Sikaflex 221 - Polyurethane sealant adhesive 300ml

Sikaflex 221 - polyurethane adhesive and sealant

Sikaflex 221 is a high-quality, universally applicable, highly adhesive, flexible one-component polyurethane sealant. Under the influence of ambient moisture, it hardens into an elastomer. Suitable for making durable elastic seals.

Capacity : 300ml

POSSIBLE BULK PACKAGING:

• Carton - 12 pcs.

APPLICATION

Sikaflex 221 is a suitable material for making flexible, durable and highly adhesive seals. Materials that can be effectively and permanently sealed and joined together in various configurations are: ordinary steel, aluminum, non-ferrous metals, wood, ceramic materials, glass, plastics.

Due to the possibility of cracking stresses in transparent and pigmented materials, manufacturers' recommendations should be followed. Testing should be performed on actual substrates and conditions to ensure adhesion and material compatibility.

PRODUCT ADVANTAGES

• one-component
• flexible
• odorless
• resistant to weather conditions
• does not cause corrosion phenomena
• suitable for painting, sanding and mechanical processing
• shows good adhesion to various materials

CHEMICAL RESISTANCE

Sikaflex 221 is generally resistant to fresh and sea water, dilute acids and alkalis; temporarily resistant to fuels, mineral oils, vegetable and animal fats; not resistant to organic acids, glycols, concentrated mineral acids and bases and solvents.

APPLICATION METHOD

Surface preparation

Surfaces must be clean, dry and free from grease, oil and dust.

App

Sikaflex 221 can be applied at temperatures between 5 °C and 40 °C but changes in reactivity and application properties must be taken into account. The optimal ambient and sealant temperature is between 15 °C and 25 °C.

Sikaflex 221 can be applied with a hand, pneumatic or electric piston gun.

Smoothing and finishing

Smoothing must be done before the sealer has developed a skin. It is recommended to use Sika Tooling Agent N for smoothing. Other smoothing agents must be previously tested for suitability and compatibility.

Removal

Uncured Sikaflex 221 can be removed from equipment and tools with Sika Remover 208 or another suitable solvent. After hardening, the material can only be removed mechanically.

Hands and exposed skin should be washed immediately with Sika Cleaner 350H wipes or a suitable industrial hand cleaner and water. Do not use solvents on the skin!

Painting

Sikaflex 221 is best painted after skin formation. The adhesion of coatings can be improved by activating the joint surface with Sika Aktivator 100 or Sika Aktivator 205 before painting.

If the painting process requires heating (>80 °C), it is best to perform this process after the sealant has fully hardened. All coatings must be verified by performing preliminary tests under production conditions.

The elasticity of paint coatings is usually lower than that of sealants. This can lead to cracks in the coating on the seal surface.

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