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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
$361.19
Availability:
In stock
( 3 Available )
SKU
17758
Sika Duoflex NS – 1.5 Gal
Sika Duoflex NS is a two-component, non-sag, premium polysulfide sealant formulated for vertical and overhead joints. It provides long-term elasticity, excellent adhesion, and superior resistance to fuels, oils, water, and many chemicals. Effective under constant immersion when primed with Sika Duoflex Primer-5050, it is suitable for both interior and exterior applications. With movement capability of ±25% and strong abrasion resistance, Duoflex NS is ideal for demanding environments such as curtain walls, masonry walls, ceilings, pools, and refueling areas.
For Horizontal Applications See SL
Key Features
- Two-component, non-sag polysulfide formulation.
- Premium sealant for vertical and overhead applications.
- Movement capability of ±25%.
- Excellent resistance to fuels, oils, solvents, mild acids, and alkalis.
- Performs under constant immersion when properly primed.
- Resilient across wide temperature ranges.
- Superior adhesion to concrete, masonry, stone, metal, glass, and wood.
- NSF/ANSI 61 certified for potable water contact after full cure.
Applications
- Expansion and control joints in concrete and masonry walls.
- Precast concrete panels and curtain wall joints.
- Perimeters of aluminum windows and metal panels.
- Joints in and around swimming pools.
- Primary and secondary containment structures.
- Gas stations, refueling areas, and industrial facilities.
Technical Specifications
| Chemistry | Two-component polysulfide sealant |
| Consistency | Non-sag (Grade NS) |
| Movement Capability (ASTM C920) | ±25% |
| Tensile Strength (ASTM D412) | 150–200 psi |
| Elongation at Break (ASTM D412) | 500–550% |
| Shore A Hardness (ASTM D2240) | 25–30 |
| Abrasion Resistance | Excellent |
| Static Puncture Resistance | Excellent |
| UV Exposure / Color Stability | Very good |
| Service Temperature Range | -40°F to 170°F (-40°C to 77°C) |
| Pot Life | ~1 hour at 73°F (23°C) |
| Tack-Free Time | ~6 hours at 73°F (23°C) |
| Full Cure | ~7 days at 73°F (23°C) |
| Packaging | 1.5 gal (5.7 L) unit |
| Shelf Life | 12 months unopened |
| Compliance | ASTM C920, Type M, Grade NS, Class 25, Use T2, NT, I, A, G, M, O; NSF/ANSI 61 certified |
Frequently Asked Questions
What surfaces can Duoflex NS adhere to?
It bonds to concrete, masonry, stone, metal, wood, ceramic, and glass, typically without primer. For immersion service, Sika Duoflex Primer-5050 is required.
Is Duoflex NS suitable for submerged conditions?
Yes. With proper priming, it performs effectively under constant immersion or saturated conditions.
What is the recommended movement capability?
Duoflex NS is designed for ±25% joint movement.
Can it resist fuel and oil exposure?
Yes. It resists fuels, oils, solvents, mild acids, alkalis, and many chemicals.
Is it certified for potable water contact?
Yes. It is NSF/ANSI 61 certified for potable water system components after full cure.
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