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Firestop:

  Biostop 350i
  Biostop Putty Pads
  Biostop Wrap Strip
  Bio Firestop Pillows



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    Biostop® 350i


Biostop® 350i is a one component, general purpose fire rated sealant and smoke seal for construction joints and through-penetrations. It is a intumescent, water based, non sag caulking grade sealant that is easy to apply as well as to retrofit. It cures to an elastromeric seal that is suitable where dynamic movement is expected.

  • STC rating 53, teested in a UL 411 wall assembly/section to ASTM E90.
  • Complies to Required Environmental Exposure Testing of Accelerated Aging and High Humidity as per UL 1479 Fire Test of Through-Penetration Firestops.
  • US Patent Number 6,207,085.
Prod.# Description Packaging
RE 66620 Biostop® 350i10.3 oz tube
RE 66622 Biostop® 350i30 oz tube
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    Biostop® Putty Pads


BIOSTOP® Fire Rated Intumescent Putty Pads are used to maintain the hourly rating of fire rated walls containing electrical outlet boxes and to reduce sound transmission.

Only one pad thickness (1/8 inch) is required for a 1 or 2 hour fire rating. No additional putty material needed to plug end of each electrical metallic tube or conduit as its connection to the box. Required by Building Codes in rated partitions where horizontal separation of opposite facing electrical boxes is less than 24 inches (horizontally).

STC Rating 60*. (*Tested in a UL 411 wall assembly/section to ASTM E90.)

Prod.# Description Dimensions
RE 66490 Biostop® Putty Pads6" x 7" x 1/8"
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    Bio Firestop Pillows


Bio Firestop Pillows are intumescent and designed for use primarily in large openings with cables, cable trays, blank openings or multiple penetrating items. For temporary or permanent applications.

Prod.# Description Dimensions
RE 66418 Bio Firestop Pillows3" x 9" x 6"
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    Biostop® Wrap Strip


Biostop® Wrap Strip is a flexible strip of highly intumescent firestop material used primarily for plastic and insulated pipe applications. When exposed to heat, this product expands greatly and forms a strong char to seal off the penetration by preventing the passage of flames and hot gases.

Complies to Required Environmental Exposure Testing of Accelerated Aging and High Humidity as per UL 1479 Fire Test of Through-Penetration Firestops. US Patent Number 6,207,085.

Prod.# Description Dimensions
RE 66436
Special Order
Biostop® Wrap Strip2" x 1/4" x 12'
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