Is Fiberglass Flammable? 

This article will answer the question, is fiberglass flammable? It also covers several topics about flammability, the advantages of using fiberglass, and the applications of fiberglass.

Is Fiberglass Flammable?

Fiberglass is classified as a non-flammable material. However, that doesn’t mean that fiberglass won’t melt. Fiberglass is rated to withstand temperatures up to 1000 degrees Fahrenheit before it melts.

What Is Flammability?

A flammable substance is any material that, when placed into contact with air, has the potential to catch fire.

Combustible materials can be divided into two categories: those that are Highly Flammable and those that are Extremely Flammable. Extremely flammable substances have a flash point of 0 degrees Celsius, while their boiling point is about 35 degrees Celsius. 

This substance, which is generally a gas when cooled to room temperature, is maintained at very high pressure inside a tube completely sealed off from the outside atmosphere. 

The following is a list of some of the categories that might be utilized when classifying flammable materials:

  • The chemical ignites in a relatively short amount of time. Consider the chemical compound known as aluminum alkyl phosphorus, for example. 
  • There is a substantial risk of ignition when gases are present. Butane and propane are two excellent illustrations of this. When working with this chemical, you must keep a safe distance from any sources of ignition as well as air.
  • Compounds that produce flammable gases when exposed to water or fire are known to be sensitive to moisture. Combustible gas-generating chemicals are known as water-sensitive compounds.

Fiberglass insulation is deemed non-flammable since it is constructed of glass and will not burn.

What Is Fiberglass?

Fiberglass is a composite material created by mixing excellent glass filaments with a resin mixture, which is often polyester.

The composite material itself is a material that is made up of two different components. These components are a reinforcement in the form of fiber and a binder in the form of plastic. 

The combination of these two components results in a material that is rigid, strong, and lightweight.

Glass fibers were initially utilized in wool insulation production after being mixed with polyester resins. This combination results in the creation of a long-lasting composite and makes it possible for fiberglass to be utilized in a wide variety of industries all over the world.

The material known as fiberglass is not only lightweight but also long-lasting and robust. Additionally, fiberglass can withstand impacts, is resistant to corrosion, and has a moderate strength-to-weight ratio. 

Because of its malleability, fiberglass may be shaped into a wide variety of furniture, including that used in residential and commercial settings. Because it is made of an insulation material that can withstand high temperatures, fiberglass is an effective heat barrier with a high value.

What Are the Applications of Fiberglass?

Reservoir Tank

The holding tank can also be constructed out of a material composed of woven mat or filament wound fiber, with the fibers being orientated in a direction perpendicular to the circumferential pressure applied to walls by the contents of the tank.

Because the plastic covering, which is often composed of polypropylene, is resistant to a wide variety of powerful chemicals, tanks of this sort are typically utilized for storing chemicals. Septic tanks are another common application for fiberglass storage tanks.

Building Construction of Homes

In addition, roofing laminates, door surrounds, canopies above doors, window canopies and dormers, chimneys, coping systems, fireplace cladding, and window frames are all constructed using glass fiber plastics. These materials are utilized in the building industry.


It is possible to utilize fiberglass piping systems for a variety of different sorts of scenarios that are located above or below ground, such as the following:

  • A water supply for use in extinguishing fires
  • System for wastewater and culverts
  • Gas supply system
  • Cooling water piping
  • Drinking water piping

Another application for fiberglass is the production of sheets that may be used for making electrical insulators and other structural components frequently used in the field of power generation.

Its applications have since spread into the domains of automobiles, sporting goods, and aircraft models. However, its utilization in aircraft models have been partially replaced by carbon fiber materials, which are lighter per volume but stronger in volume and weight.

In telecommunications, fiberglass is also utilized to cover the visible portions of antennas on the outside of devices. This is a result of its capability to absorb radio frequencies and its capacity to lessen the possibility of low-level messages being transmitted.

How Does Fiberglass Perform When Exposed to Heat?

Fiberglass has excellent resilience to heat. It maintains more than half of its tensile strength at temperatures up to 675 F and more than 25% at temperatures up to 875 F. At temperatures between 1500 and 2050 F, it will lose its rigidity and eventually melt.


Because it is composed of sand and glass, fiberglass is not a material that can support combustion.

Frequently Asked Question (FAQs): Is Fiberglass Flammable?

Is fiberglass a more durable material than steel?

Fiberglass is a more robust material than either steel or aluminum. When choosing a body for a vehicle, strength is an essential factor to consider, even though it isn’t the sole factor. After all, it is an issue of safety and long-term durability.

Does fiberglass explode?

A substance known as methyl ethyl ketone peroxide serves both as the catalyst and the hardener. This presents a severe risk because it is combustible and has the potential to explode, and it is also exceedingly harmful to the eyes and the skin. 


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