Sikasil® AS-70
Structural assembly silicone adhesive
Sikasil® AS-70 is a structural 1-component assembly silicone adhesive which combines mechanical strength with high elongation. It adheres excellent to a wide range of substrates.
- Outstanding UV and weathering resistance
- Performance retention over a wide temperature range
- Bonds excellent to glass, metals, coated metals, plastics and wood
- Long-term durability
- UL® certified: UL94 HB
PRODUCT BENEFITS
- Outstanding UV and weathering resistance
- Performance retention over a wide temperature range
- Bonds excellent to glass, metals, coated metals, plastics and wood
- Long-term durability
- UL® certified: UL94 HB
Areas of Application
Sikasil® AS-70 can be used for high demanding assembly bonding and sealing applications. With its structural and durable bonding performance it can be used for interior and exterior applications. Common substrates are metals, particularly aluminum, glass, metal primers and paint coatings (2-part systems), ceramic materials, plastics and wood. 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
| Chemical base | 1-component silicone | |
| Color (CQP001-1) | Black, grey, white | |
| Cure mechanism | Moisture-curing | |
| Cure type | Neutral | |
| Density (uncured) | 1.36 kg/l | |
| Non-sag properties (CQP061-4 / ISO 7390) | Very good | |
| Application temperature | ambient | 5 ─ 40 °C |
| Skin time (CQP019-1) | 15 minutes A | |
| Tack free time (CQP019-3) | 150 minutes A | |
| Curing speed (CQP049-1) | (see diagram 1) | |
| Shore A hardness (CQP023-1 / ISO 48-4) | 39 | |
| Tensile strength (CQP036-1 / ISO 527) | 2.2 MPa | |
| 100 % modulus (CQP036-1 / ISO 527) | 0.9 MPa | |
| Elongation at break (CQP036-1 / ISO 527) | 450 % | |
| Tear propagation resistance (CQP045-1 / ISO 34) | 8 N/mm | |
| Thermal resistance (CQP 513-1) | 4 hours 1 hour | 200 °C 220 °C |
| Service temperature | -40 ─ 150 °C | |
| Shelf life | 9 months B |
| CQP = Corporate Quality Procedure | A) 23 °C / 50 % r. h. | B) storage below 25 °C |
CURE MECHANISM
Sikasil® AS-70 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 Sikasil® AS-70
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.
Application
The optimum temperature for substrate and sealant is between 15 °C and 25 °C.
Sikasil® AS-70 can be processed with hand, pneumatic or electric driven piston guns as well as pump equipment. For advice on selecting and setting up a suitable pump system, contact the System Engineering Department of Sika Industry.
Joints must be properly dimensioned.
Joints deeper than 15 mm must be avoided.
Tooling and finishing
Tooling and finishing must be carried out within the skin time of the sealant or adhesive. When tooling freshly applied Sikasil® AS-70 press the adhesive to the joint flanks to get a good wetting of the bonding surface. No tooling agents to be used.
Removal
Uncured Sikasil® AS-70 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.
Overpainting
Sikasil® AS-70 cannot be overpainted.
Application limits
To exclude materials influencing Sikasil® AS-70, all adjacent materials in direct and indirect contact have to be tested. Where two or more different reactive sealants are used, allow the first to cure completely before applying the next.
Sikasil® AS-70 may only be used for serial application after a detailed examination and written approval of the corresponding project details by Sika Industry.