Product Description

The STI SpecSeal® EP Powershield™ Electrical Box Insert is a one-component intumescent pad designed for use inside electrical switch and receptacle boxes.
It installs directly against the back wall of the box and expands up to 24× its original size when exposed to fire, quickly sealing off flames, smoke, and gases.
The insert features a peel-and-stick adhesive backing for easy, tool-free installation in new or existing walls.

Key Benefits

• High Expansion – Expands 16–24× under fire for reliable firestop performance.
• UL Certified – Tested to UL263 / ASTM E119, rated up to 2 hours in gypsum wallboard assemblies.
• Easy Installation – Peel-and-stick adhesive, no tools or cure time required.
• Retrofit-Friendly – Can be installed in existing walls and boxes.
• Non-Conductive & Safe – Designed for use inside electrical boxes, with no mess or residue.
• Labor Saving – Installs before or after wallboard installation with minimal effort.

Packaging

• Sizes: EP44 (95 × 95 mm), EP45 (114 × 114 mm), EP55 (124 × 124 mm)
• Color: Red
• Thickness: 1/8” (3 mm)
• Case Qty: EP44 – 20 pcs, EP45 – 20 pcs, EP55 – 250 pcs (bulk options available)
• Shelf Life: No limit when stored below 130 °F (54 °C)