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NSi Industries Metacaulk Fire-Rated Putty Pad
The NSi Industries Metacaulk Fire-Rated Putty Pad is engineered to maintain the hourly fire rating of rated walls that contain electrical outlet boxes, while also reducing sound transmission between adjoining spaces. Sized 7" x 7" x 1/8", this single pad thickness is all that is required to achieve a 1 or 2-hour fire rating, so electricians do not need to add extra putty to plug the end of each electrical metallic tube (EMT) or conduit at its connection to the box. The pad also carries an STC rating of 60, tested in a UL 411 wall assembly/section to ASTM E90, making it a practical choice wherever fire-stopping and acoustic performance both matter. Applied by hand, the pad adheres to common interior building surfaces and installs quickly around outlet boxes during rough-in or retrofit work.
Key Features
- Pad Size: 7" x 7" x 1/8" thickness, sized to fully cover standard electrical outlet boxes in rated wall assemblies.
- Single-Layer Fire Rating: Only one pad thickness (1/8") is required to achieve a 1 or 2-hour fire rating, simplifying installation and inspection.
- Sound Attenuation: Delivers an STC rating of 60, tested in a UL 411 wall assembly/section to ASTM E90 for documented acoustic performance.
- No Additional Putty Required: Seals the end of each EMT or conduit at its connection to the box without the need for supplemental fire-stop material.
- Asbestos-Free Formula: Manufactured with no asbestos fillers, supporting safer handling on the job site.
- Easy Hand Application: Applied entirely by hand and adheres to all common building surfaces for interior use, with no special tools required.
- RectorSeal Brand Manufacturing: Produced under the RectorSeal brand within the NSi Industries portfolio of code-compliant firestop products.
Certifications & Compliance
- Tested in a UL 411 wall assembly/section to ASTM E90
- STC Rating of 60
- No Asbestos Fillers
Technical Specifications
- WARRANTY: 1 Year
- Country of Origin: United States
- Packaging: 1 ea
- Pad Dimensions: 7" x 7" x 1/8"
- Sound Transmission Class: STC 60
Typical Applications
- Fire-Rated Wall Assemblies Containing Electrical Outlet Boxes
- Sound Attenuation Between Adjoining Rooms and Units
- Commercial and Multi-Family Construction
- Renovation and New Construction Projects
- EMT and Conduit Terminations at Outlet Box Connections
- Multi-Family and Hospitality Fire- and Sound-Rated Partitions
Why NSi Industries?
NSi Industries backs the Metacaulk line of firestop products with materials engineered specifically for code-driven fire- and sound-rated construction. This putty pad is formulated without asbestos fillers and is tested in a UL 411 wall assembly/section to ASTM E90, giving electrical contractors and inspectors documented performance data to support fire-rated wall assemblies. Manufactured under the RectorSeal brand and backed by a 1-year warranty, it offers dependable, code-compliant protection for outlet boxes in rated partitions.
Manufacturer Resources
Product Specs
- Sub-Division:
- Electrical-E H2
- Division:
- Electrical H1
- Country of Origin:
- United States
- WARRANTY:
- 1 Year
- Product Type:
- Putty Pad
- Listing:
- UL 411 Tested (ASTM E90)
- Department:
- Electrical
- Product Group:
- Wiring Devices