Product information

tesa® ACXplus 74508 Seal Line

0.8 mm heat activatable acrylic foam tape for mounting window seal and water box seal applications

Product description

tesa® ACXplus 74508 Seal Line is a deep black acrylic foam tape for permanent mounting of weather strips and water box seals, mainly on automotive glass. It has a heat-activatable adhesive on the non-liner side. The adhesive gets activated by hot air or near-infrared when applying it onto the PP/EPDM, PP, TPV, or TPE seal.

Compared to the conventional process with primer, tesa® ACXplus 74508 Seal Line ensures a highly secure bond to the rubber profile, enables a higher application speed than using primer, and realizes a more environmentally friendly production process.

Its outstanding cold shock resistance is based on a modified acrylic foam core, which assures a reliable bond even at extreme low temperatures. Being viscoelastic, tesa® ACXplus 74508 Seal Line absorbs and dissipates dynamic and static loads optimally. This exceptional capability enables tesa® ACXplus 74508 Seal Line to compensate for extreme physical stress caused by the different thermal elongation of bonded parts in rapidly changing temperatures.

The deep black color provides an enhanced appearance and high design flexibility.

Main features:

  • High stiffness is especially suitable for mounting water box profiles
  • Efficient and secure bonding of the heat-activatable layer to seals
  • Extremely high shear resistance
  • Strong bonding of the heat-activatable layer to backing that withstands humidity and heat
  • Closed cell acrylic foam core for reliable sealing to prevent water penetration
  • High humidity and UV resistance
  • Excellent cold shock performance

Main applications

tesa® ACXplus 74508 Seal Line can be widely used for mounting window seals, water box seals, sunroof seals, and obstacle detection systems (ODSs).


Technical properties

Backing material

foamed acrylic


deep black

Total thickness

840 µm

Type of adhesive to glass

modified acrylic

Type of adhesive to seal


Elongation at break

400 %

Tensile strength

30 N/cm

Adhesion properties

Adhesion to Glass (covered side, after 1 day)

56 N/cm

Adhesion to Glass (covered side, after 10 days, warm / humid*)

60 N/cm

Adhesion to Steel (covered side, after 3 days)

26 N/cm

Adhesion to TPE (T-Peel, after 1 day)

35 N/cm

Adhesion to TPE (T-Peel, after 10 days, warm / humid*)

40 N/cm

Rating properties

Ageing resistance (UV)


Humidity resistance


Cold-shock resistance






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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