tesa_HAF-amber_dr_001
Product information

tesa® HAF 8474

Heat Activated Film
Solutions for the Consumer Electronics Industry



Product description

tesa® HAF 8474 is a thermosetting film based on phenolic resin and nitrile rubber. This brown double-sided tape has no backing. It is protected by a strong paper liner.

tesa® HAF 8474 is free of halogen and compliant with current ROHS standards.

At room temperature tesa® HAF 8474 is not tacky. It is activated by heat and pressure during defined intervals.

tesa® HAF 8474 enables extremely strong and ageing-resistant bonds between different materials.

tesa® HAF 8474 features especially:
  • Excellent conformability for flat and narrow substrate surfaces
  • Produces very low oozing ratio
  • Reliable and ageing-resistant bonds between plastic and metal surfaces, even on very small bonding areas
  • Suitable for long-term applications that are exposed to heavy stress
  • Bonds remain elastic

Main applications

tesa® HAF 8474 is especially recommended for bonding of metal components to various plastic or metal surfaces, e.g. SUS or AL to PMMA, PC or ABS:

  • Bonding of window frames and front covers of mobile phone housings
  • Constructive bonding inside handhelds
  • Multi media card applications

Technical properties

Bonding strength

7 N/mm²

Type of adhesive

nitrile rubber / phenolic resin

Type of liner

glassine

Total thickness

100 µm

Backing material

none

Colour

amber

Additional Info

Technical recommendations:
tesa® HAF 8474 is not self adhesive. It is activated by heat and pressure over a certain interval. The following values are recommendations for machine parameters to start with.

1. Pre-lamination:
During pre-lamination, the adhesive tape is laminated onto the metal 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.

Machine setting:
  • Temperature¹ 90 – 120 °C
  • Pressure² 2 – 6 bar
  • Time 1,5 – 3,0 s

2. Bonding:
Remove the liner from tape after pre-lamination step. Place the plastic part onto the metal component. Apply sufficient temperature through the metal part while applying pressure for the bonding time to reach sufficient bonding strength.

Machine setting:
  • Temperature¹ 180 – 220 °C
  • Pressure² 2 – 10 bar
  • Time 3,0 – 10,0 s

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 at the surface of heating mould.
² ‘Pre-lamination’ and ‘Bonding’ pressure refer to the force that is transformed from mould surface directly to the bonding area.

Storage conditions according to tesa® HAF shelf life concept.

Note: Bonding strength values (mean values) were obtained under standard laboratory conditions. (Material: AL & AL test specimen / Bonding conditions: Temperature = 180 °C; Pressure = 10 bar; Time = 7 sec).

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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