tesa® 8694

tesa® L-tape is a reactive adhesive. It is activated by light at a wavelength of 365 nm or 460 nm. tesa® L-tape can be used for bonding of translucent or opaque substrates.
Bonding of opaque substrates
The open time of tesa® L-tape enables the bonding of opaque substrates like plastics and metals. tesa® L-tape can be activated by light as an die-cut or already pre-laminated onto the first substrate.
Activation of pre-laminated parts: First remove the covering liner of tesa® L-tape and pre-laminate the tape onto the first substrate. The pre-laminated parts are then exposed to light. The second substrate is bonded by applying sufficient pressure (≥3 bar) within 5 min after activation.
Activation of die-cuts: First the die-cut of tesa® L-tape is activated by light. The covering liner of the die-cut must be light-permeable (e.g., clear PET) to enable the activation of the tape. After activation the die-cut is pre-laminated onto the first substrate. The second substrate is then bonded by applying sufficient pressure (≥3 bar). Pre-lamination and bonding must take place within 5 min after activation.
Bonding of translucent substrates
Translucent substrates such as clear plastics can be bonded before activation by light. At least one substrate must be light-permeable to enable the activation of tesa® L-tape. First remove the covering liner of tesa® L-tape and pre-laminate the tape onto the first substrate. The second substrate is then bonded by applying sufficient pressure (≥3 bar). The bonded parts are then exposed to light to start curing of the adhesive.
Pre-lamination conditions
Before curing tesa® L-tape has initial tack and can be pre-laminated like a common PSA tape A pressure of ≥1 bar should be applied to ensure proper wet-out to the surface
Bonding and curing conditions

• Light source: Lamp of 365 nm or 460nm
• Light dose: 20 - 50 J/cm² at 365 nm or 30 - 60 J/cm² at 460nm
• Activation time: ≥30 s
• Pressure: ≥3 bar
• Bonding time: ≥30 s

Bonding strength values were obtained under standard laboratory conditions. (Material: PC test specimen / bonding conditions: Light dose: 52 J/cm² at 460 nm; activation time: 45 s; pressure: 5 bar for 30 s). To reach maximum bonding strength surfaces should be clean and dry.