Is Closed Cell Foam Flammable: Debunking the Myth

Is Closed Cell Foam Flammable?

When it comes to insulation materials, one question that often comes up is whether closed cell foam is flammable. Many homeowners and builders are concerned about the fire safety of the materials they use in their projects. In this article, we will explore the flammability of closed cell foam and discuss its fire-resistant properties.

Understanding Closed Cell Foam

Closed cell foam is a type of insulation material that is commonly used in building projects. It is made up of small, enclosed bubbles that form a rigid and dense structure. This type of foam is known for its excellent insulation properties, high resistance to water absorption, and durability.

Flammability of Closed Cell Foam

Closed cell foam is inherently fire-resistant due to its chemical composition. The foam is made up of polymer materials, which are known for their high ignition temperature and low heat release rate. This means that closed cell foam is less likely to ignite and burn when exposed to flames.

In addition to its chemical composition, closed cell foam also contains fire retardant additives. These additives further enhance the material’s fire-resistant properties by slowing down the combustion process and reducing the spread of flames.

Fire Safety Certifications

Closed cell foam insulation products undergo rigorous testing to ensure their fire safety. They are tested against industry standards to determine their flammability and ignition properties. If a closed cell foam meets the necessary criteria, it may receive fire safety certifications from recognized organizations.

One such certification is the ASTM E84 Class 1 rating, which indicates that the foam has low flammability and is suitable for use in residential and commercial buildings. This rating assures homeowners and builders that the closed cell foam they are using is fire-resistant and meets industry standards.

Is Closed Cell Foam Flammable: Debunking the Myth


Is Closed Cell Foam Flammable: Debunking the Myth


Benefits of Using Fire-Resistant Insulation

Choosing closed cell foam insulation for your building projects offers several benefits when it comes to fire safety:

  • Reduced fire hazards: Closed cell foam is designed to resist the spread of flames, reducing the risk of fire hazards in your home or building.
  • Increased escape time: In case of a fire, the fire-resistant properties of closed cell foam can provide occupants with valuable extra time to escape the building.
  • Improved structural integrity: Closed cell foam can also help enhance the structural integrity of buildings by reducing the risk of fire-related damage.

Frequently Asked Questions On Is Closed Cell Foam Flammable: Debunking The Myth

Is Closed Cell Foam Flammable?

Closed cell foam is not flammable as it has a high resistance to heat and does not easily ignite.

Can Closed Cell Foam Catch Fire?

Closed cell foam has a high fire rating and is considered very safe in terms of fire resistance.

What Makes Closed Cell Foam Fire-resistant?

The closed cell structure of the foam makes it difficult for fire to penetrate as it traps air and slows down heat transfer.

Is Closed Cell Foam Safe To Use In Homes?

Closed cell foam is widely used in homes as insulation material for its fire-retardant properties, making it safe for residential applications.


In summary, closed cell foam is not flammable and has excellent fire-resistant properties. Its chemical composition, as well as the addition of fire retardant additives, make it a safe and reliable choice for insulation projects. When using closed cell foam, be sure to look for fire safety certifications to ensure that you are choosing a high-quality and fire-resistant product for your building needs.

Updated: January 4, 2024 — 9:16 pm