Sikasil® SG-20 S
Sikasil® SG-20 S is a 1-component, neutral-curing structural glazing silicone adhesive with good adhesion to a wide range of substrates.
- Meets requirement of GB 16776-2005, ASTM C 1184 & ASTM C920 for Type S, Grade NS, Class 25 (movement capability ± 25 %)
- Very good UV and weathering resistance
- Adheres well to many substrates including glass, metals, coated metals, plastics and wood
- Conformity with LEED v4 EQc 2: Low-Emitting Materials
PRODUCT BENEFITS
- Meets requirement of GB 16776-2005, ASTM C 1184 & ASTM C920 for Type S, Grade NS, Class 25 (movement capability ± 25 %)
- Very good UV and weathering resistance
- Adheres well to many substrates including glass, metals, coated metals, plastics and wood
- Conformity with LEED v4 EQc 2: Low-Emitting Materials
Areas of Application
Sikasil® SG-20 S is used for structural glazing and other bonding applications. 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 | |
| Cure mechanism | Moisture-curing | |
| Cure type | Neutral | |
| Density (uncured) | 1.41 kg/l | |
| Non-sag properties (CQP061-4 / ISO 7390) | Good | |
| Application temperature | ambient | 5 ─ 40 °C |
| Skin time (CQP019-1) | 25 minutes A | |
| Tack free time (CQP019-3) | 150 minutes A | |
| Curing speed (CQP049-1) | see diagram | |
| Shore A hardness (CQP023-1 / ISO 48-4) | 47 B | |
| Tensile strength (CQP036-1 / ISO 527) | 2.1 MPa | |
| 100 % modulus (CQP036-1 / ISO 527) | 0.6 MPa | |
| Elongation at break (CQP036-1 / ISO 527) | 500 % | |
| Tear propagation resistance (CQP045-1 / ISO 34) | 12 N/mm | |
| Service temperature | -40 ─ 150 °C | |
| Shelf life | 12 months C |
| CQP = Corporate Quality Procedure | A) 23 °C / 50 % r. h. | B) after 28 days | C) storage below 25 °C |
CURE MECHANISM
Sikasil® SG-20 S 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® SG-20 S
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® SG-20 S can be processed with manual, pneumatic or electric driven piston guns.
Joints must be properly dimensioned.
Basis for calculation of the necessary joint dimensions are the technical values of the adhesive and the adjacent building materials, the exposure of the building elements, their construction and size as well as external loads.
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® SG-20 S 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® SG-20 S may 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 cleaning towels or a suitable industrial hand cleaner and water.
Do not use solvents on skin.
Overpainting
Sikasil® SG-20 S cannot be overpainted.
Application limits
For specific information regarding compatibility between various Sikasil® products and other Sika products contact the Technical Department of Sika Industry.
To exclude materials influencing Sikasil® SG-20 S, all materials such as gaskets, tapes, setting blocks, sealants, etc., in direct and indirect contact have to be approved by Sika in advance.
Where two or more different reactive sealants are used, allow the first to cure completely before applying the next one.
The above mentioned Sika process materials may only be used in structural glazing or window bonding applications after a detailed examination and written approval of the corresponding project details by Sika Industry.