tesa_HAF-amber_dr_001
Product information

tesa HAF® 8474



Product description

tesa HAF® 8474 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.

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 applied during the assembly process.

Special Features:

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

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

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 bond line 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.

setting:
  • Temperature¹ 95-120 °C
  • Pressure² 2-6 bar
  • Time 3-10 s

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

setting:
  • Temperature¹ 120-250 °C
  • Pressure² 5-30 bar
  • Time 5-180 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 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; 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.

Technical properties

Backing material

none

Color

amber

Total thickness

100 µm

Type of adhesive

nitrile rubber / phenolic resin

Type of liner

glassine

Bonding strength

7 N/mm²

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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