SikaPower®-1277
Toughened and high impact-resistant 2-component structural adhesive
SikaPower®-1277 is a structural 2-component epoxy adhesive, which cures at room temperature. It is designed for high strength and impact-resistant bonding of metallic substrates, like steel and aluminum, as well as of composite substrates, like GFRP and CFRP laminates. The adhesive has good non-sag properties and contains glass beads of 0.3 mm to ensure an optimal bonding thickness.
- High structural and high impact-resistant properties
- Contains anti-corrosion agents
- Contains glass beads to ensure an optimal bonding thickness
- Does not contain solvents or PVC
- Cures at room temperature
- Accelerated curing and higher mechanical strength with heat
PRODUCT BENEFITS
- High structural and high impact-resistant properties
- Contains anti-corrosion agents
- Contains glass beads to ensure an optimal bonding thickness
- Does not contain solvents or PVC
- Cures at room temperature
- Accelerated curing and higher mechanical strength with heat
Areas of Application
SikaPower®-1277 is suitable for structural bonding applications in transportation and general industry. It can also be used for repair applications in combination with spot welding, riveting or clinching. The product is applied as contact adhesive (2-side application). In case of single bead application contact Sika.This product is suitable for professional experienced users only. Test with actual substrates and conditions have to be performed ensuring adhesion and material compatibility.
Product Details
| Properties |
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| Chemical base |
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| Color (CQP001-1) |
mixed |
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| Density |
mixed (calculated) |
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| Mixing ratio | A:B by volume A:B by weight | 2:1 2:1 | |||
| Viscosity (CQP029-4) | at 10 s-1 |
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| Consistency | Thixotropic paste | ||||
| Application temperature | 15 ─ 35 °C | ||||
| Open time (CQP046-11 / ISO 4587) | as contact adhesive | 1 hour B, C, D | |||
| Handling time (CQP046-11 / ISO 4587) | 11 hours C, D | ||||
| Curing time (CQP046-9, ISO4587) | time to reach 20 MPa | 24 hours C, D | |||
| Shore D hardness (CQP023-1 / ISO 48-4) | 75 C, E | ||||
| Tensile strength (CQP543-1 / ISO 527) | 30 MPa C, E | ||||
| E-Modulus (CQP543-1 / ISO 527) | 2 000 MPa C, E | ||||
| Elongation at break (CQP543-1 / ISO 527) | 4 % C, E | ||||
| Tensile lap-shear strength (CQP046-9 / ISO 4587) | 28 MPa C, D, E | ||||
| Impact peel strength (CQP505-1 / ISO 11343) | 30 N/mm C, D, E, F | ||||
| Glass transition temperature (CQP509-1 / ISO 6721) | 67 °C E | ||||
| Shelf life | cartridges pails | 24 months G 12 months G |
| CQP = Corporate Quality Procedure | A) tested at 20 °C | B) applied on both bonding surfaces |
| C) 23 °C / 50 % r. h. | D) adhesive layer: 25 x 10 x 0.3 mm / on steel | E) cured for 2 weeks at 23 °C |
| F) impact speed: 2 m/s | G) storage between 10 and 30 °C |
CURE MECHANISM
SikaPower®-1277 cures by chemical reaction of the two components at room temperature. The cure rate is accelerated and the final glass transition temperature, as well as the tensile and shear strengths, may be significantly increased at higher curing temperatures. The following table shows typical lap-shear strengths reached after different curing times and temperatures.
| Temperature | Time | Strength |
| 23 °C | 24 hours | 20 MPa |
| 60 °C | 60 minutes | 10 MPa |
| 80 °C | 30 minutes | 15 MPa |
Table 1: Typical lap-shear strength development at different curing conditions (strength tested at 23 °C)
CHEMICAL RESISTANCE
In view of potential chemical or thermal exposure, it is required to conduct a project related testing.
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
SikaPower®-1277 is dispensed from dual cartridges with adequate piston guns or from pails with 2-component equipment. If dispensed out of equipment, the mixer needs to be tailored for the specific application.
Cartridge use: Extrude adhesive without mixer to equalize the filling levels. Attach the mixer and dispose the first few cm of the bead prior to the application.
Apply the adhesive on both bonding surfaces and use a spatula to spread it. Join the parts within the open time of 1 hour. If the product is used with a single bead contact Sika prior to the application. The mixer open time is 30 minutes.
Removal
Uncured SikaPower®-1277 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-350 H or a suitable industrial hand cleaner and water. Do not use solvents on skin!
STORAGE CONDITIONS
SikaPower®-1277 has to be kept between 10 °C and 30 °C in a dry place. Do not expose to direct sunlight or frost. After opening of the packaging, the contents have to be protected against humidity.