SikaForce®-712 L7
SikaForce®-712 L7 is a fast curing, low viscous 2-component polyurethane adhesive for bonding sandwich panels and similar constructions of various materials.
- Low density
- Low viscosity
- Short press time
- Room temperature curing
- Solvent free
PRODUCT BENEFITS
- Low density
- Low viscosity
- Short press time
- Room temperature curing
- Solvent free
Areas of Application
SikaForce®-712 L7 is used primarily for bonding of metal, fiber cement, wood and glass fiber reinforced plastic to expanded and extruded polystyrene foam, polyurethane foam and mineral wool in the manufacturing of sandwich elements and other constructions. This product is suitable for experienced professional users only. Tests 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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| Cure mechanism | Polyaddition | ||||
| Density (uncured) |
mixed (calculated) |
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| Solid content |
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| Mixing ratio | by volume by weight | 100 : 30 100 : 26 | |||
| Viscosity (CQP029-4) | Rheometer, PP25, shear rate 10 s-1, d=1 mm mixed |
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| Application temperature | 15 – 30 °C | ||||
| Pot-life (CQP536-3) | 9 minutes A | ||||
| Open time (CQP526-3) | 25 minutes A | ||||
| Press time (CQP590-4) | 1 MPa | 45 minutes A | |||
| Shore D hardness (CQP023-1 / ISO 48-4) | 70 B | ||||
| Tensile strength (CQP543-1 / ISO 527) | 16 MPa B | ||||
| Elongation at break (CQP543-1 / ISO 527) | 40 % B | ||||
| Tensile lap-shear strength (CQP546-1 / ISO 4587) | 10 MPa B | ||||
| Shelf life |
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| CQP = Corporate Quality Procedure | A) 23 °C / 50 % r.h. | B) 12 weeks at 23 °C / 50 % r.h. |
CURE MECHANISM
The curing of SikaForce®-712 L7 takes place by a chemical reaction of the two components. Higher temperatures speed up the curing process and lower slow it down.
CHEMICAL RESISTANCE
In case of chemical or thermal exposure, conduct project related testing.
Application
Surface preparation
Surfaces must be clean, dry and free from grease, oil, dust and contaminants. After the cleaning process, a physical or chemical pre-treatment might be required, depending on surface and type of material. The type of pre-treatment must be determined by tests.
Application
Typically a coat weight between 150 and 350 g/m2 is applied, depending on the substrates to be bonded. The specific coat weight for a given substrate combination must be determined by tests.
The procedure for manual application is as follows: Ensure that the A-component is stirred thoroughly to avoid any sediment or separation, taking care not to stir too vigorously as this may introduce air into the product. Add the B-component in the specified ratio and stir thoroughly, ensuring a homogeneous mixture is achieved.
Apply before reaching half of the pot-life and join parts together within the open time. Consider that, if mixed in larger amounts, the exothermic reaction can reduce the pot-life and open time significantly.
For automated applications, contact the System Engineering Department of Sika Industry.
Pressing
An adequate bonding pressure is necessary to obtain a voidless contact between the substrates and the adhesive. The specific pressure is, however, dependent on the core material and must be determined by tests. The pressure must always be below the maximum compressive strength of the core. After starting the press process, do not release the pressure until the press time has elapsed.
Removal
Uncured SikaForce®-712 L7 may be removed from tools and equipment with SikaForce®-096 Cleaner. 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.
STORAGE CONDITIONS
SikaForce®-712 L7 has to be kept between 10 °C and 30 °C in a dry place. Do not expose it to direct sunlight or frost. After opening of the packaging, the content has to be protected against humidity.
The lowest allowed temperature during transportation is -20 °C for max. 7 days.