Sikaflex 1a Construction Sealant

Sikaflex 1A All Purpose Polyurethane Adhesive

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 35, use T, NT, O, M, G, I, A; Canadian standard CAN/CGSB 19.13-M87.


  • Designed for all types of joints where maximum depth of sealant will not exceed 1/2 in. 
  • Excellent for small joints and fillets, windows, door frames, reglets, flashing, common roofing detail applications, 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-heating 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 - bonds to most construction materials 
    without a primer.
  • Excellent resistance to aging, weathering.
  • Proven in tough climates around the world.
  • Can be applied to green concrete 24 hours after pour
  • Can be applied to damp concrete 1 hour after getting wet
  • Odorless, non-staining.
  • Jet fuel resistant.
  • Certified to the NSF/ANSI Standard 61 for potable water.
  • Urethane-based; suggested by EPA for radon reduction.
  • Paintable with water-, oil- and rubber-based paints.
  • Capable of ±35% joint movement.

TYPICAL DATA (Material and curing conditions @ 75°F (24°C) and 50% RH)

Shelf Life: Cartridge and Sausage: 12 months in original, unopened packaging.
Pail and Drum: 6 months in original, unopened packaging.
Storage: Store at 40°-95°F (4°-35°C).
Product Conditioning: Condition materialto 65°-75°F before using.
Colors: White,colonial white, aluminum gray, limestone, black, dark bronze, capitoltan, stone and medium bronze. Special architecturalcolors on request.
Application Temperature: 40° to 100°F. Sealant should be installed when joint is at mid-range of its anticipated movement.
Service Range: -40° to 170°F
Curing Rate Tack-free time 3 to 6 hours
Tack-free to touch 3 hours
Full Cure: to 7 days
Tear Strength (ASTM D-624): 55 lb./in.
Shore A Hardness (ASTM C-661): 21 day 45±5
Movement Capability (ASTM C-719): 35%
Tensile Properties (ASTM D-412):
21 day Tensile Stress
Elongation @ Break
Stress @ 100%
175 psi (1.21 MPa)
85 psi (0.59 MPa)
Adhesion in Peel (TT-S-00230C, ASTM C 794):
Substrate Peel Strength Adhesion Loss Concrete 20 lb. 0%
Aluminum 20 lb. 0%
Glass 20 lb. 0%
Weathering Resistance: Excellent

Write Your Own Review
You're reviewing:Sikaflex 1a Construction Sealant