Sikaflex 221 Light Grey 300ml grey one-component polyurethane adhesive/sealant for metal, paint coatings, ceramics
Product code: 54664
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Product description
Sikaflex®-221 light grey 300 ml is a one-component, non-sag polyurethane sealant engineered for precise sealing and bonding of metal, painted, ceramic and plastic substrates. It cures with ambient moisture to form durable, elastic joints that withstand vibration, UV exposure and corrosion. Its formulation minimizes shrinkage and allows for subsequent sanding or painting, and it meets EN45545-2 R1/R7 HL3 for rail applications while performing in temperatures from –50 °C to +90 °C.
Benefits and Unique Features
- One-component – ready to use without mixing
- Non-sag consistency – stays in place on vertical surfaces
- Minimal shrinkage (5 %) for precise joints
- High resistance to ageing and UV radiation
- Sandable and paintable after full cure
- Meets EN45545-2 R1/R7 HL3 for rail industry applications
Properties and Applications
- Chemical base: one-component polyurethane
- Colour: light grey
- Density (uncured): 1.3 kg/l
- Application temperature: +5 °C to +40 °C
- Open time: 45 min at 23 °C / 50 % RH
- Skin-over time: 60 min at 23 °C / 50 % RH
- Shrinkage: 5 %
- Shore A hardness: 40
- Tensile strength: 1.8 MPa
- Elongation at break: 500 %
- Service temperature: –50 °C to +90 °C (24 h), briefly up to +120 °C / +140 °C
- Applications: bonding and sealing of vehicle bodies, panels, rail cars, metals, ceramics and plastics
Technical Specifications
| Parameter | Value |
|---|---|
| Cartridge volume | 300 ml |
| Chemical base | One-component polyurethane |
| Density | 1.3 kg/l |
| Open time | 45 min (23 °C / 50 % RH) |
| Skin-over time | 60 min (23 °C / 50 % RH) |
| Shrinkage | 5 % |
| Shore A hardness | 40 |
| Tensile strength | 1.8 MPa |
| Elongation at break | 500 % |
| Service temperature | –50 °C to +90 °C (24 h), briefly +120 °C / +140 °C |
| Shelf life | 12 months (stored < 25 °C) |
Storage Recommendations
Store in a cool, dry place at +5 °C to +25 °C, protected from direct sunlight and frost. Keep container tightly closed in its original packaging.
Instructions for Use
- Ensure all substrates are clean, dry and free of grease, oil and dust.
- Shake the cartridge thoroughly before use and load into a caulking gun.
- Apply at +5 °C to +40 °C; optimal performance at +15 °C to +25 °C.
- Assemble parts within the open time (45 min) to achieve full adhesion.
- Smooth the joint before skin-over time (60 min) using Sika® Tooling Agent N or a soap-water solution.
- Remove uncured sealant with Sika® Remover-208; cured material must be removed mechanically.
- Clean tools and skin with Sika® Cleaner-350H and water immediately after use.
Product safety
Responsible person in the EU
Sika Poland Sp. z o.o.
Karczunkowska 89
02-871 Warszawa, Poland
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