Multipurpose PU sealant for long term durability

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Applications

Application Tips

Sikaflex-221
Sikaflex-221
Applications
  1. Sealing in bus body, railways, trucks, refrigeration equipments.
  2. As seam sealant in machine tools and construction equipment.
  3. Bonding and selaing in GRP fabricated structures and many more.
Replaces
Available pack size 300ml, 600ml, 23Litre
Standards NSF approved,ASTM C920, TT-S-00230C/REACH/RoHS
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Specifications

Chemical Composition Polyurethane
Curing Mechanism Moisture
Color White/Grey/Black/Brown
Specific Gravity N/A
Recommended substrates Metals, Plastics, Composites, Ceramic.
Max gap fill 6mm
Tack Free Time 60min
Elongation at Break 500% approx
Hardness 40 Shore A
Tensile Strength 1.8MPa
Service Temperature -40°C to 90°C

Features and Benefits

Very elastic and strong
NSF approved for incidental food contact
Bonds well to a variety of applications

Notes

  • Exhibits superior performance in transformer oil application
  • Curing speed can vary depending on moisture and humidity presence
  • Sealant inside an enclosed chamber can have delayed curing. Humidity chamber can be used to speedup.

Applications

Sikaflex 221 is for sealing applications in automotive, transportation, Wind, Solar industry.

This application is successfully executed for sealing of a cable joint in an electric motor of a giant industrial fan. In many end use these fans are used in outdoor areas or in locations where rain water can come into contact through roof holes. It was found that water would generally find its way through the cable groove and seep inside the motor windings causing malfunction. The problem is resolved by a slight modification in design and using Sikaflex 221 Polyurethane sealant.

Sikaflex 221 : Sealing & finishing of weld joints on diamond cut walkways prior to painting process.

This is a video of Sikaflex 221 in sachet packing. It is used for sealing and finishing of weld joints on diamond cut walkways prior to painting process. These walkways are manufactured in two parts and then joined by welding process. Welding leaves poor finish and uneven gaps even micro porosity that can lead to water seepage. Sikaflex 221 eliminates these problems by filling the pores, providing uniform finish and is paint-able post application. The final product is reliably leak proof and aesthetically appealing and long lasting

Sikaflex 221: Non sag Polyurethane Sealant for demanding Industrial and Automotive applications

Sikaflex 221 is used in

  • Sealing in bus body, railways, trucks, refrigeration equipment
  • As seam sealant in machine tools and construction equipment
  • Bonding and sealing in GRP fabricated structures and many more