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Product descriptiontesa® HAF 8401 is a reactive heat activated film based on phenolic resin and nitrile rubber. This amber double sided tape has no backing. It is protected by a strong paper liner and can easily be slit and die cut.
At room temperature tesa® HAF 8401 is not tacky. It is activated for pre-lamination by heat and starts to become tacky at 90 °C. In a second application step heat and pressure is applied over a certain period of time.
After curing tesa® HAF 8401 reaches:
1 Very high bonding strength
1 High temperature resistance
1 Excellent chemical resistance
1 Bonds remain flexible and elastic
Main applicationsIt is suitable for bonding of all thermal resistant materials such as metal, glass, plastic, wood and textiles.
1 High-strength splicing (overlap splice)
1 Structural bonding
1 Magnet bonding in electric motors
1 Friction liners for clutches
Shelf life time < 25°C
Shelf life time (packed) < 15°C
Type of adhesive
nitrile rubber / phenolic resin
Shelf life time < 15°C
Type of liner
Shelf life time (packed) < 5°C
Bonding strength (dynamic shear)
Shelf life time < 5°C
Shelf life time (packed) < 25°C
tesa® HAF 8401 is laminated before curing. For this process we recommend a temperature between 120 °C and 140 °C.
The bonding conditions temperature, pressure and time depend on the application. Following parameters can be regarded as a guideline:
1 Temperature: 120-220 °C
1 Time: 15 – 90 s.
Friction liners for clutches:
1 Temperature: 180 – 230 °C
1 Pressure: > 8 bar
1 Time: 3 min – 30 min
1 Temperature: 140 – 180 °C
1 Pressure: > 6-10 bar
1 Time: 2 min - 5 min
1 Temperature: 180 – 220 °C
1 Pressure: > 10-15 bar
1 Time: > 3 - 30 min
Bonding strength values were obtained under standard laboratory conditions. Value is guaranteed clearance limit checked with each production batch (Material: Etched aluminium test specimen / Bonding conditions: Temp. = 120 °C; p = 10 bar; t = 8
To reach maximum bonding strength surfaces should be clean and dry. Storage conditions according to tesa® HAF shelf life concept.
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.