tesa® LTT 8741

Adhesion properties:
Peel adhesion to polyester fabric: 7 N/cm
Technical recommendations:
tesa^® LTT 8741 is not self-adhesive. It is activated by heat and pressure over a certain interval. The following values are recommendations for bond line parameters to start with.
1) Pre-lamination
During pre-lamination, laminate the film onto the first component.
Setting:

• Temperature¹ 60 – 90 °C
• Pressure² 1 – 5 bar
• Time 5 – 20 s

2) Bonding
Remove the liner from the film after the pre-lamination step. Position the second component. Apply temperature and pressure for the bonding time to reach sufficient bonding strength.
Setting:

• Temperature¹ 80 – 120 °C
• Pressure² 1 – 5 bar
• Time 10 – 480 s

Temperature, pressure and time will depend upon the type and thickness of the substrates. Generally, thicker substrates or lower bonding temperatures will require longer bonding times.
Short cycle times can be achieved at 110 °C bond line temperature. For activation at lower temperatures, increase the heat-press time or combine a short heat-press step with oven curing.
Peel adhesion values were obtained under standard laboratory conditions (reinforcement backing 23 µm PET; bonding conditions: temperature = 90 °C; pressure = 5 bar; time = 120 sec).
To reach maximum bonding strength, surfaces should be clean and dry. Allow at least 1-2 hours dwell-time after bonding before performance testing. Final bonding strength will be reached after 24 hours.

¹ ‘Pre-lamination’ and ‘Bonding’ temperature refer to the data that is measured in the bond line. ² ‘Pre-lamination’ and ‘Bonding’ pressure refer to the force that is transferred from jig surface directly to the bonding area.