3M Fire Barrier Block
3M Fire Barrier Block B258, Maroon, 2.36 in x 5.12 in x 8 in, 12/Case
3M Fire Barrier Block B258, Maroon, 2.36 in x 5.12 in x 8 in, 12/Case
3M Fire Barrier Block
3M Fire Barrier Block B258, Maroon, 2.36 in x 5.12 in x 8 in, 12/Case
3M Fire Barrier Block B258, Maroon, 2.36 in x 5.12 in x 8 in, 12/Case
3M Fire Barrier Block
3M Fire Barrier Block B258, Maroon, 2.36 in x 5.12 in x 8 in, 12/Case
3M Fire Barrier Block B258, Maroon, 2.36 in x 5.12 in x 8 in, 12/Case
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3M Products & Supplies

3M Fire Barrier Block B258, Maroon, 2.36 in x 5.12 in x 8 in, 12/Case

Sold As: 12-Pack
SKU: 7010305974
MPN: 7010305974
For an accurate lead time please contact us
UPC: 00076308979393
3M ID: 98-0441-1000-9
5 Digit UPC: 97939
Country of Origin: Germany
Manufacturer: 3M
Size: 5.12 in
Color: Maroon
$402.55 ($33.55 / Count)
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Product Description  
3M Fire Barrier Block B258 is a pre-formed foam block designed for easy installation to effectively seal larger openings against smoke, toxic gas and flame. It is simple to use and helps reduce sound transmission.

A Better Way to Fill Large Gaps
When sealing larger cavities, use 3M™ Fire Barrier Block B258 to restore the integrity of the wall with a simple "stack, seal, and done" application, without the use of special tools. The blocks are engineered to remain securely in place, eliminating traditional wire mesh reinforcements. Pre-formed blocks help technicians fill large openings quickly. The material is easy to trim on site without special tools, achieving a tight, custom fit. No cure time is required, which means installation is completed faster, and the blocks are paintable with primer for a more seamless appearance.

The blocks are fully re-enterable and reusable, saving time and money, while minimizing waste. Once the opening is filled, seal around the perimeter and any penetrating items with 3M™ Fire Barrier Rated Foam FIP 1-Step or other 3M™ fire barrier sealants (sold separately).

Recommended Applications
  • Blank openings
  • Metal pipes
  • Cables
  • Cable trays
  • Insulated pipes, combination penetrations

Fully Tested and Approved
3M™ B258 Fire Barrier Blocks are firestop tested to the criteria of ASTM E 814/UL 1479 Standard Test Method for Fire Tests of Penetration Firestop Systems, ASTM E 84/UL 273 Standard Test Method for Surface Burning Characteristics of Building Materials, ASTM E 90 Standard Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements, and ASTM E 413 Classification for Rating Sound Insulation.

Reliable and Affordable Fire Protection
Effective and easy to install, 3M™ Fire Barrier Block B258 are part of our family of fire protection products that offer the broadest, long-lasting solutions for a variety of commercial, industrial and residential applications. As a trusted leader in the fire protection industry, 3M offers a broad line of affordable products designed to meet the most demanding firestop requirements. Find the solution you need from the industry-preferred line of fire protection products.

Extra Details

  • Block is paintable with primer
  • Can be repaired and reused as needed, saving time and labor
  • Can be sealed with 3M Fire Barrier Rated Foam FIP 1-Step and other 3M fire barrier sealants (sold separately)
  • Firestop tested in accordance with ASTM E 814/UL 1479
  • Fits medium to large openings in wall and floor through-penetrations
  • Installation requires no special tools
  • No cure time means faster completion
  • Pre-formed foam block maintains tight firestop seal to prevent fire, smoke and toxic gas transmission

Data Sheet

  1. Tech Data Sheet
  2. Safety Data Sheet

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