Sikaflex®-228
Sikaflex®-228 is a 1-component self-leveling elastic-panel adhesive suitable for bonding a variety of panel materials, including solvent-resistant foams (PUR), stainless steel sheets, aluminum sheets, timber-based building boards and plasterboards.
- Ideal for large area bonding
- Self-leveling / low viscosity
- Elastic behavior
PRODUCT BENEFITS
- Ideal for large area bonding
- Self-leveling / low viscosity
- Elastic behavior
Usage
Sikaflex®-228 is suitable for bonding a variety of panel materials, including solvent-resistant foams (PUR), stainless steel sheets, aluminum sheets, timber-based building boards and plasterboards. It can also be used to seal seams and lap joints or to fill construction joints in floors. For exterior sealing applications, thin layers of Sikaflex®-228 must be protected from sunlight (e.g. by overpainting, or covering). Seek manufacturer’s advice and perform tests on original substrates before using Sikaflex®-228 on materials prone to stress cracking. This product is suitable for experienced professional users only. Test with actual substrates and conditions have to be performed to ensure adhesion and material compatibility.Packaging
Cartridge | 300 ml |
| Unipack | 600 ml |
| Pail | 23 l |
| Drum | 195 l |
Product Details
| Chemical base | 1-C polyurethane | |
| Color (CQP001-1) | Greyish white | |
| Cure mechanism | Moisture-curing | |
| Density (uncured) | 1.5 kg/l | |
| Application temperature | ambient | 5 ─ 35 °C |
| Skin time (CQP019-1) | 60 minutes A | |
| Curing speed (CQP049-1) | (see diagram) | |
| Shrinkage (CQP014-1) | 10 % | |
| Shore A hardness (CQP023-1 / ISO 48-4) | 35 | |
| Tensile strength (CQP036-1 / ISO 527) | 1 MPa | |
| Elongation at break (CQP036-1 / ISO 527) | 400 % | |
| Tear propagation resistance (CQP045-1 / ISO 34) | 4 N/mm | |
| Tensile lap-shear strength (CQP046-1 / ISO 4587) | 1 MPa | |
| Shelf life (CQP016-1) | cartridge / unipack drum / pail | 12 months B 9 months B |
CQP = Corporate Quality Procedure | A) 23 °C / 50 % r. h. | B) storage below 25 °C |
CURE MECHANISM
Sikaflex®-228 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 Sikaflex®-228
CHEMICAL RESISTANCE
Sikaflex®-228 is generally resistant to fresh water, seawater, diluted acids and diluted caustic solutions; temporarily resistant to fuels, mineral oils, vegetable and animal fats and oils; not resistant to organic acids, glycolic alcohol, concentrated mineral acids and caustic solutions or solvents.
Application
Surface preparation
Surfaces must be clean, dry and free from grease, oil, dust and contaminants.
Surface treatment depends on the specific nature of the substrates and is crucial for a long lasting bond. Suggestions for surface preparation may be found on the current edition of the appropriate Sika® Pre-treatment Chart. Consider that these suggestions are based on experience and have in any case to be verified by tests on original substrates.
Application
Sikaflex®-228 can be processed between 5 °C and 35 °C (climate and product) but changes in reactivity and application properties have to be considered. The optimum temperature for substrates and adhesive is between 15 °C and 25 °C.
If the adhesive is applied over large surface areas use a notched spreader (notch depth approx. 3 mm). The consumption is approx. 0.6 - 1.2 l per m2. If the substrates to be bonded are impervious to moisture or if an accelerated rate of cure is required, the adhesive could be lightly sprayed with a water mist shortly before the substrates are joint together (use an aerosol spray or spray gun to apply approx. 10 g water per m2). Avoid air entrapment when joining the parts or filling joints. Apply firm pressure when bringing components together and keep the bond under pressure for at least 3 hours until the adhesive has set.
For advice on selecting and setting up a suitable pump system contact the System Engineering Department of Sika Industry.
Removal
Uncured Sikaflex®-228 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 Sika® Cleaner-350H cleaning towels or a suitable industrial hand cleaner and water.
Do not use solvents on skin.