Slip Stream 24/7 – Global Supply and Distribution Company providing 3M Industrial, Commercial & Safety Solutions
English Spanish
SKU 7000031967
Legacy SKU 98040056073
UPC 00051115549007
Part Number MORTAR
Product Number MORTAR

3M™ Fire Barrier Mortar is a lightweight, gypsum-based powder that mixes with water to form a heat-absorbing firestop for through penetrations in fire-rated floor or wall assemblies. Versatile mortar can be mixed self-leveling or non-sag, and adheres to a range of construction substrates and penetrants. It also acts as a heat sink, reducing the chance of fire on unexposed sides of the assembly.

  • Ready-to-mix pumpable mortar is deal for firestopping large annular spaces and floors
  • Lightweight mortar designed to absorb heat, reducing chance of combustion on unexposed sides
  • Polypropylene-fiber reinforced powder mixes with water for self-leveling or non-sag applications
  • Contains no asbestos, MMMF or halogens
  • Firestop tested for up to 3 hours in accordance with ASTM E 814 (UL 1479) and CAN/ULC-S115
  Add to cart
On it's way to you October 5   


Minimum Order 40 Bags
Order Increment 40 Bags
  Immense Fire Resistance
  Residential & Commercial Buildings
  Fast, Global Shipping
  Industry Low Price
Product Dimensions
Imperial Metric
Shipping Dimensions
Weight 44.414 lb
Length 24 in
Width 15 in
Height 4 in
Color Off-white


  1. What is 3M™ Fire Barrier Mortar used for?

    3M™ Fire Barrier Mortar is used to help prevent the spread of fire, smoke and noxious gas through penetrations in fire-rated walls and floors.

  2. How does this product compare to other fire barrier mortars on the market?

    3M™ Fire Barrier Mortar has a high-quality, lightweight formula that makes it easier to apply than some competing products. Additionally, our mortar offers a rapid curing time, meaning that it can be painted or coated just four hours after application.

  3. Is this type of mortar safe to use around people?

    Yes! When installed according to the manufacturer's directions, 3M™ Fire Barrier Mortar creates a completely non-toxic protective layer that doesn't release any gasses or fumes during installation or combustion.

  4. How much area will one bag of 44 lb. 3M™ Fire Barrier Mortar cover?

    The answer here really depends upon factors such as your application method and thickness preferences; however, we generally recommend using about five cubic feet per bag (which should cover roughly a six-inch diameter opening).

For industrial/occupational use only. Not for consumer sale or use.
3M industrial and occupational products are intended, labeled, and packaged for sale to trained industrial and occupational customers for workplace use.  Unless specifically stated otherwise on the applicable product packaging or literature, these products are not intended, labeled, or packaged for sale to or use by consumers (e.g., for home, personal, primary or secondary school, recreational/sporting, or other uses not described in the applicable product packaging or literature), and must be selected and used in compliance with applicable health and safety regulations and standards (e.g., U.S. OSHA, ANSI), as well as all product literature, user instructions, warnings, and other limitations, and the user must take any action required under any recall, field action, or other product use notice.  Misuse of 3M industrial and occupational products may result in injury, sickness, death, or property damage.  For help with product selection and use, consult your on-site safety professional, industrial hygienist, or other subject matter expert.
A Firestop that Can Take the Heat

For mechanical and electrical through penetrations where the penetrants may generate heat, 3M™ Fire Barrier Mortar provides a ready-to-mix solution. This gypsum-based mortar acts as a heat sink, absorbing heat from penetrants and reducing the chances of combustion inside firestopped floor and wall assemblies.

Recommended Applications
  • Firestopping and sealing mechanical and electrical service penetrations
  • Blank openings and large annular spaces
  • Floors and other applications requiring self-leveling material
  • Vertical and horizontal substrates requiring non-sag adhesion
Fully Tested and Approved

3M™ Fire Barrier Mortar is firestop tested up to 3 hours in accordance with ASTM E 814 (UL 1479) and CAN/ULC-S115 when installed in listed systems, including 2-1/2" (63.5 cm) minimum thickness concrete floors. It is also tested in accordance with AS1530.4, EN1366 and ASTM E814 (UL Listed) and has proven self-bonding during fire testing.

Easy and Safe to Use

The firestop mortar comes ready to mix with potable water, making it fast and cost-effective. The versatile material can be mixed to a thinner consistency for self-leveling applications such as floors, or as a non-sag material for vertical walls. It adheres well to a range of common construction materials including concrete, metals, wood, plastic, and cable jacketing. The mortar is pumpable as well, resulting in faster work times and lower labor costs. It cleans easily with water. Polypropylene-fiber reinforced material reduces cracking during cure time. The cured material is paintable after priming. It is also re-enterable, allowing technicians to easily access components after installation with a common hole saw.

This mortar contains no asbestos, halogens, Portland cement, or MMMF and requires no fibrous damming materials or procedures.

The Science of Better Fire Protection from 3M

Since 1925 when a 3M lab assistant invented masking tape, 3M has been applying science to life – developing adhesive products and technologies that help entire industries and individual businesses worldwide. The work that began with a single 3M engineer now spans decades and generations. And all of it goes into each adhesive, sealant, protective coating, and firestop material like 3M™ Fire Barrier Mortar – to improve performance and to help businesses like yours operate faster, better, and more efficiently.

Brochures, Catalogs & Data Sheets
Other Products in this Family

Lead times are estimates and may vary based on our suppliers' product availability.