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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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-...
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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 ...
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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 ...
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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 ...
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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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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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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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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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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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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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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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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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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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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.
...
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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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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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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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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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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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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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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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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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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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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 ...
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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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