Intumescent thermoplastic electrical box
Protect the small openings that can compromise a fire-rated wall.
The FireBlok Firestop Gasket is an intumescent thermoplastic electrical box insert used as a membrane penetration firestop to maintain the fire-resistant ratings of 1- and 2-hour fire walls. The insert is certified for both 1 & 2 hour, U300, U400, V400 and U411 wall assemblies with metal electrical boxes with plastic or metal cover plates according to the ASTM E119/E814 standards for fire resistive wall openings.
Electrical boxes are essential, but every membrane penetration introduces a firestop detail that must be solved. FireBlok Gasket gives OEM teams, fire protection engineers, architects, distributors and contractors, a compact, pre-formed intumescent firestop material that adheres to the back of the box, supports fire partitioning for commercial buildings, and helps simplify field installation.
Support building code firestop solution requirements with a certified electrical box fire gasket for 1 and 2 hour fire-rated walls.
The insert is easily applied by hand, adheres to the back of the electrical box, and is pre-scored for snapping to fit specific box sizes.
When exposed to heat, the intumescent material expands to help create a high-performance fire seal around the penetration.
Specify one component across common box formats instead of redesigning every wall cavity fire protection detail from scratch.
FireBlok Gasket includes soundproof performance with an STC Rating 52, tested to ASTM E90.
The insert is warranted for the life of the building when stored below 130ºF / 54ºC before installation.
FireBlok Gasket is designed around a simple story: install it before the wall is closed, let the material stay passive during normal use, and rely on intumescent expansion when elevated temperature threatens the assembly.
Apply the insert by hand inside the metal electrical box.
Use the pre-scored break-apart.
Expansion begins at 300ºF / 148ºC during a fire event. The material expands more than 20 times to help protect the wall cavity and compartmentation barrier.
FireBlok Gasket is specified for metal electrical box membrane penetrations in fire-rated construction materials where predictable passive fire protection systems matter.
Certified for both 1 and 2 hour U300, U400, V400 and U411 wall assemblies with metal electrical boxes and plastic or metal cover plates.
Soundproof with an STC Rating 52.
Expansion begins at 300ºF / 148ºC and the material expands more than 20 times its original size.
Tested to ASTM E90 Standard.
White
2.1 cu. in.
30
120
20+ times its original size
3-3/4 in. x
3-3/4 in. x 3/8 in.
Speak with Pyrophobic’s fire protection specialist team about your project, listing pathway and OEM integration needs. For purchasing, FireBlok Gasket is available through Orbit Electric.
FireBlok Gasket is an intumescent thermoplastic insert used as a membrane penetration firestop in metal electrical boxes. It helps maintain the fire-resistant rating of wall assemblies.
Electrical boxes can weaken compartmentation fire barriers when they penetrate fire-rated walls. FireBlok provides a pre-formed intumescent firestop material that helps protect the wall cavity around the box.
It can be used in 1-gang boxes, 4 in. square boxes and 4-11/16 in. square boxes.
Yes. It is certified for both 1- or 2-hour U300, U400, V400 and U411 wall assemblies with metal electrical boxes and plastic or metal cover plates.
Yes. It is certified for both plastic and metal faceplates in all fire-rated walls.
Yes. FireBlok is listed with an STC Rating 52 and was tested to ASTM E90 Standard.
Expansion begins at 300ºF / 148ºC. The material is highly intumescent and expands more than 20 times its original size.
FireBlok is a building code firestop material for electrical box membrane penetrations. For UL 1479 / ASTM E814 tested system questions, verify the exact listed system, wall assembly and AHJ requirements with the Pyrophobic team before submittal.
FireBlok Gasket is positioned for fire-rated wall assemblies with metal electrical boxes. For ASTM E119 ceiling fire resistance or other horizontal assembly requirements, contact Pyrophobic to confirm the applicable listed system.
FireBlok Gasket is available through Orbit Electric.
Talk to Nick and Clarke.
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