Good to know JK. In a previous, we used to use a lot of silicone coating (90 %) and used tape and a hot material poured in the connector to seal it to prevent what you are sharing with us. A tape was put around the connector. The hot material was pour and the end of the tape was closed in and the material solidified very quickly. Each plug was done in seconds. At demasking the tape and solid plug was discarded. Boards could be immersed in the coating. Ed Mines could enlighten us more about this subject. Regards, Ramon -----Original Message----- From: Joyce Koo [mailto:[log in to unmask]] Sent: Tuesday, February 06, 2007 12:11 PM To: TechNet E-Mail Forum; Dehoyos, Ramon Subject: RE: [TN] Humiseal Masking Tape Residues/latex peelable Not only the viscosity issue. silicone is well known to migrate to the electrical contact surface due to outgas, (both relay and connectors). It will form an "almost" inorganic hard coating (after oxidation) on the surface of the contact. Initially, you can still arc it through, but eventually, you will get an open...Many papers in the mid 80s study the events (if I remember correctly, IEEE publication got few non-conference papers). jk abcd -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Dehoyos, Ramon Sent: Tuesday, February 06, 2007 12:03 PM To: [log in to unmask] Subject: Re: [TN] Humiseal Masking Tape Residues/latex peelable It depends on the viscosity of the coating. If it is viscous enough, about 30 seconds on Zhan cup # 2, it will not wick up. Ramon -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Hogg, Blair K. Sent: Tuesday, February 06, 2007 10:43 AM To: [log in to unmask] Subject: Re: [TN] Humiseal Masking Tape Residues/latex peelable Just be careful to only use sealed connectors - conformal coating (we use type AR) likes to travel - it can wick up into an unsealed connector and contaminate the mating surfaces. We had one board here we were spraying while hanging vertically - there was an unsealed relay on the board and it traveled up into the relay and gummed up the armature. This may be limited to acrylics - urethanes may not behave this way. We only started having this problem when we changed from a urethane to an acrylic coating. Blair -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory Sent: Tuesday, February 06, 2007 8:15 AM To: [log in to unmask] Subject: Re: [TN] Humiseal Masking Tape Residues/latex peelable Mornin' Everyone! I have Graham's "Das Boot" picture up! It's at: http://stevezeva.homestead.com/files/Connector_Boot.JPG Hey Graham, what is the part number of that boot? I could use that here... -Steve Gregory- -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins Sent: Tuesday, February 06, 2007 6:27 AM To: [log in to unmask] Subject: Re: [TN] Humiseal Masking Tape Residues/latex peelable Hi Kenny! We use a different style compared to Steve's (for the most part, though we do have a couple of applications like his). I've sent Steve a pic to post on his site. The pic is from my trial before we started using them. In the picture there is a side view of a connector with a boot on it, as well as a top view of a similar connector so you can see what the boot masks. It covers the pins, hardware, and the mating area. The boot in the pic was sprayed and then after it cured I flexed the boot and picked the cured coating off - there are some flakes remaining but nothing that would cause issues in repeated use. We also use a similar boot on header pins - considerably faster than masking them. We purchased the ESD safe versions of these - a conductive rubber is used. The boot in the pic is not ESD safe - which is why it is living in my desk. Kinnarney can also make custom designs for you, but at a price - so ponder the cost carefully vs the labour offset. regards, Graham Collins Process Engineer, L-3 Communications Electronic Systems Inc. Halifax (902) 873-2000 ext 6215 ******************************************************************* This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. 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