Metacaulk Putty is a moldable, non-curing, one-component fire-rated material designed for through-penetration firestop systems.

When exposed to fire, the intumescent formula expands and forms an insulating char that helps prevent the spread of flames, smoke, gas, and water through penetrations.

Designed for easy installation in commercial, residential, and industrial applications, Metacaulk Putty provides reliable passive fire protection without mixing or special tools. Its flexible formulation allows quick application around cables, conduits, metal pipes, electrical boxes, and other approved penetrations.

Key Features

• Non-curing, moldable, one-component firestop material.

• Intumescent technology expands when exposed to fire.

• Forms an insulating char to help maintain fire-rated assemblies.

• Helps prevent the passage of flames, smoke, gas, and toxic gases.

• For interior use with no volatile solvents.

• Suitable for confined spaces and occupied areas.

• Contains no asbestos fillers.

• D.O.T. Classification: Not Regulated.

• Applied by hand with no mixing, additives, or special tools required.

• Adheres to common building surfaces.

• Rated for up to 3 hours in accordance with ASTM E 814, UL 1479, and ULC/CAN4-S115-M test standards.

• Putty pads provide a Sound Transmission Class (STC) rating of 60.

• Only one 1/8-inch pad thickness is required for 1–2 hour fire ratings in approved applications.

• No additional putty material is needed to plug the end of each electrical metallic tube or conduit connection to the box.

• Meets building code requirements for rated partitions where opposite-facing electrical boxes have less than 24 inches of horizontal separation.

Common Applications

• Through-penetration firestop systems.

• Cable penetrations.

• Electrical conduit.

• Metal pipe penetrations.

• Electrical metallic tubing (EMT).

• Metal and non-metallic electrical boxes.

• Fire-rated walls and floors.

• Blank openings.

• Commercial buildings.

• Residential construction.

• Renovation and retrofit projects.

Ideal For

• Small openings.

• EMT pipe penetrations.

• Steel penetrations.

• Conduit and cabling applications.

• Telephone, power, and communication cables.

• Electrical box firestopping applications.

Key Benefits

Reliable Fire Protection

The intumescent formulation expands during fire exposure to create an insulating char that helps maintain the integrity of fire-rated assemblies and limit the spread of fire, smoke, and gases.

Simple Installation

Metacaulk Putty is applied by hand and requires no mixing, special skills, additives, or equipment, making installation quick and efficient.

Excellent Sound Control

Putty pads provide an STC rating of 60, helping reduce sound transmission through electrical boxes and wall penetrations.

Code-Compliant Performance

Designed to meet tested firestop requirements for rated partitions and approved through-penetration systems.

Safe Interior Application

The solvent-free formulation contains no asbestos fillers and is suitable for use in occupied and confined spaces.

How to Use

Surface Preparation

• Ensure surfaces are clean, dry, and free from dust, debris, and contaminants.

• Verify that the installation follows an approved firestop system.

• Confirm compatibility with the rated assembly before installation.

Application Instructions

1. Remove the required amount of Metacaulk Putty from the package.

2. Mold the putty by hand to fit around the penetration or opening.

3. Apply around cables, electrical conduits, metal pipes, electrical boxes, or approved penetrations.

4. Press firmly to ensure complete contact with surrounding surfaces.

5. Confirm the penetration is fully sealed according to the tested firestop system.

Important Notes

• Do not expose to water.

• Install only according to tested and approved firestop systems.

• Follow manufacturer installation instructions and applicable building codes.

• Designed for passive fire protection applications only.

• Store in a clean, dry location until use.

Product Information

Property	Description
Brand	Metacaulk
Product Type	Moldable non-curing firestop putty
Color	Red
Application	Firestopping around cables, conduit, metal pipes, electrical boxes, and blank openings
Recommended Use	Small openings, EMT pipe, steel, conduit, cabling, and electrical boxes
Fire Rating	Up to 3 hours in approved systems
Test Standards	ASTM E 814, UL 1479, and ULC/CAN4-S115-M
Sound Rating	STC 60 with putty pads
Shelf Life	2 years
Case Weight	11.88 lbs
Case Dimensions	Height: 6.38 in × Length: 5.38 in × Width: 11.25 in
UPC	021449663458

 

Frequently Asked Questions (FAQ)

Q1. What is Metacaulk Putty used for?
Metacaulk Putty is used to seal around cables, electrical conduits, metal pipes, electrical boxes, and other penetrations in fire-rated walls and floors to help prevent the spread of flames, smoke, and toxic gases.

Q2. How does Metacaulk Putty work during a fire?
When exposed to high temperatures, the intumescent material expands and forms an insulating char that helps maintain the fire resistance of the assembly.

Q3. Does Metacaulk Putty require mixing or special tools?
No. Metacaulk Putty is a one-component material that can be molded and installed by hand without mixing, additives, or specialized equipment.

Q4. Is Metacaulk Putty suitable for occupied spaces?
Yes. The solvent-free formulation contains no volatile solvents or asbestos fillers, making it suitable for occupied and confined spaces.

Q5. What fire rating does Metacaulk Putty provide?
When installed in approved systems, Metacaulk Putty can provide up to a 3-hour fire rating. Putty pads also provide an STC rating of 60 for sound control.