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Double-Side TPU-Coated PET Film – Purpose-Built for Membrane Switch Manufacturing
For membrane switch producers, every layer matters. The PET substrate must hold fine screen-printed legends, survive repeated dome actuations, stay dimensionally stable through thermal lamination, and present a flawless optical surface - especially for backlit panels.
The HT-15 series double-side TPU-coated PET film addresses all these demands. By combining a premium PET core with functional TPU coatings on both sides, it delivers the adhesion, formability, and consistency that membrane switch production lines require.
Five Key Advantages for Membrane Switch Processing
1. Superior Ink Adhesion - Screen & UV Inks Stay Put
The dual TPU coatings dramatically improve anchor strength for both fine-mesh screen-printing and UV-curable inks.
Cross-Cutting Test: 100/100 Pass (JIS K5600) - no flaking, even after aggressive rubbing.
Ideal for symbols, borders, and functional legends that must survive millions of actuations and exposure to sweat, detergents, or oils.
2. Excellent Dome-Forming Performance - No Cracking, Consistent Tactile Feel
Elongation at Break: 154% (MD) / 110% (TD) - provides sufficient stretch for embossed dome formation without tearing.
Balanced mechanical properties ensure uniform dome height and good spring-back, giving end-users a crisp, consistent click feel.
With TD shrinkage near 0.0%, the HT-15 film minimizes transverse movement during printed circuit layer drying, spacer lamination, and overlay bonding. This drastically reduces misalignment between upper and lower circuit traces - a critical factor for electrical reliability in multi-layer membrane switches.
5. High Cleanliness with Dual Protective Liners - Minimized Surface Defects
Manufactured under strict cleanliness control to reduce pinholes, gels, and foreign particles that cause print white-spots.
Comes with green PE protective film (top, easy identification) and clear PE liner (bottom) - safeguards against scratches during storage, handling, and die-cutting.
Product Structure & Specifications
Tailored for Membrane Switch Lines
Structure
Green PE protection / Double-side TPU-coated PET / PE protection
Model
HT-15 Series
Thickness Options
100 μm (most common for membrane switches), 125μm, 188μm, 250μm
Standard Width
1020 mm
Standard Length
200 m/roll
Custom narrow slitting and special thicknesses available upon request.
Key Data Sheet - Membrane Switch Focus
Property
Unit
Typical Value
Standard
Relevance for Membrane Switches
Light Transmittance
%
≥92
JIS K7136
Uniform backlight brightness
Haze
%
<1.3
JIS K7136
Clear window areas
Heat Shrinkage (MD/TD)
%
1.0 / 0.0
JIS C2318
Accurate multi-layer registration
Tensile Strength (MD/TD)
MPa
163 / 180
ASTM D882
Punches cleanly without tearing
Elongation at Break (MD/TD)
%
154 / 110
ASTM D882
Dome stretching without cracks
Cross-Cutting Test
--
100/100 Pass
JIS K5600
Legends remain intact after wear
Primary Applications
Directly for Your Production Line
Home appliance membrane switches - washing machines, microwave ovens, AC panels
Medical device keypads - requiring sanitization resistance and reliable print
Smart home & remote controls - slim profiles with responsive domes
Backlit membrane switch modules - leveraging high transmittance for uniform glow
Important Processing Note
All technical data are typical laboratory values and not guaranteed specifications. We strongly recommend that membrane switch manufacturers run full pilot trials - covering screen-printing, curing, dome forming, and lamination - before mass production. Our technical team is available to assist with thickness selection and process parameter recommendations.
Upgrade Your Membrane Switch Quality - Order a Sample Today
Choose HT-15 PET film for sharper legends, more consistent domes, higher lamination yields, and fewer field failures.
Request a free sample or speak with our membrane switch application specialist - we understand your process and can help you select the right grade quickly.
