Making electronics waterproof
Intro
Waterproofing electronics requires more than just using a waterproof enclosure, as condensation often forms within the housing. Below, I discuss my experiences and methods for effectively protecting electronics from moisture, including PCB protection, housing sealing, and using pressure balance elements to prevent internal condensation.
1. Waterproofing the PCB
Kafuter K-705 clear silicone rubber RTV Adhesive: My experience has been very positive. It’s easy to apply with a piece of paper, allowing it to spread evenly while avoiding connectors. Additionally, the tube doesn’t dry out over time, unlike other silicone products.
Kafuter K-705 silicone waterproof conformal coating for PCB
Kontakt Chemie Plastic 70: Although this spray is commonly used, it performs poorly. The coating shrinks, leaving the tops of SMD components unprotected. To achieve proper water protection, you need to apply at least five thick layers. Additionally, it’s challenging to keep connectors free of coating during spraying.
2. Waterproofing the electronics enclosure
For testing, I used an aluminum enclosure from an e-bike motor controller. I wanted to test if a very narrow 1mm gasket would be effective. I tested with Superhelp Black Silicone Gasket Maker and left the enclosure outdoors in all weather conditions for one year. The result was positive: the enclosure remained completely waterproof throughout the year.
IP67 waterproof electronic enclosure
IP67 waterproof electronic enclosure
Waterproofing electronic enclosure with silicone gasket.JPG
3. Pressure balance element
Condensation inside sealed enclosures is inevitable due to temperature fluctuations. To manage this, I use a self-adhesive IP67 waterproof venting membrane. This allows moisture to escape from the enclosure but prevents moisture from entering.