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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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Difficulty in gaining Class II CE certification for an aluminium single-sided PCB

We have a product that consists of an aluminium single-sided PCB with micro-controller and LEDs soldered to the copper side. The PCBA is shaped so that it can be bent to fit over the scalp of the user ...
Ron Brown's user avatar
0 votes
1 answer
29 views

Can I treat the thermal shock test temperature as the continuous operating temperature of a conformal coating?

We are using this conformal coating on our design, HumiSeal 1B73EPA. However, it does not state in the datasheet the continuous operating temperature for the coating, only the thermal shock test ...
Never's user avatar
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1 answer
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Can I use clear acrylic spray paint as conformal coating?

I have some electronics that are to be installed in a very damp location: an underground potable water pump station. This station is an underground concrete vault with some pumps and related ...
Ryan Griggs's user avatar
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4 votes
0 answers
29 views

How to handle masked areas of a conformally coated board?

If I'm designing a board which will be exposed to humidity, temperature swings below dew point, etc and I decide to conformally coat the board to help protect it. How should you treat areas that need ...
VBwhatnow's user avatar
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What can cause dust to stick to only one spot on a PCB?

A field PCB got returned due to not accepting a firmware update. Upon inspection, the board has a small area between some ICs and resistors that has a large buildup of dust while the rest of the board ...
orange1234's user avatar
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124 views

Rework with a coating over the solder joint

I've got a simple board to repair (a switch/junction board for a fancy bike light). The wires to a DC connector broke because of insufficient strain relief. It's a trivial job, except there's a paint-...
Chris H's user avatar
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5 votes
1 answer
360 views

Conformal Coating Shielded RF Module

Re: Conformal coating of shielded RF modules I have an IoT device that consists of a PCB that goes inside a watertight enclosure. The device will operate under constant water, since it will be ...
Dan Alvarez's user avatar
1 vote
1 answer
715 views

Conformal Coating on Raspberry Pi

I'm planning to build a security camera with a Raspberry Pi 4B in it with the camera being an IR camera I found online. Being a security camera, I'm planning to put it outside my house. Where I live ...
Hao C.'s user avatar
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-1 votes
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Plastik 70 coating increased current usage

I have a well tested PCB which uses 12µA in sleep mode. I decided to apply conformal coating. I must say I was a bit liberal with the spray (Plastik 70.) I waited around 30 minutes before checking ...
Ouroboros's user avatar
  • 233
5 votes
2 answers
1k 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 ...
Stefan Wyss's user avatar
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2 answers
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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 ...
LazyTurtle's user avatar
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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 ...
user233061's user avatar
0 votes
2 answers
1k 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+ ...
user1969903's user avatar
4 votes
1 answer
313 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 ...
stowoda's user avatar
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2 answers
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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 ...
Suvi_Eu's user avatar
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0 answers
153 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.
user1219721's user avatar
5 votes
3 answers
1k 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 ...
Alex I's user avatar
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7 votes
3 answers
1k 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 ...
MartinF's user avatar
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11 votes
5 answers
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. ...
Mahmoud Ragab's user avatar
6 votes
1 answer
1k 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 ...
Steve's user avatar
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1 vote
3 answers
587 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 ...
Nikk's user avatar
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2 votes
2 answers
411 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 ...
Bort's user avatar
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1 vote
1 answer
2k 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 ...
user94959's user avatar
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7 votes
1 answer
268 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 ...
Nobody's user avatar
  • 171
0 votes
2 answers
178 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 ...
Zulaxia's user avatar
  • 103
1 vote
1 answer
163 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 ...
My Other Head's user avatar
0 votes
1 answer
7k 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 ...
User323693's user avatar
  • 9,321
2 votes
2 answers
2k 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 ...
mehfoos yacoob's user avatar
0 votes
1 answer
224 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 ...
jokeroor's user avatar
0 votes
1 answer
1k 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 ...
Rocky79's user avatar
  • 337
1 vote
1 answer
1k 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 ...
archaeopteryx's user avatar
0 votes
2 answers
522 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?
Angs's user avatar
  • 3,305
3 votes
1 answer
172 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 ...
rdtsc's user avatar
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2 votes
2 answers
262 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 ...
Stephen Collings's user avatar
0 votes
1 answer
5k 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 ...
Gabriel Staples's user avatar
5 votes
2 answers
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 ...
Richard's user avatar
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1 vote
1 answer
410 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 ...
Jet59black's user avatar
4 votes
3 answers
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 ...
eduardo's user avatar
  • 87
2 votes
1 answer
737 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 ...
Marc Moolenaar's user avatar
7 votes
2 answers
812 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 ...
Steinar's user avatar
  • 768
9 votes
2 answers
745 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 ...
JimFred's user avatar
  • 703
4 votes
3 answers
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 ...
JimFred's user avatar
  • 703
2 votes
3 answers
454 views

conformal coating

What's the best way to remove this??? I have tried alcohol and simple solvents to no
Thomas Johnson's user avatar
20 votes
7 answers
54k 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 ...
edebill's user avatar
  • 2,519
15 votes
10 answers
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 ...
stuckie27's user avatar
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