Questions tagged [conformal-coating]

Conformal coating is an insulating material applied to PCBs to protect against damage to the electronics. You can use this tag for questions about protecting PCBs with conformal coating and for issues with debugging/editing PCBs which have already been conformal coated.

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39 views

Humidity design requirements

I have to design a electronics device that is specified for environmental operating conditions of 0°C to 60°C with 5% to 95% relative humidity (non condensing). I think the temperature part should be ...
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2answers
57 views

PCB conformal coating / potting / resin in an IP65 case

I'm designing a PCB that will be installed in an IP65 plastic case. The device will be installed in multiple scenarios and regions (indoors, outdoors, high/lo temperatures, high/lo humidity etc). The ...
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81 views

Can USB head cause a spark?

I made a USB port in a gas detector prototype. I plan to keep a USB cable attached to that USB port forever. I silicone conformal coated the USB port pins on the PCB. Can the USB head of the cable ...
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2answers
114 views

What motherboard components can I safely conformally coat and will this prevent condensation damage?

I plan on building and installing a small computer in my car for multimedia purposes. Since the only space I have for it is under the passenger seat and since the temperatures vary between -20 to 35+ ...
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1answer
126 views

Conformal coating of UHF (radio frequency) circuitry 400 - 1000 MHz

Do you have experience applying conformal coating on UHF circuitry (ISM band)? Are there known issues (e.g. degradation of UHF performance) which arise when coating UHF components like filters and ...
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2answers
319 views

What type of conformal coating must I use and where must it be applied over the PCB?

I have designed the layout of a PCB that will have an unique area with crimpage terminal connectors receiving 6KV by an external wire. I have done the shortest polygon (instead traces) for 9 PCB ...
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0answers
62 views

Conformal coating of shielded RF modules

What is the best practice to protect a circuit with shielded RF modules? I have a feeling that conformal coating is difficult since the shield is not sealed.
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3answers
547 views

Clean vs no-clean for high voltage circuit

I have a board that has fairly high working voltages up to 100V with small clearances down to 12 mil between the high voltage and ground or low voltage nets. This is unavoidable because the whole ...
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3answers
294 views

Should I re-apply conformal coating after hot air soldering?

I'm working on a PCB of a drone. It had some failed MOSFETs that I've replaced using hot air soldering. It works fine again, but parts of the PCB were covered in a glue-like substance which I think ...
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3answers
3k views

Making a device explosion proof

I am working on prototyping a gas leak detector device to be used in homes, it should have two small windows in the casing to allow sound to go out and the other window allows gas to reach the sensor. ...
6
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1answer
453 views

Can you tell me more about “re-enterable” potting compound?

I heard the term "re-enterable potting compound", which is a gel-like (possibly hard?) material that can be used to fill electronics enclosures for water intrusion protection and other things. What ...
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3answers
414 views

Parylene as conformal coating for PCBs

New to conformal coating and would like some recommendations. From what I've read, it seems like parylene would be a good bet since it is chemically stable, makes an excellent barrier material, has ...
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2answers
174 views

What circuit performance changes may be caused by conformal coating?

I realize that, in principle, conformal coating should be inert and not affect a circuit's behavior, but are there any real-world performance changes to look out for when using conformal coating? I ...
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1answer
1k views

Conformal Coating PC Parts?

I couldn't find any topics relating specifically to this sort of thing, and even tried asking folks over on Reddit at /r/buildapc, but I didn't get many responses or many people know if it would be ...
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1answer
147 views

Acceptable conformal coating expansion ratio for PCB with delicate SMT parts?

I have heard that conformal coatings can put stress on SMD parts because of expansion/shrinking while curing or because of temperature differences. How much of a problem is this? The only value ...
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2answers
150 views

Cheap and easy way of coating breakout board/wires black?

Part of my housing for an arduino based project leaves the back of a screen breakout board and several wires visible through a grill and I need to cover these in black to minimise visibility as the ...
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1answer
139 views

Conformal coating compatibility - parylene- or polyurethane-based vs aqueous NaSiO4

How compatible are parylene-based or polyurethane-based conformal coatings for tin-whisker mitigation with aqueous \$NaSiO_4\$ (sodium silicate) conductive coatings used for EMI\RFI\ЕSD protection in ...
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1answer
4k views

HC-SR04 ultrasonic sensor water proofing

I am using the above said HC-SR04 ultrasonic sensor with Arduino pro mini. Till now, able to get the range working properly. My plan is to use this in the overhead tank to measure the quantity of the ...
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2answers
988 views

Can conformal coating help against high-temperature environments if the chips heat up as well?

