Blog

Compression set (≤5% for premium silicone) causes permanent rebound loss after prolonged compression. Prevent by requiring test reports, ensuring post‑cure (200°C×4h), specifying high‑grade materials, and adding initial height compensation. FromRubber validates long‑term resilience before silicone keypad production.

Prevent yellowing with amine‑free anti‑yellowing masterbatch, QUV testing (48h, ΔE≤2.0), and cure control. FromRubber validates color stability for white/light silicone keypad.

Reduce dust adhesion with internal antistatic agents (1–3%) — surface resistivity drops from 10¹⁴ to ≤10¹⁰Ω. Combine with PU coating for premium appearance. FromRubber ESD silicone keypad solutions.

Food‑contact silicone keypads require FDA (US) and LFGB (EU) certification. LFGB adds sensory odor/taste testing. Use certified base gums with full documentation. FromRubber ensures compliance.

Keep silicone keypad prints ≥0.5mm from parting lines. Use solid-core side walls, specify low flash, and run DFM reviews. FromRubber ensures silicone keypad crisp, aligned printing.

Add ≥2 locating holes (0.05–0.1mm clearance) to align conductive pills to PCB pads. Use anti-reverse design. FromRubber ensures silicone keypad 100% contact yield.

Deep‑draw silicone keypad (H/D > 0.6) risk tearing during demolding. Prevent by calculating draw ratio, increasing draft to 5–10°, enlarging R‑corners (≥R0.8), using high‑tear silicone (≥35 kN/m), and adding air‑assist ejection. FromRubber's DFM review validates demolding feasibility before tooling.

Prevent silicone keypad punctures and PCB damage by calculating escape height ≥ stroke + pill height + 0.2mm. Map all PCB component heights, add relief pockets for tall parts, and use travel limiters. FromRubber DFM review catches interference before tooling.

Silicone keypad tolerances typically range ±0.1–0.3mm due to cure, batch, and shrinkage variables. Assign ±0.1mm only to critical mating features; use ±0.2mm for general dimensions. Tiered strategy, written sign‑off, and DFM review prevent disputes. FromRubber guides realistic tolerance planning

Silicone keypad hardness (40–60A) must match stroke, R‑angle, and usage. Start at 50–55A for most projects. Higher hardness needs PU coating; lower hardness requires longer stroke. Temperature and lifespan affect choice. FromRubber provides DFM hardness recommendations.