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Sikaflex-221 sealant

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Sikaflex 221

At a glance

  • Multifunctional adhesive sealant
  • Resistant to ageing
  • Paintable
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Sikaflex-221 is a 1-component polyurethane adhesive and sealant for a wide range of applications. The elastic sealant adheres well to a wide variety of substrates, including metals, metal primers, painted surfaces, ceramic materials and various plastics.

Sikaflex-221 sealant is suitable for creating durable, elastic seals and for bonding different materials. Thanks to its good ageing resistance, the sealant is suitable for applications where a long-lasting elastic bond or seal is required.

The sealant cures by reaction with atmospheric moisture and has good non-sag properties. Sikaflex-221 can also be sanded and overpainted, making it suitable for applications where the finish after sealing or bonding is important.

Features of Sikaflex-221 

  • Multifunctional adhesive and sealant.
  • Adheres well to a wide variety of substrates.
  • Suitable for permanent, elastic seals.
  • Good ageing resistance.
  • Can be sanded and painted over.
  • Non-corrosive.
  • Low odour.
  • Complies with EN 45545-2 R1/R7 HL3.

Applications

Sikaflex-221 can be used for sealing and bonding various materials. The product is suitable for use on:

  • Metals.
  • Aluminium.
  • Metal primers.
  • Painted surfaces and two-component coatings.
  • Ceramic materials.
  • Various plastics.

This adhesive and sealant is suitable for both industrial applications and general assembly, sealing and repair work where an elastic bond or seal is required.

Application

We recommend applying Sikaflex-221 to a clean and dry surface, free from grease, oil and dust. Surface preparation depends on the substrate and is crucial for long-lasting adhesion. Sikaflex-221 can be applied at temperatures between 5°C and 40°C. Please note that temperature affects the product’s reactivity and application properties. The optimum temperature for both the substrate and sealant is between 15°C and 25°C. Sikaflex-221 can be applied using a manual, pneumatic or electric piston gun, or pump equipment.

Specifications

Contents: 300 ml cartridge
Chemical basis: 1-component polyurethane
Colour: white, grey, black and beige
Curing mechanism: moisture curing
Density (uncured): 1.3 kg/l
Non-sag properties: good
Ambient application temperature: 5–40 °C
Skin formation time: 60 minutes (23 °C / 50 % RH)
Open time: 45 minutes (23 °C / 50 % RH)
Shrinkage: 5 %
Hardness (Shore A): 40
Tensile strength: 1.8 MPa
Elongation at break: 500 %
Tear resistance: 7 N/mm
Shelf life: 12 months (stored below 25 °C)
Suitable application gun: cartridge gun

 

Product properties

The key technical properties clearly listed in one place.

Article number
LIJ001093
Polyurethaanlijm
45 minutes
Colour
White, Zwart, Gray, Overig
Aluminium, Staal
5-40 °C
One-component polyurethane (PU)
12 months
1 hour (23 °C/50% RH)
5%
7 N/mm
Good
1.8 MPa
Moisture-curing
Net contents
300 ml

Safety information

Read the warnings and use appropriate protective equipment before handling the product.

Recommended protective equipment

Hazard pictograms

Warnings and precautions

H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled.
H373 May cause damage to organs <or state all organs affected, if known> through prolonged or repeated exposure <state route of exposure if it is conclusively proven that no other routes of exposure cause the hazard>.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P284 [In case of inadequate ventilation] wear respiratory protection.
P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P342+P311 If experiencing respiratory symptoms: Call a POISON CENTER/doctor/…
P501 Dispose of contents/container in accordance with in accordance with local regulation
EUH205 Contains epoxy constituents. May produce an allergic reaction.
MDI As from 24 August 2023 adequate training is required before industrial or professional use

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