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Sikaflex®-221i - One-component adhesive and sealant
Sikaflex®-221i is a high-quality, multifunctional, stable one-component polyurethane adhesive and sealant. The product cures by exposure to atmospheric moisture. Sikaflex®-221i is used for general waterproofing and lightweight construction applications.
Product benefits
- 1K-. Formulation
- Elastic
- Low odour
- Non-corrosive
- Overpaintable
- Sandable
- Broad adhesion spectrum
- Solvent-free and very low VOC
- Low isocyanate content
Application
Sikaflex®- 221i adheres well to a variety of substrates and is suitable for an elastic, durable seal. Suitable substrates include metals, primers and paints (two-component systems), ceramic materials and plastics. Follow manufacturer's recommendations before using Sikaflex®-221i on materials at risk of stress cracking. Preliminary tests must be carried out on original materials to avoid stress cracking. This product is suitable for experienced users only. To ensure adhesion and material compatibility, preliminary tests must be carried out with original materials under the respective conditions.
Chemical base: 1-K polyurethane
Colour (CQP001-1): White, grey, black
Curing mechanism: Moisture curing
Density before curing: 1.3 kg/l (depending on colour)
Stability: Good
Processing temperature: 10 to 40 °C
Skin forming time (CQP019-1): 60 minutes (at 23 °C / 50 % r. F. )
Volume change (CQP014-1): -3 %
Hardness Shore A (CQP023-1 / ISO 7619-1): 45
Tensile strength (CQP036-1 / ISO 527): 1.8 MPa
Elongation at break (CQP036-1 / ISO 527): 700 %
Tear resistance (CQP045-1 / ISO 34): 8 N/mm Insertion temperature (CQP513-1): -50 to 90 °C (4 hours 120 °C) / 1 hour 140 °C)
Life (CQP016-1): 12 months (storage below 25 °C)