Sikaflex 221 Black 600 ml black, one-component adhesive, polyurethane sealant for metal, paint coatings, ceramics
Product code: 629105
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Product description
Discounted product – Expiry date: 01/10/2025
Sikaflex-221 black 600 ml is a one-component, non-sag polyurethane sealant and adhesive designed for durable sealing and bonding of metals, painted substrates, ceramics and plastics. It cures by ambient moisture to form flexible, UV- and vibration-resistant joints that withstand corrosion and ageing.
Benefits and Unique Features
- One-component – ready to use, no mixing required
- Non-sag formulation – stays in place on vertical and overhead surfaces
- Minimal shrinkage (5 %) for precise, gap-filling joints
- Excellent ageing and UV resistance
- Sandable and paintable after full cure
- Meets EN 45545-2 R1/R7 HL3 for rail applications
- Low odour for improved working comfort
Properties and Applications
- Chemical base: one-component polyurethane
- Colour: black
- 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 %
- Tear propagation resistance: 7 N/mm
- Service temperature: –50 °C to +90 °C (24 h), briefly +120 °C/+140 °C
- Applications: sealing and bonding of vehicle bodies, panels, rail cars, metals, ceramics and plastics
Technical Specifications
| Parameter | Value |
|---|---|
| Cartridge volume | 600 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 % |
| Tear propagation resistance | 7 N/mm |
| Service temperature | –50 °C to +90 °C, briefly +120 °C/+140 °C |
| Shelf life | 12 months (stored < 25 °C) |
Instructions for Use
- Ensure all substrates are clean, dry and free of grease, oil and dust.
- Shake the cartridge thoroughly before use and fit 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.
Storage Recommendations
Store in a cool, dry place at +5 °C to +25 °C, away from direct sunlight and frost. Keep container tightly closed in its original packaging.
Product safety
Responsible person in the EU
Sika Poland Sp. z o.o.
Karczunkowska 89
02-871 Warszawa, Poland
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