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Product information

tesa® XPU 8702

50µm x-linkable polyurethane translucent HAF mounting tape



Product description

tesa® XPU 8702 is a reactive mounting tape offering high bonding strength and elasticity after curing. This translucent double-sided tape has no backing. It is protected by a PE-coated paper liner.

tesa® XPU 8702 is free of halogen according to IEC 61249-2-21 and compliant with current RoHS directive.

At room temperature tesa® XPU 8702 is not tacky. It is activated by heat and pressure applied during the assembly process.

Special features:
  • Extremely high bonding performance and reliability, even on thin design gaps
  • Excellent shock resistance
  • Extremely low oozing ratio
  • Translucent design

Main applications

tesa® XPU 8702 is especially recommended for structural bonding of various substrates inside electronic devices:
  • Bonding of plastics
  • Bonding of metals
  • Bonding of electronic components

Additional Info

Technical recommendations:
tesa® XPU 8702 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 adhesive tape onto the first component.

Setting:
  • Temperature¹ 55-65 °C
  • Pressure² 3 bar
  • Time 5 – 20 s
Short-time exposure to 65 °C bond line temperature during pre-lamination does not impact final bonding potential.

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

2.1. PC/PC:
Setting:
  • Temperature¹ 80 – 140 °C
  • Pressure² 5 bar
  • Time 10 – 120 s

2.2. AL/PC:
Setting:
  • Temperature¹ 110 – 190 °C
  • Pressure² 5 bar
  • Time 20 – 120 s

Short cycle times can be achieved at high bond line temperatures. For activation at low temperatures, increase the heat-press time. 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.

Bonding strength values were obtained under standard laboratory conditions.
(PC/PC: bonding conditions: temperature = 110 °C (120°C jig); pressure = 5 bar; time = 60 sec / AL/PC: bonding conditions: temperature = 170 °C (180°C jig); pressure = 5 bar; time = 20 sec.)

Storage: tesa® recommends storage in original packaging in cool and dry conditions.

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.

Technical properties

Type of adhesive

crosslinkable polyurethane

Total thickness

50 µm

Backing material

none

Bonding strength (push-out)

3 N/mm²

Type of liner

PE-coated paper

Color

translucent

tesa® products prove their impressive quality day in, day out in demanding conditions and are regularly subjected to strict controls. All technical information and data above mentioned are provided to the best of our knowledge on the basis of our practical experience. They shall be considered as average values and are not appropriate for a specification. Therefore tesa SE can make no warranties, expressed or implied, including, but not limited to any implied warranty of merchantability or fitness for a particular purpose. The user is responsible for determining whether the tesa® product is fit for a particular purpose and suitable for the user’s method of application. If you are in any doubt, our technical staff will be glad to support you.

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