Questions tagged [potting]

The processes of completely containing a PCB or entire electronic device in a compound designed to protect it from vibration, moisture, etc.

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0answers
20 views

RF and encapsulation materials

I have a WiFi application that we need to encapsulate for environmental reasons. We did some test shoots with Krayden PA2692 since the molder had experience with it. It's a polyamide material. The ...
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3answers
93 views

What could be the reason for chip capacitor failure due to silicone potting?

Is silicone potting of PCB board beneficial or risky? What could be the best material for encapsulating a power supply board? I used 2 part mixed silicone potting compound for encapsulating a ...
6
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1answer
145 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 ...
2
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1answer
357 views

Potting microSD card inserted in slot with epoxy resin

I would like to know whether it is possible to completely cover/pot a microSD card inserted in a slot (which is soldered on a pcb) with an epoxy resin. Will the sd card continue working properly? Will ...
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1answer
147 views

PCB material that does not swell from water absorption?

We designed a microchip to sense high pressures under water. The chip senses pressure through a thin diaphragm that deflects and a corresponding piezoresistor circuit that measures the deflection. For ...
1
vote
1answer
113 views

Is there an appropriate “potting” compound for a DC power barrel connector?

I need to modify the DC connector on about 100 AC/DC power supplies and will be installing a barrel connector like this: I would like to make the connector more permanent and prevent a user from ...
2
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2answers
622 views

Board to Board Connections in Potted Electronics

We are contemplating a design which will need 2 PCBAs and be potted. One board is quite "special" so it's rather impractical to reduce the design to a single PCBA. The conventional wisdom is that ...
1
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0answers
452 views

ESP + Lithium Battery Potting

I'm designing a monitoring system for plants based on a lithium-ion battery and an ESP8266 (Adafruit Huzzah board). Due to the application, water may come in contact with the battery and/or ...
1
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1answer
105 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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0answers
107 views

Potting a board with SMTs

I am trying to find the correct potting compound for a device that will sit on top of lead acid batteries. It will have SMTs, and we would like it to tolerate temperatures as low as -40. Because of ...
2
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3answers
2k views

Is hot melt glue suitable as potting compound?

I need some small/cheap waterproof junction boxes for some 12v garden lighting. I am considering using little (25mm x 25mm x 15mm) potting boxes and after soldering the wires, then filling the potting ...
11
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5answers
621 views

Pebbles in potted electronics

I was recently taking a look at a failed power supply for 12V halogen lighting and noticed an unusual texture in the potting compound. I tried chipping some of it away with a screwdriver and got a ...
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1answer
321 views

Embedded microstrip antenna

How well known are embedded microstrip antennas in general and are they feasible. I want to pot a 2.4 Ghz antenna for product reliability/water and shock proof reasons, but finding information and ...
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1answer
371 views

Potting transformers for mechanical noise reduction

Potting some noisy transformers failed to reduce the sound. My question is where the problem might be. The setup is a row of small (about 0.75x2x4 cm) transformers on a PCB as part of a power circuit....
5
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1answer
977 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 ...
2
votes
1answer
593 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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4answers
456 views

How to protect trade secrets on board with SMD components?

I have a design which uses a secret technique, and I would like it to remain secret, at least for a period of time. My plan was to pot the board in epoxy. Specifically, MG Chemicals 832TC is ...
3
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4answers
997 views

USB Circuit Failure After Potting

I'm experiencing a strange failure of electronics after potting which I'm hoping to get some more insight and explanation to. The device is a custom, rugged USB drive in an Aluminium/Titanium body (...
4
votes
3answers
2k views

Is there a cheap thermally conductive, electrically insulating potting compound?

I've got some some ready-made 12v LED units. I wanted to pot each and put it in a metal container for robustness and to try and dissipate some heat. I'd like to pot the circuit but was hoping to ...
4
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2answers
2k views

Potting Connectors

I work for a company manufacturing electronics. We have a few products where we pot boards into enclosures. Where it is done the incoming connections are always soldered for fear of condensation ...
9
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2answers
666 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 ...
21
votes
3answers
676 views

How do you build a machine in a solid block?

I'm aware that a number of mass produced electronics are embedded in a solid thermal resin of some form. How reasonable is that for the home hacker? What materials are used? How do you do it? Are ...
3
votes
3answers
2k 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 ...
18
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6answers
45k 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 ...
12
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10answers
1k 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 ...