Tesa 69401 – 25µm optically clear transfer tape

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25µm optically clear transfer tape

Tesa 69401 is a highly transparent transfer tape produced under controlled clean room conditions and designed for optically clear lamination.

Special features:

  • High transmission and low haze
  • Excellent temperature, humidity and UV resistance
  • Excellent whitening resistance
  • Excellent ITO compatibility (acid free)
  • Very good bubble stability (outgassing of plastic substrates)
  • High bonding strength
  • Balanced lamination (gap filling) and converting performance
  • Smooth and easy liner removal

Main applications

  • Optically clear lamination of films to rigid or flexible substrates especially in capacitive type touch panels
  • Bonding of flexible touch panels to protective cover or lens
  • Lamination of optical films, e.g. display protection and anti-splinter films

Technical properties

Total thickness 25 µm
Type of adhesive pure acrylic
Transmittance (380 – 780nm) > 99 %
Haze < 0.5 %
Refractive index 1.48

Adhesion properties

Adhesion to Glass (after 14 days) 6.6 N/cm
Adhesion to Glass (initial) 5.4 N/cm
Adhesion to PC (after 14 days) 7 N/cm
Adhesion to PC (initial) 5.9 N/cm
Adhesion to PET (after 14 days) 5 N/cm
Adhesion to PET (initial) 4.1 N/cm
Adhesion to PMMA (after 14 days) 6.6 N/cm
Adhesion to PMMA (initial) 5.8 N/cm
Adhesion to Steel (after 14 days) 6.6 N/cm
Adhesion to Steel (initial) 5.2 N/cm
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