Nelson Firestop Brick

Nelson Firestop Brick

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Nelson Firestop Bricks are easy to install, easy to position, and ideal for applications where there might be a need to re-penetrate an area. When a brick comes into contact with fire, the brick material expands within the opening, forming a solid char that prevents through-penetration of the fire for up to 2 hours. Because of its versatility, this economical, durable, labor-saving firestop material is ideal for cable or cable tray penetrations.


Up to 2 hour ratings
Easily installed, can be cut to fit
Soft, pliable, in tumescent material
Easily regenerated
Non-shrinking, non-toxic
Excellent shelf life


 Application  To seal around junction boxes, flashings and service mast entries and general purpose sealant for a variety of purposes
 Color  Charcoal Gray
 Composition  Urea, Polymer with Formaldehyde, d-Glucitol, Furfuryl Alcohol, Ammonium Sulfate
 Form  Solid
 Manufacturer Part Number  AA834
 Standards/Approvals  UL1479|ASTM E814