3M™ Fire Barrier Block B258, Maroon, 2.36 in x 5.12 in x 8 in, 12/case
Product Info
97939 FR BRRR BLCK B258 MRN 2.36INX 5.12
3M Fire Barrier Block B258, Maroon, 2.36 in x 5.12 in x 8 in, 12/case; 1EA = 1EA; 1CS = 12EA
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.
- Pre-formed foam block maintains tight firestop seal to prevent fire, smoke and toxic gas transmission
- Fits medium to large openings in wall and floor through-penetrations
- No cure time means faster completion
- Block is paintable with primer
- Installation requires no special tools
- Can be repaired and reused as needed, saving time and labor
- Firestop tested in accordance with ASTM E 814/UL 1479
- Can be sealed with 3M™ Fire Barrier Rated Foam FIP 1-Step and other 3M™ fire barrier sealants (sold separately)
| Application | Commercial Construction |
| Color Family | Red |
| Fire Rating | 2 Hour |
| Overall Length (Imperial) | 8 in |
| Overall Length (Metric) | 203.2 mm |
| Overall Width (Imperial) | 5.12 in |
| Overall Width (Metric) | 13 cm |
| Product Color | Maroon |
| Product Form | Each |
| Product Key | FB258 |
| Product Number | FB258 |
| Product Type | Fire Barrier Block |
| ECCN | EAR99 |
Item Specifications
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1.23 lbs per EA
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