Sikaflex®-271 PowerCure
Accelerated glazing adhesive
Sikaflex®-271 PowerCure is an accelerated elastic polyurethane adhesive for glazing and vehicle-glass-replacement applications. Suitable for bonding materials relevant for direct glazing such as paints, glass, ceramic frits, painted and e-coated surfaces in commercial-vehicle production and repair. Curing of Sikaflex®-271 PowerCure is accelerated by Sika’s PowerCure technology which makes it largely independent of atmospheric conditions.
- Accelerated curing and adhesion build-up
- Excellent application properties
- Ideal for glass replacement in commercial vehicles
- Low climate dependency of the curing speed with Sika® Booster
- High mechanical strength
- Solvent-free
PRODUCT BENEFITS
- Accelerated curing and adhesion build-up
- Excellent application properties
- Ideal for glass replacement in commercial vehicles
- Low climate dependency of the curing speed with Sika® Booster
- High mechanical strength
- Solvent-free
Areas of Application
Sikaflex®-271 PowerCure is designed especially for manual direct-glazing application and vehicle-glass replacement in commercial vehicles. Thanks to the PowerCure Technology Sikaflex®-271 PowerCure exhibits a fast strength and adhesion build-up. This product is suitable for experienced professional users only. Test with actual substrates and conditions have to be performed to ensure adhesion and material compatibility.Product Details
| Chemical base | Polyurethane | |
| Color (CQP001-1) | Black | |
| Cure mechanism | Moisture-curing A | |
| Density (uncured) | 1.2 kg/l | |
| Non-sag properties (CQP061-1) | Very good | |
| Application temperature | 5 ─ 40 °C | |
| Open time (CQP526-1) | 10 minutes B | |
| Early tensile lap-shear strength (CQP046-1 / ISO 4587) | See table 1 | |
| Shore A hardness (CQP023-1 / ISO 48-4) | 65 | |
| Tensile strength (CQP036-1 / ISO 527) | 7 MPa | |
| Elongation at break (CQP036-1 / ISO 527) | 300 % | |
| Tear propagation resistance (CQP045-1 / ISO 34) | 10 N/mm | |
| Tensile lap-shear strength (CQP046-1 / ISO 4587) | 5 MPa | |
| Service temperature (CQP509-1 / CQP513-1) | -40 ─ 90 °C | |
| Shelf life | 9 months |
CQP = Corporate Quality Procedure A Provided by PowerCure B 23 °C / 50 % r.h.
CURE MECHANISM
Sikaflex®-271 PowerCure cures by reaction with moisture provided by the accelerator paste and largely independent from atmospheric moisture. For typical strength build up data see table below.
| Time [h] | Tensile lap-shear strength at 23 °C [MPa] |
| 1 | 0.7 |
| 2 | 3.5 |
Table 1: Strength build-up of Sikaflex®-271 PowerCure
CHEMICAL RESISTANCE
Sikaflex®-271 PowerCure 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.
Application
Surface preparation
Surfaces must be clean, dry and free from grease, oil and dust. Surface treatment depends on the specific nature of the substrates and is crucial for a long lasting bond. All pre-treatment steps must be confirmed by preliminary tests on original substrates considering specific conditions in the assembly process.
Application
Setup the PowerCure Dispenser according to the PowerCure User Manual. If the application is discontinued for more than 2 minutes, the mixer needs to be replaced.
Sikaflex®-271 PowerCure can be processed between 5 °C and 40 °C but changes in reactivity as well as application properties need to be considered. The optimum temperature for substrate and adhesive is between 15 °C and 25 °C.
The open time is significantly shorter in hot and humid climate. The parts must always be joint within the open time. As a rule of thumb, a change of + 10 °C reduces the open time by half.
To ensure a uniform thickness of the bondline it is recommended to apply the adhesive in form of a triangular bead (see figure 1).
Figure 1: Recommended bead configuration
Removal
Uncured Sikaflex®-271 PowerCure 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 or a suitable industrial hand cleaner and water. Do not use solvents on skin.