SIKAFLEX 268
Harmonization Code : 3907.30.00.40 | Epoxy Mold Compounds containing by weight more than 70 % silicon dioxide
Main features
- Accelerated Cure Process Option
- Rail Cleaning-Agent Resistance
- Exterior Rail Glazing and Assembly
Product Description
Sikaflex-268 is a one-component, moisture-curing polyurethane adhesive and sealant for rail assembly, direct glazing, and repair bonding. It can be processed conventionally or accelerated with Sika Booster and PowerCure systems, while the non-sag material provides a 40-minute open time at 23 deg C and 50% relative humidity. The cured material has 6 MPa tensile strength, 500% elongation, and 4.5 MPa tensile lap-shear strength under ISO 527 and ISO 4587. Its weathering stability and resistance to specified rail cleaning agents support exterior rail joints when dilution, exposure time, and rinsing follow the cleaning-agent guidance.
Key features
- Accelerated cure option: Processing can be accelerated with Sika Booster and PowerCure systems
- Rail cleaning-agent resistance: Resistance applies when dilution, exposure time, and rinsing follow the product guidance
- Exterior rail performance: Weathering stability supports assembly and glazing in exterior rail joints
Applications
Rail and commercial-vehicle assembly; direct glazing; repair bonding; exterior rail joints.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Mechanical Properties
Thermal Properties
Additional Information
As-supplied / before-processing properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Chemical base | 1-component polyurethane | As supplied | |
| Color | Black | CQP001-1 | |
| Density | 1.3 | kg/l | Uncured |
| Non-sag properties | Very good | CQP061-1 | |
| Application temperature | 5 to 40 | deg C | Product and ambient range |
| Skin time | 60 | minutes | CQP019-1; 23 deg C / 50% RH |
| Open time | 40 | minutes | CQP526-1; 23 deg C / 50% RH |
| Shelf life - unipack | 12 | months | Storage below 25 deg C |
After-processing / final-state properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Shrinkage | 1 | % | CQP014-1 |
| Hardness | 55 | Shore A | CQP023-1 / ISO 48-4 |
| Tensile strength | 6 | MPa | CQP036-1 / ISO 527 |
| Elongation at break | 500 | % | CQP036-1 / ISO 527 |
| Tear propagation resistance | 13 | N/mm | CQP045-1 / ISO 34 |
| Tensile lap-shear strength | 4.5 | MPa | CQP046-1 / ISO 4587 |
| Service temperature | -50 to 90 | deg C | CQP509-1 / CQP513-1 |
