Rectorseal Metacaulk 9" X 9" Fire Rated Putty Pad
- Size: 9" x 9", 1/8" thickness
- Fire Rating: Up to 3 hours (ASTM E814/UL1479)
- Sound Rating: STC 60 with one pad for 1–2 hr rating
- Best for: Firestopping electrical boxes, conduit, and junction boxes
- Material: Moldable, non-curing intumescent putty

Rectorseal Metacaulk 9" x 9" Fire Rated Putty Pad
The Rectorseal Metacaulk 9" x 9" Fire Rated Putty Pad is a one-component, fireproof putty pad designed for electrical boxes, conduit, and through-penetration firestop systems. This non-curing, moldable pad intumesces when heated, forming an insulating char that blocks the spread of flames, smoke, gas, and water.
With a tested fire rating of up to 3 hours and a Sound Transmission Class (STC) rating of 60, these fire pads for electrical boxes ensure compliance with building codes while adding critical protection to rated assemblies.
Key Features
- Size: 9" x 9" pad, 1/8" thick
- Fire Performance: Rated up to 3 hours (ASTM E 814, UL 1479, ULC/CAN4-S115-M)
- Sound Rating: STC 60 with only one pad needed for 1–2 hour ratings
- Material: Moldable, non-curing putty that intumesces under heat
- Code Compliance: Required in rated partitions when box separation is under 24"
- Durability: Resists moisture, vibration, and extreme temperatures
- Safety: Contains no volatile solvents and no asbestos fillers
Applications
- Sealing metallic and nonmetallic electrical boxes
- Large steel boxes and junction boxes
- EMT pipe, conduit, and bundled cabling (telephone, power, communication)
- Used with UL-approved designs alongside Metacaulk FRM Mortar for additional barriers
- Provides a fire and smoke barrier even under vibration and movement
The Rectorseal Metacaulk putty pad is a proven, fire-rated solution for electrical box firestopping, combining easy hand application with long-lasting safety performance.
Specifications
| Product Information | |||
|---|---|---|---|
| Specification | Detail | Specification | Detail |
| Size | 9" x 9", 1/8" thick | Fire Rating | Up to 3 hours (ASTM E814/UL1479) |
| Sound Rating | STC 60 with one pad for 1–2 hr rating | Best For | Firestopping electrical boxes, conduit, and junction boxes |
| Material | Moldable, non-curing intumescent putty | Code Compliance | Required in rated partitions where horizontal separation of opposite-facing boxes is under 24" |
| Durability | Resists moisture, vibration, and extreme temperatures | Safety | No volatile solvents; no asbestos fillers |
