tesa HAF® 8478

200 µm / 7.9 mils amber reactive structural bonding film

Product Features

Extremely high performance, even on small bonding areas and thin design gaps
Reliable and ageing-resistant bonds
Very low oozing ratio

All product features

Product description

tesa HAF® 8478 is a reactive heat activated structural bonding film based on phenolic resin and nitrile rubber. This amber double sided tape has no backing. It is protected by a strong paper liner. It is activated by heat and pressure applied during the assembly process.

Product details and specifications

Product Features

Extremely high performance, even on small bonding areas and thin design gaps
Reliable and ageing-resistant bonds
Very low oozing ratio
Suitable for long-term applications that are exposed to heavy stress
Free of halogen and compliant with current ROHS standards

Application Fields

tesa HAF® 8478 is especially recommended for bonding of metal components to metal surfaces or heat resistant plastics, e.g. SUS or AL to PI, PMMA or ABS:

Constructive bonding inside electronic devices
FPC bonding
Button fixation
Camera lens and bezel mounting
Bonding of decorative metal components

Adhesive Type	nitrile rubber / phenolic resin
Backing material	none
Color	amber
Liner Type	glassine
Total thickness	7.87 mils 200 µm

Adhesive Type	nitrile rubber / phenolic resin
Backing material	none
Color	amber
Liner Type	glassine
Total thickness	7.87 mils 200 µm

Bonding strength (push-out)	1595.42 lbs/in² 11 N/mm²

Bonding strength (push-out)	1595.42 lbs/in² 11 N/mm²

Technical recommendations: tesa HAF® 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, the adhesive tape is laminated onto the first substrate. This step does not affect the shelf life time of the adhesive tape. Pre-laminated components can be stored over the same period of time as the adhesive tape.
setting:

Temperature¹: 95-120 °C (203-248 °F)
Pressure²: 2-6 bar
Time: 3-10 s

2. Bonding: Remove the liner from tape after pre-lamination step. Place the pre-laminated part onto the second substrate. Apply sufficient temperature while applying pressure for the bonding time to reach sufficient bonding strength.
setting:

Temperature¹: 120-250 °C (248-482 °F)
Pressure²: 5-30 bar
Time: 5-180 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. To achieve optimum performance a cooling step (while applying pressure) directly after the bonding step is recommended. 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 transformed from jig surface directly to the bonding area. Bonding strength values were obtained under standard laboratory conditions. (Material: etched aluminum test specimen / bonding conditions: temperature = 180 °C / 356 °F; pressure = 10 bar; time = 7 sec). 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.

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