tesa HAF® 8444

Technical recommendations: tesa® Thermoplastic HAF 8444 is not self adhesive. It is activated by heat while applying slight pressure.

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: 90–130 °C
• Pressure²: 2–5 bar
• Time: 2–5 s.

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

Setting:

• Temperature¹: 115–140 °C
• Pressure²: 2–5 bar
• Time: 5–15 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 mould surface directly to the bonding area.

Bonding strength values were obtained under standard laboratory conditions (Material: AL & PC test specimen / Bonding conditions: Temperature = 140 °C; Pressure = 5 bar; Time = 7 sec).

To reach maximum bonding strength surfaces should be clean and dry. Storage conditions according to tesa® HAF shelf life concept.