Sikaflex 521 Light Gray UV Resistant Low Modulus Sealant 300ml Cartridge

Sika Corporation
Item #
Mfr. Model # 563890

SiSikaflex 521, Light Gray, UV Resistant Low Modulus Sealant, 300ml Cartridge

Sikaflex-521 UV is a multi-purpose, UV resistant, non-sag, elastic, one-part silane-terminated polymer sealant, which cures on exposure to atmospheric moisture to form a durable elastomer. Sikaflex-521 UV is solvent and isocyanate free.

Sikaflex-521 UV bonds well to a wide variety of substrates and is suitable for making permanent, high strength elastic seals. Compatible substrate materials include wood, metals, (particularly aluminum including anodized components), sheet steels (including phosphated, chromated and zinc-plated components), metal primers and paint coatings (two-part systems), cera¬mic materials, plastics and glass.

Characteristics and Advantages:

  • Bonds well to a wide variety of substrates without the need for special pre-treatment
  • Resistant to UV radiation
  • Very low VOC/solvent free
  • Silicone and PVC-free
  • Isocyanate-free
  • High electrical resistance
  • Resistant to aging and weathering
  • Elastic
  • Low odor
  • One-part formulation

Case Quantity: 12 Cartridges

  • Aging and weathering-resistant
  • Bonds well to a wide variety of substrates without the need for special pre-treatment
  • Isocyanate- and solvent-free
  • Can be painted
  • Can be sanded
  • Low odor
Product Details
Specification Description
# of Components: Single Component
Adhesive/Glue Type: Caulks & Sealants
Brand Name: Sika Corporation
Brand Part Number: 563890
Chemical Base: Hybrid
Color: Light Gray
Cure Mechanism: Moisture
Elongation: 400%
Model: Sikaflex 521
Operating Temperature: -58° to 194°F
Package Type: Cartridge
Paintable: Yes
Primary Application: Outdoor
Shelf Life: 365 days
Shore Hardness: 40A
Size: 300 ml
Temperature Rating: Standard (Less Than 200°F)
Tensile Strength: 260 psi
Working/Tack/Skin Time: 30 Minutes
$15.50 / each
  • 12+ for $14.95 / each
  • 48+ for $12.95 / each

270 units in stock. Estimated to ship Tue. Jun 25 Need more? Estimated to ship Mon. Jul 08.