose RTV (RTV-108) releases an acetic acid (vinegar) during cure and corrodes copper, brass and sensitive metals. It is therefore NOT for use in delicate electrical or electronic applications. However, there is an electrica
Electronics Forum | Thu Apr 21 10:44:35 EDT 2005 | jdumont
Morning all. So today I have been tasked with conformally coating a few of our first run PCBs for a new product line. The problem is that they have already had all the larger caps potted with RTV. Are there any problems with spraying the CC over the
Electronics Forum | Wed Jan 03 15:11:09 EST 2007 | kennyg
Is it acceptable to apply an acrylic conformal coat, cure and then apply a silicone RTV on top (for staking tall components)? Should there be a concern with the bond between the acrylic and the RTV?
Electronics Forum | Thu Apr 21 11:43:03 EDT 2005 | davef
We understand the problem of trying to coat over RTV. We have seen the same problem with acrylic and urethane coatings not wanting to stick to RTV. Some acrylics seem to be worse than urethane. Since this is a new product, may be you could pot your
Electronics Forum | Thu Jun 22 09:31:21 EDT 2000 | Rich Ziebell
All, Can anyone point me in the right direction for (sources of info) various ways to quickly cure RTV or atleast speed up the process. Our requirements are to use Dow Corning 3145 hi-temp RTV. I have tried contacting the manufacturer but am losing
Electronics Forum | Thu Apr 21 12:35:15 EDT 2005 | jdumont
Well that doesnt sound very promising. What im going to do is make sure these two boards I just coated (with the RTV already cured) will be used in house only. In the future we will do any conformal coating operations before potting with whatever mat
Electronics Forum | Thu Feb 07 18:19:38 EST 2008 | mobytahoe
We are experiencing corrosion and subsequent pcb contamination from the RTV material used to secure a Power Supply. The degradation takes place over a few weeks. The power supply vendor is balking at liability, our OEM customer is screaming. Anyone
Electronics Forum | Thu Feb 07 20:59:10 EST 2008 | davef
We bet your customer has freaked-out. Some common RTV out-gas ammonia during cure. Many types of RTV depend on strong acetic acid to work. Also, ammonia plus water in the air produces ammonium hydroxide, an aggressive alkali. We've talked about this
Electronics Forum | Thu Jun 22 16:48:17 EDT 2000 | MikeF
Most RTV's depend on atmospheric moisture to cure. You can put them in an oven with a pan of water and that will speed up the cure. I'd suggest about 150 to 180 degree F, time period to depend on the thickness of the RTV. You'll have to do some tests
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