HMI Touch Panel & Protection Film : Materials & Care Guide

Reference products: CommandHMI, part umber HMI-xxx

Products composition:

KD Touch KDT-8656 (4-wire resistive touchpad) which is not physically accessible by the user
In addition to the KD Touch, there is an EBG250 PET protective film

< ! > We are not referring here to the additional removable screen film

Protection Film (EBG250 PET)

A high-clarity, hard-coated polyester (PET) film used as the top protective/overlay layer:

Property	Value
Base material	PET (polyester film)
Surface finish	Glossy, single-side hard coating
Standard thickness	250 µm
Optical transmittance	≥ 90%
Surface hardness	2H (pencil hardness)
Chemical resistance	Resistant to a wide range of chemical agents
Mechanical properties	High flexibility, fold/crack resistant, suitable for embossing/forming

Typical use: overlay for membrane switches, touch display fronts, control panels, and nameplates.

Only use isopropyl alcohol (IPA) with a soft, lint-free cloth to remove dirt, fingerprints, or smudges from the touch surface.
Do not use any solvent other than alcohol (no acetone, thinners, ketones, or general household cleaners) – these can damage the coating or adhesive layers.
Apply alcohol sparingly: avoid letting liquid seep into the seam between the film and the glass, as this can weaken the adhesive bond and cause delamination or malfunction.
Never allow the panel to contact water, organic solvents, acids, or sulfuric compounds.
Wear clean gloves/finger cots when handling panels to avoid fingerprints and, on Film+Glass types, to protect against the unpolished glass edges.
Store panels away from direct sunlight, heat, and pressure; keep original packaging intact until installation.
If an additional protective film is added, note that this may alter the panel’s original optical or operating performance – this effect is not covered by the manufacturer’s warranty.