Sikaflex®-556 is a cold-applied, isocyanate and solvent-free windshield adhesive. It meets the standards for original factory glazing and aftermarket applications.
Sikaflex®-556 has been tested according FMVSS 212.
- Free of isocyanates, solvents, PVC and silicones
- Suitable for most car makes and models
- Tested according FMVSS 212 standard
Free of isocyanates, solvents, PVC and silicones
Suitable for most car makes and models
Tested according FMVSS 212 standard
Areas of ApplicationSikaflex®-556 has been specially designed for the Automotive Glass Replacement business. It is suitable for windshield replacement as well as for applications in the transportation OEM industry.
Sikaflex®-556 is suitable for experienced users only.
This product and related process information is designed for Automotive Glass Replacement. For other applications, tests with actual substrates and conditions have to be performed ensuring adhesion and material compatibility.
Silane Terminated Polymer
|Non-sag properties (CQP061-1)|
5 ─ 35 °C
5 ─ 35 °C
|Skin time (CQP019-1)|
15 minutes A
|Open time (CQP526-1)|
10 minutes A
|Curing speed (CQP049-1)|
See diagram 1
|Shore A hardness (CQP023-1 / ISO 7619-1)|
|Tensile strength (CQP036-1 / ISO 527)|
|Elongation at break (CQP036-1 / ISO 527)|
|Tear propagation resistance (CQP045-1 / ISO 34)|
|Tensile lap-shear strength (CQP046-1 / ISO 4587)|
|Shear modulus (CQP081-1)|
|Safe Drive Away Time (cars) according FMVSS 212 (CQP511-1)|
2 hours A/B
1 hour A/B
|Insulation resistance (CQP079-2 / DIN IEC 60167)|
|Shelf life (CQP016-1)|
12 months C
CQP = Corporate Quality Procedure
A) 23 °C / 50 % r. h.
B) Details about SDAT contact Sika
C) storage below 25 °C
Sikaflex®-556 cures by reaction with atmospheric moisture. At low temperatures the water content of the air is generally lower and the curing reaction proceeds somewhat slower (see diagram 1).
Diagram 1: Curing speed
Sikaflex®-556 is generally resistant to fresh water, seawater, diluted acids and diluted caustic solutions; temporarily resistant to fuels, mineral oils, vegetable and animal fats and oils; not resistant to organic acids, glycolic alcohol, concentrated mineral acids and caustic solutions or solvents.
Surfaces must be clean, dry and free from grease, oil, dust and contaminants.
The bond faces must be treated according Sika's Black-Primerless (only with Sika®Aktivator PRO or Sika®Aktivator-205) or All Black installation process. Further information on the application and use of Pre-treatments, can be found in the corresponding Product Data Sheet.
Windshields without ceramic coatings need proper UV protection.
It is recommended to apply Sikaflex®-556 with a battery operated or air powered piston-type application gun.
Consider the viscosity increase at low temperature. For easy application, condition the adhesive at ambient temperature prior to use.
To ensure a uniform thickness of the bondline it is recommend to apply the adhesive in form of a triangular bead (see figure 1).
Figure 1: Compressing adhesive bead to final size
The open time is significantly shorter in hot and humid climate. The glass must always be installed within the open time. Never install a glass after the product has built a skin.
Uncured Sikaflex®-556 can be removed from tools and equipment with Sika® Remover-208 or another suitable solvent. Once cured, the material can only be removed mechanically.
Hands and exposed skin have to be washed immediately using hand wipes such as Sika® Cleaner-350H cleaning towels or a suitable industrial hand cleaner and water. Do not use solvents on skin!