Sikaflex® NP 1 20 oz Sausage – Polyurethane Construction Sealant

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 Product Data Sheet VOC Emissions Material Ingredient Reporting Safety Data Sheet White Safety Data Sheet Stone Safety Data Sheet Limestone Safety Data Sheet Special Bronze NP1 Brochure