WHITE PAPER
NEW RELEASE
SikaForce®-821 L06 FOR SPOILER BONDING

Figure 1 Bonded Spoiler

Copyright of Covestro AG

EXECUTIVE SUMMARY
SikaForce® adhesives are leaders in the market and are specialized in spoiler bonding applications. For
many substrates like polycarbonate and its blends (e. g. PC ABS, PC PET), that are widely used forautomotive and exterior components, a physical activation of the bonding area is needed to ensure along-term stable bond. Even if in-line activation processes with atmospheric plasma are possible, they
typically lead to additional invests and influencing factors, therefore Sika is proud to introduce the next
generation of SikaForce® that allows adhesion without physical activation on given substrates.
SikaForce®-821 L06 is our newcomer and specialist for PC bonding.

ADVANTAGES AT A GLANCE•

Very fast processes can be achieved with heat acceleration – Curing-On-Demand (COD)•Superior sagging behavior allows for high applicable bead thicknesses and a remarkable
tolerance compensation•

Very good adhesion on polycarbonate and its blends (e. g. PC ABS, PC PET) without pretreatment•Absence of plasticizer in the formulation avoids this risk of Environmental Stress Cracking (ESC)and bond line read through / marking•Easy to handle

KEY DATA

2PROPERTIESTYPICAL VALUES

Mixing ratio (by volume)

2:1

Tensile strength

4,8 MPa

Elongation at break

450 %E-Modulus (0,5 – 5 %)5,9 MPa

Tensile lap-shear strength

3,2 MPaOpen time at (23 °C / 50 % r. h.)

5 min.

Open time at (35 °C / 50 % r. h.)

3 min.

ADHESION RANGE
Bead peel testing is a proven and meaningful instrument to assess the adhesion behavior andconsequently, qualifying an adhesive for a specific project and application.
RESULTS BEAD PEEL TESTS
PC (Makrolon® AX2675) – without physical activation

PC ABS (Bayblend® T85 XF) – without physical activation

PC PET (Makroblend® UT235 M) – without physical activation

The bead peel test results above (tested before and after common OEM ageing simulations) display
fracture patterns demonstrating how stable and reliable adhesion can be obtained with SikaForce®821 L06 without any physical activation process of the substrates. This offers leaner substratepreparation and bonding processes on important spoiler materials and other components made of PC
blends.

3STRENGTH BUILD-UP PERFORMANCEHEAT ACCELERATION

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Lap-shear strength [MPa]Lap-shear strength [MPa]ROOM TEMPERATURE CONDITIONS

32
10

1h2h

4h

6h8h24 hTime after joining at 23 °C

Handling-strength reached within 60 min. at23 °C ambient conditions

43
2
100,5 min.

1 min.

1,5 min.

2 min.

Cooling-down time at 23 °C after 1,5 min. COD

With heat input (1,5 min. COD), handlingstrength can be reached within 2 min. totally

Spoiler bonding processes are typically driven by short cycle times. In many cases, a heat accelerationof the adhesive is mandatory to achieve a certain level of handling strength of the bonded parts for thedownstream processes. In this context, the effectivity of the heat acceleration on the strength buildup of the adhesive is a crucial lever and enabler for efficient bonding processes.
With heat acceleration (COD), strength values > 1 MPa can be achieved within 3 min. Very fast bonding
processes can be ensured with SikaForce®-821 L06.

4OUTLOOK
We propose SikaForce®-821 L06 for spoiler bonding applications and other component bonding
applications, wherever stable and long-term resistant adhesion on PC grades and its blends is required.
Let’s keep in touch and please join us for writing new success stories with a new generation ofSikaForce® for spoiler bonding.

Gerrit Lang
Product Manager
Assembly Line Adhesives
Supporting spoiler, liftgate
and glass bonding solutions
For more details on Sika solutions for Automotive contact us or visit our website
www.sika-automotive.com
LEGAL NOTE
The information, and, in particular, the recommendations relating to the application and end-use of Sika products, are given in good faith
based on Sika's current knowledge and experience of the products when properly stored, handled and applied under normal conditions inaccordance with Sika’s recommendations. in practice, the differences in materials, substrates and actual site conditions are such that nowarranty in respect of merchantability or of fitness for a particular purpose, nor any liability arising out of any legal relationshipwhatsoever, can be inferred either from this information, or from any written recommendations, or from any other advice offered. Theuser of the product must test the products suitability for the intended application and purpose. Sika reserves the right to change theproperties of its products. The proprietary rights of third parties must be observed. All orders are accepted subject to our current termsof sale and delivery. Users must always refer to the most recent issue of the local Product Data Sheet for the product concerned, copies
of which will be supplied on request.

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