MasterSeal NP 1: One-component, acoustic/sound damping, elastomeric, gun-grade polyurethane sealant

Formerly: Sonolastic NP 1

How does MasterSeal NP 1 work?

MasterSeal 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, MasterSeal 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.

Recommended uses:

  • 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
  • Store front assemblies

What are the unique features of MasterSeal NP 1?

  • Available in ProPaks, reducing jobsite waste, lowering disposal costs
  • 12 standard colors to match a wide variety of common substrates
  • Wide temperature application range makes MasterSeal NP 1 suitable for all climates
  • 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

What are the benefits of MasterSeal NP 1?

  • 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
  • No primer required for most construction materials lowering installation costs
  • Weather resistant for long-lasting weather tight seals
  • Compatible with non-rigid coatings and can be painted
  • Superior holding power for long-lasting roof tile installation

US / Canada Product Information

Data Guide

Data Guide (French)

Data Guide (Spanish)

Guide Specifications

NP 1 Brochure

Certification Letter

LEED Letter

LEED v4 Letter

Color Reference - MasterSeal NP 1

Color Reference - MasterSeal All Components

Safety Data Sheets - Aluminum Gray

Safety Data Sheets - Gray

Safety Data Sheets - Limestone

Safety Data Sheets - Medium Bronze

Safety Data Sheets - Off White

Safety Data Sheets - Off White (Propack)

Safety Data Sheets - Redwood Tan

Safety Data Sheets - Special Bronze

Safety Data Sheets - Stone

Safety Data Sheets - Tan

Safety Data Sheets - White

Safety Data Sheet - White (Propack)

Safety Data Sheets - Black

Direct contact

Master Builders Solutions Technical Support

Construction Systems


Safety Data Sheet (SDS)

Find all available safety data sheets for this product.

Product Certifications

Generate a free certificate of conformance for a specific BASF construction product.

Related Literature

Certification Letter

pdf (55.42 Kb)

Color Reference

pdf (168.36 Kb)

Data Guide

pdf (158.42 Kb)

Data Guide (French)

pdf (198.81 Kb)

Data Guide (Spanish)

pdf (134.32 Kb)

Guide Spec

doc (147.00 Kb)

LEED Letter

pdf (31.01 Kb)

LEED Letter

pdf (54.79 Kb)

LEED v4 Letter

pdf (38.98 Kb)

MasterSeal NP1 Brochure

pdf (1.72 Mb)

Roofing Applications: Sealants and Adhesives Solutions Brochure

pdf (12.58 Mb)

zip (56.28 Kb)