Sikaflex 1A Polyurethane Sealant, 20 fl oz. (Select Color & Quantity)

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Sikaflex 1A - One Component, Flexible, Non Sag, Polyurethane Concrete and Masonry Sealant For Vertical and Horizontal Surfaces - Sikaflex 1A 20oz. Sausage Foil Pack (Choose 5, 10 or 20 packs, Select White/Aluminum Gray/Limestone)

Sikaflex 1A is a premium grade, high performance, moisture cured, one component, polyurethane based, non sag elastomeric sealant. Sikaflex 1A has excellent adhesion and bonds to most construction materials without a primer. It has durability and resistance to aging and weathering and can be used in green and damp concrete applications. Sikaflex 1A cures to a tough, durable and flexible consistency: +/- 35% movement. Sikaflex 1a is designed for all types of joints where maximum depth of sealant will not exceed 1/2 in. It is ideal for small joints and fillets, windows, door frames, reglets, flashing, common roofing detail applications, and many construction adhesive applications. Sikaflex 1A is also jet fuel resistant and is able to be used in submerged conditions, such as canal and reservoir joints.


  • Fast tack-free and final cure times
  • Flexible ±35% movement
  • High elasticity - cures to a tough, durable, flexible consistency
  • Exceptional cut and tear resistance
  • Yield
    • 1/4" bead will yield 48 ft. of sealant
    • 3/8" bead will yield 22 ft. of sealant
  • Stress relaxation
  • Excellent adhesion - bonds to most construction materials without a primer
  • Weatherproof - proven in tough climates around the world
  • Odorless, non-staining
  • Jet fuel resistant
  • Certified to NSF/ANSI Standard 61 for potable water
  • Urethane-based, suggested by RPA for radon reduction
  • Paintable with water, oil, and rubber based paints
  • 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.

Please note: This listing is only for the Sikaflex 1A Polyurethane Sealant. A gun is required to apply this product.

  • Sikaflex 1A 20oz. Sausage Packs
    • Your choice between 5, 10 or 20 packs
    • Your choice between the colors White, Limestone or Aluminum Gray

Interested in a complete kit? Please see our Sikaflex 1A kit listing here.

Application and Use: Use between 40° and 100°F, in cool weather store at room temperature for 24 hours prior to use. For best performance apply Sikaflex when joint is at mid-point of its expansion and contraction. Apply sealant with steady pressure, forcing the sealant into the joint. Sealant should be applied to both sides of joint, use bond breaker tape to prevent bond at base of joint. If the depth of the joint exceeds 1/2" use of a backer rod is recommended. Tool sealant to ensure full contact with joint walls and remove trapped air. Do not tool with detergent or soap solutions. Tooling results in a correct bead shape, a neat joint and maximum adhesion. Allow 1 week cure when using Sikaflex 1A in total water immersion situations or before painting.

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Shipping: Free shipping only applies to continental U.S. For shipping outside the continental U.S, please contact our service team for assistance. This product is also available for Pick Up from our Farmingdale, NJ warehouse. To arrange a pick-up please contact our team via email or phone call for assistance. 

Use by Date? - No worries. We guarantee you the freshest product every time you order. 

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