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DFARS Specialty Metals
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Fire-Stop Electrical Box Inserts
Seal electrical boxes to maintain fire-resistant walls. These inserts mount inside electrical boxes to block the spread of smoke and flames. When heated, they expand to seal gaps, such as those left by melted wire. They fit common box sizes.
Use gaskets when cable or switches have already been installed. They sit just inside your cover plate.
Use pads before cable is installed. The adhesive side sticks to the back wall of your electrical box. They can be used only with metallic boxes.
Gaskets

For NEMA Outlets

For GFCI Outlets
For Toggle Switches
Each
| Industry Designation | For No. of Outlets | For No. of Toggle Switches | Lg. | Wd. | Thick. | Application Temperature, °F | Fire Rating, hrs. | Flammability Rating | Specifications Met | Each | |
For NEMA Outlets | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 Gang | 2 | __ | 5" | 5" | 1/8" | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 00000000 | 00000 |
| 2 Gang | 4 | __ | 5" | 5" | 1/8" | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 00000000 | 0000 |
For GFCI Outlets | |||||||||||
| 1 Gang | 1 | __ | 5" | 5" | 1/8" | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 00000000 | 0000 |
| 2 Gang | 2 | __ | 5" | 5" | 1/8" | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 00000000 | 0000 |
For Toggle Switches | |||||||||||
| 1 Gang | __ | 1 | 5" | 5" | 1/8" | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 00000000 | 0000 |
| 2 Gang | __ | 2 | 5" | 5" | 1/8" | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 00000000 | 0000 |
Package
| Industry Designation | For No. of Outlets | For No. of Toggle Switches | Lg. | Wd. | Thick. | Application Temperature, °F | Fire Rating, hrs. | Flammability Rating | Specifications Met | Pkg. Qty. | Pkg. | |
For NEMA Outlets | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 Gang | 2 | __ | 5" | 5" | 1/8" | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 50 | 00000000 | 0000000 |
| 2 Gang | 4 | __ | 5" | 5" | 1/8" | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 50 | 00000000 | 000000 |
For GFCI Outlets | ||||||||||||
| 1 Gang | 1 | __ | 5" | 5" | 1/8" | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 50 | 00000000 | 000000 |
| 2 Gang | 2 | __ | 5" | 5" | 1/8" | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 50 | 00000000 | 000000 |
For Toggle Switches | ||||||||||||
| 1 Gang | __ | 1 | 5" | 5" | 1/8" | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 50 | 00000000 | 000000 |
| 2 Gang | __ | 2 | 5" | 5" | 1/8" | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 50 | 00000000 | 000000 |
Pads


Each
| Industry Designation | Lg. | Wd. | Thick. | Mount Type | Application Temperature, °F | Fire Rating, hrs. | Flammability Rating | Specifications Met | Each | |
| 1 Gang | 1 13/16" | 2 13/16" | 1/4" | Adhesive Back | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, ASTM G21, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 00000000 | 00000 |
| 2 Gang | 3 3/4" | 3 11/16" | 1/4" | Adhesive Back | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, ASTM G21, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 00000000 | 0000 |
| 2 Gang | 4 3/8" | 4 3/8" | 1/4" | Adhesive Back | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, ASTM G21, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 00000000 | 00000 |
Package
| Industry Designation | Lg. | Wd. | Thick. | Mount Type | Application Temperature, °F | Fire Rating, hrs. | Flammability Rating | Specifications Met | Pkg. Qty. | Pkg. | |
| 1 Gang | 1 13/16" | 2 13/16" | 1/4" | Adhesive Back | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, ASTM G21, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 50 | 00000000 | 0000000 |
| 2 Gang | 3 3/4" | 3 11/16" | 1/4" | Adhesive Back | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, ASTM G21, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 50 | 00000000 | 000000 |
| 2 Gang | 4 3/8" | 4 3/8" | 1/4" | Adhesive Back | 40° to 120° | 2 | ASTM E84 5/5 for Flame and Smoke, UL 723 5/5 for Flame and Smoke | ASTM E90, ASTM E119, UL 263, ASTM E814, UL 1479, ASTM G21, CAN/ULC-S101, CAN/ULC-S102, CAN/ULC-S115, FM Approved | 50 | 00000000 | 000000 |

























