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All Categories > Construction Sealants & Adhesives > Sika Construction Sealants > Sikaflex 1A One Part Polyurethane Sealant  
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Sikaflex 1A One Part Polyurethane Sealant

Sikaflex-1a is a premium-grade, high-performance, moisture-cured, 1-component, polyurethane-based. non-sag elastomeric sealant Meets Federal specification TT-S-00230C. Type II. Class A. Meets ASTM C-920. Type S, Grade NS, Class 25, use T, NT, O, M. G, I; Canadian standard CAN/CGSB 19 13-MB7.

Where to Use

  • Designed for all types of joints where maximum depth of sealant will not exceed in.
  • Excellent for small joints and fillets. windows, door frames. reglets, flashing, and many construction adhesive applications
  • Suitable for vertical and horizontal joints, readily placeable at 40°F.
  • Has many applications as an elastic adhesive between materials with dissimilar coefficients of expansion.
  • Submerged conditions. such as canal and reservoir joints


  • Eliminates time, effort, and equipment for mixing, filling cartridges- pre-healing or thawing, and cleaning of equipment.
  • Fast tack-free and final cure times.
  • High elasticity - cures to a tough, durable. flexible consistency with exceptional cut and tear-resistance.
  • Stress relaxation.
  • Excellent adhesion - bands to most construction materials without a primer.
  • Excellent resistance to aging, weathering.
  • Proven in tough climates around the world
  • USDA-approved.
  • Odorless, non-staining.
  • Jet fuel resistant.
  • NSF-approved for potable water contact
  • Urethane-based: suggested by EPA for radon reduction
  • Paintable with water-, oil-and rubber-based paints.
  • Capable of ±25% joint movement

Item #

Product Name


Unit Quantity


SIK1A.SC SikaFlex 1A Polurethane Sealant Per 10oz Cartridge 24 Per Case 1 lb. Per Cartridge
SIK1A.SS SikaFlex 1A Polurethane Sealant per 20oz sausage 20 per case 1.5 lbs Per Sausage


Sikaflex1a Data Sheet

Sikaflex1a MSDS