The thickness of the cover glass depends on impact protection requirements and general mechanical requirements. Cover lens thickness is chosen among specific thickness series. The recommended thickness values are 0,55mm, 0.7mm 1.1mm 1.8mm 3mm and 4mm.
It is worth to distinguish cover glass thickens to total touch sensor thickness.
In the example on the right, we have a 4mm CG, but the sensor and the SCA (Solid Clear Adhesive – dry optical bonding) is 1.1mm+0.25, so total thickness in the display area (where we touch) is 5.35mm.
It’s especially important when we have thin CG like 0.7 or 1.1mm, if we have 0.7mm CG and 0.55 sensor, with 0.15mm glue, we actually have 1.4mm in display area, so double CG which change mechanics completely. Understanding this fact is important from durability point of view.
If your project requires thicker glass, feel free to contact us. WHycon, Ilitek, EETI, PenMount), which can support cover glass up to 15 mm of thickness.