Sikasil® SG-20
Sikasil® SG-20 is a 1-component, neutral-curing structural glazing silicone adhesive, which combines mechanical strength with high elongation. It adheres excellent to a wide range of substrates.
- UV and weathering resistance
- SNJF-VEC recognized (product code: 2436)
- Fire rated class B1 (DIN 4102-1)
- Meets requirements for the use as bonding sealant according to EAD 090010-00-0404, EN 15434 and as structural sealant according to ASTM C1184, ASTM C920 for Type S, Grade NS, Class 25 (movement capability ± 25 %)
- ETA-06/0090 issued by Technical Assessment Body Centre Scientifique et Technique du Bâtiment
- CE marked, surveillance by notified body: 0757
- Declaration of Performance available
- Design tensile strength for dynamic loads:
- σdes = 0.17 MPa (ETA-06/0090)
- Contributes to LEED v4/v4.1 EQc 2: Low-Emitting Materials
- Complies with common VOC requirements: Indoor Air Comfort GOLD: pass, EMICODE: EC1 Plus, French VOC Regulation: A+, BREEAM International (v.6 2021)/BREEAM NOR (v.6 2022): Exemplary Level, M1: pass, Global LEED v4/v4.1 beta EQc 2: Low-Emitting Materials: CDPH-IAQ SCAQMDRule1168
PRODUCT BENEFITS
- UV and weathering resistance
- SNJF-VEC recognized (product code: 2436)
- Fire rated class B1 (DIN 4102-1)
- Meets requirements for the use as bonding sealant according to EAD 090010-00-0404, EN 15434 and as structural sealant according to ASTM C1184, ASTM C920 for Type S, Grade NS, Class 25 (movement capability ± 25 %)
- ETA-06/0090 issued by Technical Assessment Body Centre Scientifique et Technique du Bâtiment
- CE marked, surveillance by notified body: 0757
- Declaration of Performance available
- Design tensile strength for dynamic loads:
- σdes = 0.17 MPa (ETA-06/0090)
- Contributes to LEED v4/v4.1 EQc 2: Low-Emitting Materials
- Complies with common VOC requirements: Indoor Air Comfort GOLD: pass, EMICODE: EC1 Plus, French VOC Regulation: A+, BREEAM International (v.6 2021)/BREEAM NOR (v.6 2022): Exemplary Level, M1: pass, Global LEED v4/v4.1 beta EQc 2: Low-Emitting Materials: CDPH-IAQ SCAQMDRule1168
Usage
Sikasil® SG-20 is ideal for structural glazing and other bonding applications where high mechanical performance with silicone is required. This product is suitable for experienced professional users only. Tests with actual substrates and conditions have to be performed ensuring adhesion and material compatibility.Packaging
| Cartridge | 300 ml |
| Unipack | 600 ml |
| Pail | 25 kg |
| Drum | 250 kg |
Product Details
| Chemical base | 1-component silicone | |
| Color (CQP001-1) | Black, grey S6, white S3 | |
| 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) | 25 minutes A | |
| Tack free time (CQP019-3) | 180 mintues A | |
| Curing speed (CQP049-1) | (see diagram) | |
| 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) | 7 N/mm | |
| Service temperature | -40 ─ 150 °C | |
| Shelf life (CQP016-1) | 9 months B |
| CQP = Corporate Quality Procedure | A) 23 °C / 50 % r. h. | B) stored below 25 °C |
CURE MECHANISM
Sikasil® SG-20 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
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 can be processed with manual, 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.
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 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 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 or a suitable industrial hand cleaner and water.
Do not use solvents on skin.
Overpainting
Sikasil® SG-20 cannot be overpainted.
Application limits
Recommended solutions from Sika for structural glazing and window bonding are usually compatible to each other. These solutions consist of products such as Sikasil® SG, IG, WS and WT series.
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, 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.