ELASTOMER TOOLING & HUMAN-MACHINE INTERFACE

Silicone Keypad Webbing & Compression Mold Vector Guide

Custom molded silicone elastomer keypads are ubiquitous across industrial handhelds, aerospace cockpits, medical monitors, and automotive steering controls. Designing a keypad requires balancing the tactile snap ratio against flex fatigue endurance, while accounting for high thermal vulcanization shrinkage in steel/aluminum compression mold cavities.

1. Tactile Snap Ratio & Web Geometry

The tactile snap feel is governed by the collapse of the thin silicone web angled at $40^\circ - 50^\circ$. Actuation snap ratio is calculated by:

Snap Ratio = ((F1 - F2) / F1) * 100%

Target a snap ratio of $50\% - 60\%$ for crisp feedback without excessive tensile strain on the webbing hinges.