Sikaflex® NP 1 20 oz Sausage – Polyurethane Construction Sealant
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Sikaflex NP 1 (formerly MSeal NP 1) is a one-component, gun-grade polyurethane sealant designed for high-performance sealing and acoustical applications in commercial construction. This elastomeric sealant requires no mixing or priming for most substrates and cures to a durable rubber capable of long-term weatherproofing and sound reduction.
Sikaflex® NP 1 is commonly used for expansion joints, precast panels, window perimeters, roofing details, storefront systems, and acoustical partition assemblies where high STC performance is required.
FEATURES
- One-component polyurethane formula requires no mixing
- Gun-grade consistency for easy application and tooling
- Joint movement capability of ±35% for dynamic joints
- Acoustical sealant properties help reduce sound transmission
- Non-priming formulation bonds to many common construction materials
- Weather resistant for long-term exterior performance
- Paintable after cure and compatible with non-rigid coatings
- Water immersion capable for select wet-area applications
- Can adhere to green concrete up to 72 hours after pour
- Available in ProPaks to reduce jobsite waste
- UL listed for select fire-rated joint systems
- Meets VOC requirements in all 50 states
TYPICAL APPLICATIONS
- Expansion and control joints
- Acoustical partition sealing
- Precast concrete panels
- Window and door perimeters
- Roofing and parapet details
- Fascia and storefront assemblies
- Vinyl siding transitions
- Below-grade waterproofing transitions
- Wet-area and immersed applications
RECOMMENDED SUBSTRATES
- Concrete
- Masonry
- Aluminum
- Wood
- Stucco
- Natural stone
- Clay roof tile
- Concrete roof tile
SPECIFICATIONS
- Product type: Polyurethane elastomeric sealant
- Consistency: Gun-grade, non-sag
- Packaging: 20 oz ProPak sausage
- Pack quantity: 20 sausages per carton
- Movement capability: ±35%
- Application: Interior and exterior
- Service conditions: Above grade, below grade, immersed applications
- Sag resistance: No sag at 120°F
- Skin time: Overnight or within 24 hours
- Full cure: Approximately 1 week
- Immersion service cure: 21 days
APPROVALS & STANDARDS
- ASTM C920, Type S, Grade NS, Class 35
- Federal Specification TT-S-00230C, Type II, Class A
- Corps of Engineers CRD-C-541, Type II, Class A
- CAN/CGSB-19.13-M87
- ISO 11600-F-25LM
- UL Classified
- CFI Accepted
- STC acoustical performance tested
AVAILABLE COLORS
- White
- Limestone
- Stone
- Special Bronze
ACOUSTICAL PERFORMANCE
Sikaflex® NP 1 can be used as an acoustical sealant to minimize sound transfer in partition systems and improve overall STC ratings by sealing gaps around penetrations and partition perimeters.
STORAGE & APPLICATION NOTES
Application performance varies depending on temperature and humidity conditions. Typical cure times are based on 75°F and 50% relative humidity with a 1/2" x 1/4" joint configuration.
RESOURCES