MasterSeal NP 520: Siliconized acrylic latex, acoustic/sound damping sealant

How does MasterSeal NP 520 work?

MasterSeal® NP 520 is a single component, siliconized acrylic latex sealant formulated to provide easy gunnability, tooling and a fast setting seal with minimal shrinkage. It provides enhanced adhesion and weather ability, making it an ideal solution for many interior and exterior sealing applications.  Used as an acoustical sealant, MasterSeal NP 520 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:

  • Vertical or horizontal
  • Exterior or interior
  • Concrete joints
  • Joints with low movement
  • Hollow core sealings
  • Floor planks
  • Window and door frames

What are the unique features of MasterSeal NP 520?

  • Formulated to reduce shrinkage and cracking that commonly occurs in acrylic latex sealants
  • Product can be painted after 2 hours
  • Easy to gun and tool
  • Various color choices to meet aesthetic needs
  • Non-flammable, suitable for use in interior applications

What are the benefits of MasterSeal NP 520? 

  • Mulitple package sizes, sized just right for the project
  • Broad color selection including 11 popular colors
  • Paintable sealant, ensures compatibility with coatings
  • Easy to gun and tool, increasing production quality


US / Canada Product Information

Data Guide

Certification Letter

LEED Letter

Guide Spec

Safety Data Sheets (SDS):

MasterSeal NP 520 - Colors

MasterSeal NP 520 - Almond

Canada - French

MasterSeal NP 520 - Aluminum Stone

MasterSeal NP 520 - Ashbrown

MasterSeal NP 520 - Black

MasterSeal NP 520 - Bronze

MasterSeal NP 520 - Brown

MasterSeal NP 520 - Cameo

MasterSeal NP 520 - Coppertone

MasterSeal NP 520 - Dark Tan

MasterSeal NP 520 - Summer Gray

MasterSeal NP 520 - White

Direct contact

Master Builders Solutions Technical Support

Construction Systems

1-800-243-6739

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

Cert Letter

pdf (26.18 Kb)

Data Guide

pdf (96.53 Kb)

Guide Spec

doc (112.35 Kb)

LEED Letter

pdf (137.90 Kb)

Sealant Performance Selection Guide

pdf (872.11 Kb)