OSI® SC-175 Acoustical Caulk

Professional-Grade Soundproofing Sealant

Seal out unwanted noise with OSI® SC-175 Acoustical Caulk, the trusted choice for professional soundproofing and acoustic installations. Designed specifically for sealing gaps, joints, and seams in sound-rated wall systems, this non-hardening sealant remains flexible to maintain long-term acoustic performance.

Perfect for use with drywall, Mass Loaded Vinyl (MLV), acoustic panels, and resilient channels, SC-175 helps block sound transmission by eliminating sound leaks around wall perimeters, electrical outlets, and penetrations.

Key Features

Excellent Sound Isolation: Maintains STC (Sound Transmission Class) performance of sound-rated assemblies.

Flexible & Non-Hardening: Stays pliable to accommodate structural movement without cracking.

Paintable & Easy to Clean: Smooth finish that can be painted after curing for a professional look.

Adheres to Multiple Surfaces: Bonds strongly to drywall, wood, metal, concrete, and gypsum board.

VOC-Compliant & Low Odor: Safe for indoor use and environmentally friendly.

Applications

Ideal for:

Sealing wall and ceiling perimeters in stud wall assemblies

Use with Mass Loaded Vinyl (MLV) for airtight acoustic barriers

Filling gaps around electrical boxes, windows, doors, and baseboards

Professional studio, office, home theater, and apartment soundproofing projects

Product Specifications

Color: White

Volume: 28 fl. oz. (828 mL) cartridge

Coverage: Approximately 40 linear feet (⅜" bead)

Cure Type: Non-curing (remains flexible)