Sika Sikaflex 221 sealant silicone polyurethane black 300ml
Sikaflex®-221 is a high-quality, one-component polyurethane elastic sealant and adhesive. It provides strong adhesion to a wide range of substrates and is suitable for elastic sealing and basic bonding applications in both indoor and outdoor environments.
It cures through exposure to atmospheric moisture, forming a durable and permanently elastic bond that can be sanded and painted. It is ideal for vehicle bodywork, equipment, ventilation systems, metal structures, containers and general assembly applications.
Features and Benefits
• High-strength one-component sealant and adhesive
• Good adhesion to many substrates without a primer
• Suitable for elastic sealing and basic bonding applications
• Can be sanded and painted after skin formation
• Resistant to UV exposure and aging
• Low odor and non-corrosive
• Moisture-curing formulation
• Resistant to fresh water and seawater
• Suitable for indoor and outdoor applications
• Certified according to EN 45545-2 R1/R7 HL3 for railway applications
• NSF-approved for incidental food contact, where applicable
• Approved for potable-water contact according to AS4020 in Australia
Applications
Suitable for elastic sealing and bonding on:
• Metals
• Primed and painted surfaces
• Plastics
• Ceramics
• Vehicle bodywork and vehicle construction
• Equipment and machinery
• Ventilation systems
• Containers
• Interior joints
• General assembly and basic bonding applications
Technical Specifications
• Chemical base: One-component polyurethane
• Colour: Steel grey
• Pack size: 300ml cartridge
• Curing method: Moisture curing
• Density: Approximately 1.3kg/L, depending on colour
• Sag resistance: Good
• Application temperature: +5°C to +40°C
• Skin formation time: Approximately 60 minutes at 23°C and 50% relative humidity
• Volume change: Approximately 5%
• Shore A hardness: 40
• Tensile strength: 1.8MPa
• Elongation at break: 500%
• Tear strength: 7N/mm
• Temperature resistance: -50°C to +90°C
• Short-term temperature resistance: Up to +140°C
• Shelf life: 12 months when stored below 25°C
• Railway standard: EN 45545-2 R1/R7 HL3
Application Instructions
Surfaces must be clean, dry and free from dust, oil and grease.
Apply using a manual, pneumatic or electric 300ml cartridge gun. The product can be used with a standard nozzle or a V-cut nozzle, depending on the application.
Glass and metal surfaces may require pre-treatment with Sika® Primer-207. Tooling and smoothing should be completed before skin formation using a suitable product such as Sika® Tooling Agent N.
Uncured material can be removed using Sika® Remover-208. Fully cured material can only be removed mechanically.
Paintability
Sikaflex®-221 can be painted after skin formation. For the best results, allow the sealant to cure completely before painting.
Compatibility with one-component polyurethane paints and two-component acrylic paints should be tested on a small area before full application.
Chemical Resistance
• Resistant to fresh water and seawater
• Resistant to diluted acids and alkalis
• Short-term resistance to fuels, oils and greases
• Not resistant to concentrated acids, strong alkalis or organic solvents
Safety Information
Signal word: Danger
• H334: May cause allergy or asthma symptoms or breathing difficulties if inhaled.
• H373: May cause damage to the central nervous system through prolonged or repeated exposure by inhalation.
• P260: Do not breathe mist or vapour.
• P284: Wear respiratory protection if ventilation is inadequate.
• P304 + P340: IF INHALED: Move the person to fresh air and keep comfortable for breathing.
• P342 + P311: If experiencing respiratory symptoms, call a POISON CENTER or doctor.
• P501: Dispose of contents and container in accordance with local regulations.
- Home delivery from Monday to Friday, with a maximum processing time of five (5) calendar working days.
- BoxNow service available for selected items with a maximum processing time of five (5) calendar working days. In case of increased order volume, there is a possibility of delay.
- Receiving from ACS Courier stores with a maximum processing time of seven (7) calendar working days. In case of increased order volume, there is a possibility of delay.
- Receiving from the Company's store in Limassol with a maximum waiting time of twenty-four (24) working hours. The Company will contact you when your order is ready for receipt. You can receive your order from the reception area of the Company's store. To receive your order, you must provide your order number, which you will find in the email that will be sent to you by the Company upon the completion of your order. Receipts from the Company's store are made from Monday to Friday from 08:00 - 20:00, Saturday from 08:00 - 19:00 and Sunday from 10:00 - 19:00.
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For your convenience and service, the online store of the Company accepts Visa, Mastercard & Maestro credit cards.
