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Sika Sikaflow 678 Epoxy Grout

Sika SikaFlow 678 Epoxy Grout 1.8CF Kit

Sika-Duoflex-SL

Sika Duoflex SL 1.5 Gal

Sika Duoflex NS 1.5 Gal

Sika Duoflex NS is a two component, non-sag, premium quality polysulfide sealant, specifically designed for vertical and overhead surfaces. Suitable for either exterior or interior use to seal both static and dynamic joints.

  • Excellent Resistance To Water
  • Effective Under Constant Immersion
  • Resilient Within a Wide Temperature Range
$345.63
Availability: In stock ( 2 Available )
SKU
17758

Sika Duoflex NS – Two-Component, Non-Sag Polysulfide Sealant

Sika Duoflex NS is a two-component, non-sag polysulfide sealant for vertical and overhead joints in concrete, masonry, and metal structures. It maintains long-term elasticity, resists fuel and UV exposure, and offers strong adhesion when paired with Duoflex Primer-5050. With ±25% movement capability and solvent-free performance, it handles dynamic conditions in wastewater facilities, fuel containment zones, precast panels, and industrial settings. It’s easy to mix, apply, and tool—no specialized installation equipment needed.

Key Features:

  • Two-part, non-sag sealant for vertical or overhead use
  • Fuel, solvent, chemical, and UV resistant
  • ±25% movement capability
  • Remains flexible in service temperatures from -40°F to 170°F
  • Long pot life and good working time
  • Used in water treatment plants, secondary containment, and more
  • Meets ASTM C920: Type M, Grade NS, Class 25

Technical Specifications:

Property Value
Movement Capability±25%
Shore A Hardness25–30
Tensile Strength150–200 psi
Elongation at Break500–550%
Tack-Free TimeApprox. 6 hours
Pot Life~1 hour
Cure Time7 days

Frequently Asked Questions:

Can Duoflex NS be submerged after installation?
Yes, but it must cure for 7 full days and be primed with Sika Duoflex Primer-5050 for wet exposure applications.

What substrates does it adhere to?
It adheres to concrete, masonry, metals, ceramics, and glass. Priming may be required for critical applications.

Is it suitable for fuel containment joints?
Yes. Duoflex NS offers excellent chemical resistance, making it appropriate for joints in fuel and chemical environments.

How should it be applied?
Mix Part B into Part A using a slow-speed drill. Apply with a bulk gun and tool the sealant while it's still workable.

More Information
BrandSika
Size1.5 Gallon
ManufacturerSika