I have seen many claims of conformal coating helping for protection against, amongst many other things, extreme temperature. One such claim in here would be: Question regarding PCB coating My ...
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1answer
188 views

IP protected Enclosure and Conformal Coating

I have an aluminium Enclosure and I am trying to make it waterproof by using Silicone. Is there any corrosion testing I can perform to Check Corrosion of Silicone or aluminium: to check the ...
0
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1answer
443 views

Liquid Tape for protecting exposed electronic components

I recently found the liquid tape LTB-400 made by Garnder Bender and was wondering if it's Ok to use it to cover IC chips for ESD protection? The circuit board is not placed in a housing, it's sold as ...
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1answer
641 views

Conformal Coating Affecting Inductor?

Question: Could conformal coating affect the properties of an inductor by adhering to its windings? Context and problem: I have a simple boost regulator circuit based around the TPS61230 IC. It ...
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2answers
328 views

PCB coating for a high temperature environment

What PCB coating is good for a high temperature environment (my environment is about 30-70 C), and is available in a spray can or so that is easy to implement without need of a device/machine?
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1answer
142 views

LiFePO4 lithium iron-phosphate cells - OK to dip?

I want to try epoxy-dipping a PCB with an 18650-sized LiFePO4 cell. This is for a low-power application and is slow-charged, so thermal is a non-issue. Before doing anything unforeseen dangerous, is ...
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1answer
145 views

If my electronics are outdoors in a ventillated NEMA 4 enclosure, should I conformal coat my circuit boards?

I'm considering putting a circuit board in a ventilated NEMA 4 enclosure outdoors. I'm a little concerned about humidity and condensation inside the enclosure. Do I need to conformal coat my circuit ...
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1answer
4k views

Waterproofing electronics by dipping into polyurethane or lacquer

I've been looking at and thinking about a few related topics... https://arduino.stackexchange.com/questions/9163/using-arduino-for-industrial-process Reliability of the Arduino platform for ...
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1answer
1k views

Waterproof enclosures

I have a simple farm gate monitor which I'd like to put in a rugged waterproof enclosure to keep it dry enough to operate outside for approximately ten years with no maintenance other than the ...
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1answer
254 views

Coating a soldered connection on a small circuit board

I have a small PCB, about the size of a quarter and having a Bluetooth chip on it. I have 4 wires soldered to the board. 2 of which are for a 3.7 Volt battery connection and 2 are to connect a small ...
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3answers
4k views

PCB opaque coating for anti reverse engineering?

Im trying to find a coating for my PCB in order to protect it from reverse engineering. I want it opaque, non-conductive and with a low thermal resistance. Basically I do not want that someone ...
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1answer
638 views

High failure rates after pcb coating using DC 3140 RTV

We have been protecting PCBs using Dow Corning 3140 for many years now without any problems. Last couple of months however, one board after the other is failing after coating. We can't think of any ...
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2answers
587 views

Conformal coating and micro SD card sockets

I have a embedded computer design which uses a low profile micro sd card socket as an extra option in addition to an on board solid state disk as storage/booting mediums. In manufacture the board is ...
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2answers
700 views

Pour-and-drain conformal coating as an alternative to potting

Is there a standard process to pour conformal coating, similar to potting, but then drain the excess? The benefit of draining the excess is to reduce weight and get better cooling. From my limited ...
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3answers
3k views

Removable/soluble potting compound?

Are there removable/soluble potting compounds that are moisture-proof yet removable without damaging electronic components? I've been able to plunge-mill potted devices to get near enough to ...
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3answers
397 views

conformal coating

What's the best way to remove this??? I have tried alcohol and simple solvents to no
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6answers
50k views

What's the best way to protect a board from corrosion in a hot/moist environment?

Some of my projects need to live outside for long periods. Sometimes, moisture gets into the enclosures. That means that a circuit board might be sitting around in contact with water for hours on ...
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10answers
2k views

Does this exist: Insulating material to cover circuit

For example when you build a circuit you have the board and the components between them is air. Is there a clay like material that will act like air does? Application: you could bundle simple ...