Sikaflex® NP 1

(formerly MSeal NP 1)

ONE-COMPONENT, ACOUSTIC/SOUND DAMPING, ELASTOMERIC, GUN-GRADE POLYURETHANE SEALANT

Sikaflex® NP 1 is a one-component, high-performance, non-priming, gun-grade, elastomeric polyurethane sealant. It requires no mixing and typically requires no priming to bond to many materials, including concrete and masonry. Used as an acoustical sealant, Sikaflex® NP 1 reduces sound transmission in partition systems to support high STC values by sealing spaces around cut-outs and at perimeters of partitions. The sealant cures to a tough rubber to form a long-lasting acoustical seal.

• One-component formula  requires no mixing, helping to reduce labor costs
• Joint movement capability ±35% provides excellent flexibility for keeping moving joints weathertight
• Easy to gun and tool, speeding up application and making neater joints

Usage

• Interior and exterior
• Above and below grade
• Immersed in water
• Expansion joints
• Panel walls
• Precast units
• Aluminum and wood window frames
• Roofing
• Fascia
• Parapets
• Vinyl siding
• Storefront assemblies

Substrates

• Concrete
• Masonry
• Aluminum
• Wood
• Clay & concrete roof tiles
• Stucco
• Natural stone  

Advantages

• One-component formula  requires no mixing, helping to reduce labor costs
• Joint movement capability ±35% provides excellent flexibility for keeping moving joints weathertight
• Easy to gun and tool, speeding up application and making neater joints
• Available in ProPaks, reducing job site waste and lowering disposal costs
• 12 standard colors to match a wide variety of common substrates
• No primer is required for most construction materials, lowering installation costs
• Weather resistant for long-lasting weathertight seals
• Wide temperature application range makes Sikaflex® NP 1 suitable for all climates
• Compatible with non-rigid coatings and  can be painted
• Superior holding power for long-lasting roof tile installation
• UL listed; Passes 4–hour, 4–inch, fire and hose stream test when used with Ultra Block or mineral wool
• Suitable for water immersion with documented performance in wet areas
• Meets VOC requirements in all 50 states
• Can adhere to green concrete up to 72 hours after pour
• Can be used as an acoustic sealant  to increase system STC value
• Minimizes sound transfer and supports high STC ratings

Packaging

• 300 ml (10.1 fl oz) cartridges, 30 cartridges per carton, and 12 cartridges per carton
• 590 ml (20 fl oz)  ProPaks,  20 per carton

Color

White, Off-White, Limestone, Stone, Tan, Aluminum Gray, Medium Bronze, Special Bronze, Redwood Tan, Black, and Gray.

For color availability in bulk packaging, call Customer Service.

Product Details

APPROVALS / STANDARDS

• ASTM C 920, Type S, Grade NS, Class 35, Use NT, M, A, T, O* and I
• Federal Specification TT-S- 00230C, Type II, Class A
• Corps of Engineers CRD-C- 541, Type II, Class A
• Canadian Specification CAN/CGSB-19.13-M87, Classification MCG-2-25-A-N, No. 81026
• CFI accepted
• Underwriters Laboratories Inc.® classified (fire resistance only)
• ISO 11600-F-25LM • STC (sound transmission class)

* Refer to substrates in Uses