How Hardware Startups Use Overmolding to Seal and Strengthen

Hardware Startups with Fexingo: Devices, Robotics, and Manufacturing Tech Companies · Jun 18, 2026 · 10m · transcript

Episode 58 of Hardware Startups with Fexingo dives into overmolding — the process of encasing electronics in a second plastic layer for waterproofing, impact resistance, and cable strain relief. Lucas and Luna examine how a hypothetical smart outdoor sensor startup uses a two-shot injection molding process to achieve IP68 rating and survive a five-foot drop. They break down the tooling cost — $30,000 to $80,000 per cavity — and the design rule that overmold thickness should stay under 3 millimeters to avoid cycle time blowups. They also discuss why overmolding fails when incompatible…