In this episode of Hardware Startups with Fexingo, Lucas and Luna explore how early-stage hardware companies are using hermetic sealing to protect sensitive electronics from moisture, gases, and contaminants. They break down the science behind hermeticity, the different sealing methods—from laser welding to glass-to-metal seals—and the trade-offs between cost and performance. Using the example of a medical implant startup, they show how a tiny leak can lead to catastrophic failure, and why testing for hermeticity is becoming more accessible to smaller teams. They also discuss when it's worth investing in true hermetic sealing versus less expensive conformal coating, and how new materials and processes are lowering the barrier to entry. If you're building hardware that needs to survive harsh environments, this episode will give you a practical framework for deciding if hermetic sealing is right for your product.