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 Hardness	25–30
Tensile Strength	150–200 psi
Elongation at Break	500–550%
Tack-Free Time	Approx. 6 hours
Pot Life	~1 hour
Cure Time	7 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.

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