OCA: Optically clear adhesive tapes as a reliable bonding solution for applications on PMMA and PC

Transparent pressure-sensitive adhesive tapes for bubble-free lamination and bonding of printed electronics and capacitive touch sensors

The challenge with OCA tape applications is to avoid the forming of air bubbles between material and tape during and after the application process. In the entire application set-up, air bubbles have a negative impact on the function of touch sensors and printed electronics.

Our optically clear adhesive tape solutions enable secure lamination and mounting in a wide field of printed electronics applications, and also in touch sensors in human machine interface (HMI) applications. They are particularly suitable for bonding applications on moisture-outgassing plastics such as PMMA or PC. In addition to their permanently high transparency, the adhesive tapes are acid-free and enable a bubble-free appearance at temperatures of up to 105 °C. They are also excellent for encapsulating the print edges of the most common screen printing inks.

The most important application fields:

Lamination of printed electronics and assembly on plastic components
CG_HomeAppliances_Front_Panel_Oven_2102_PNG_600 (RGB).png

Bonding of printed overlay films on HMI devices
CG_HomeAppliances_Electronics_Front_Panel_Display_Ofen_Glas_2102_PNG_600 (RGB).png

Bubble-free bonding on moisture outgassing plastics

Our OCA solutions enable bubble free bonding after a temperature exposition of up to 105 °C:


1)  Substrate

  • Polycarbonate
    (optional: including corona pre-treatment)
  • Polymethylmethacrylate
    (optional: including corona pre-treatment)
  • Polyethylene


2)  Lamination

  • Fully or semi automatic
  • First on flexible, then to rigid substrate

 Icon_TM_Temperature_limitation_PNG_XS Office 800 (RGB).png 

3)  Conditioning

  • Autoclave
  • Recommendation:
    40-60 °C component temperature, 6 bar, > 20 min

Clearly recognizable in direct comparison - Lohmann's OCA solutions are ahead of conventional OCA adhesive tapes on the market.

Other optically clear adhesive tapes (as an example the upper sample in the illustration) cast clearly visible bubbles after exposure to temperature. These affect the optical brilliance and function of HMI interfaces. For example, the sensitivity of touch sensors is reduced, or the backlighting of buttons and the visual appearance of displays are less visible. In addition, the effect of temperature can reduce the transparency of the optically clear adhesive tape - in some cases, this can even lead to haze or yellowness of the product.

Lohmann's OCA tape (the lower sample in the illustration), on the other hand, remains bubble-free after exposure to temperature. There is no haze or yellowness of the product.


Conventional OCA tape (upper sample) vs. Lohmann OCA tape (lower sample)
after temperature exposure - direct comparison



Your advantages 

  • > 98 % optical transmission 
  • Low haze and yellowness index
  • Excellent resistance to moisture outgassing plastic substrates (polycarbonate / polymethylmethacrylate)
  • High durability under sunlight exposure without air bubble forming and yellowing
  • Long term durability at temperature exposure < 105 °C without air bubble forming and yellowing possible
  • Acid free and compatible to conductive inks
  • Good adaptability to print steps
  • Clean room practices converting and packaging possible

Product portfolio

Our OCA tapes are available in two thicknesses. They are equipped with a transparent polyester film liner and a highly transparent pure acrylic adhesive:

Product name Construction Liner Adhesive Thickness without liner [mm]
DuploCOLL® 26050 OC Double-sided transfer tape Polyester film, transparent Pure acrylic, highly transparent 0,05
DuploCOLL® 26150 OC 0,15


Product performance

General technical properties

Property* Method Substrate DuploCOLL® 26050 OC DuploCOLL® 26150 OC
Thickness [mm] internal Without 0,05 0,15
Peel adhesion 180°
[N/25 mm]


24h after bonding

Steel 20 25
Glass 20 25
PMMA 17 19
PC 17 19
Stat. shear adhesion 4 h
[N/625 mm²]
Steel 100 200
T-Peel 100 mm/min
[N/25 mm]
acc. to DIN EN ISO 11339 PET 16 23
Acid value [mg/gKOH] internal Without < 1 < 1
Temperature resistance 500 h, 105 °C Glass Transparency 99 %
Haze 0,6 %
Yellowness 0,6
Transparency 99 %
Haze 0,6 %
Yellowness 0,6
UV resistance 500 h, 0,35 W/m 340 nm 63 °C Transparency 99 %
Haze < 0,2 %
Yellowness 0,4
Transparency 99 %
Haze < 0,2 %
Yellowness 0,4


Optical properties

Property* Method DuploCOLL® 26050 OC DuploCOLL® 26150 OC
Thickness [mm] internal 0,05 0,15
Transmission rate [%]
(350-1000 nm)
ASTM D1003 > 98 > 98
Haze [%] < 1,0 < 1,0
Yellowness ASTM E313 < 0,2 < 0,2
Color L* ASTM E308, D65/10° 100 100
Color a* 0,0 0,0
Color b* 0,1 0,1
Air bubbles internal 0,2-0,5 mm max. 10/m² ≤ 0,15 mm max 100/m²
Particles ≤ 6,30 mm max 100/m²


*Data are average measurement data and not valid for specification.


Additional information


Technical datasheet DuploCOLL® 26050 OC**

Datasheet DuploCOLL 26050 OC EN.png

DuploCOLL 26050 OC TDS EN.pdf

Technical datasheet DuploCOLL® 26150 OC**

Datasheet DuploCOLL 26150 OC EN.png

DuploCOLL 26150 OC TDS EN.pdf

Usage instructions for OCA tapes

Usage instructions DuploCOLL 26xxx OC EN.png


Further information


The physical properties described in this data sheet are typical measured values or average measured values. All application-related assessments, information and recommendations are based on our best knowledge and practical experience. Many factors beyond our control are solely within the control of the purchaser and may influence the use and effects of our adhesive tapes in the specific application. Unless explicitly agreed in writing, we accept no liability for the suitability or usability of our tapes for specific purposes and applications, which are inherent in the specific use of the tapes by the purchaser. Unless otherwise stipulated by law, our liability for direct or indirect, material or immaterial damage to the purchaser resulting from the use of our adhesive tapes is excluded. The responsibility for the suitability for the purpose intended by the purchaser lies solely with the purchaser.