Does Polyurethane Foam Have Fiberglass? (Revealed!)

9 Min Read
Does Polyurethane Foam Have Fiberglass

Polyurethane is an incredibly popular material used for a variety of insulation applications, from foam insulation to fiberglass.

What makes it so versatile is the fact that there are different types of polyurethane that each possess unique properties and characteristics, allowing them to be used for a wide range of applications.

With its high durability and resistance to moisture, polyurethane has become an incredibly common choice for insulation projects. Its versatility and range of uses make it a must-have in any insulation project.

So, Does Polyurethane Foam Have Fiberglass?

The answer is no; Polyurethane foam does not contain any fiberglass. It is made of petroleum derivatives, blowing agents, surfactants, fire retardants, catalysts, and other additives.

These ingredients are combined to form the foam and provide its unique properties. However, it should be noted that some manufacturers may add fibers such as cotton or wool to the foam for additional comfort or durability.

Did you know that there are different types of polyurethane? Each type has its own unique properties, and some can be used on fiberglass?

Open Cell Polyurethane:

Open cell polyurethane is a type of foam commonly used in bedding, furniture, and insulation. It is made of a combination of polyol and isocyanate chemicals that create a soft, spongy foam.

Open cell polyurethane does not contain fiberglass, unlike some other types of foam which are made with fiberglass for added stability. Open cell polyurethane is lightweight, breathable and resistant to water and dust mites, making it an ideal choice for many applications.

Closed Cell Polyurethane:

Closed cell polyurethane foam is a type of foam that does not contain fiberglass or any other type of glass material. It is made from a combination of different chemicals, including polyols and isocyanates, and is highly resistant to water and other liquids.

Closed cell polyurethane foam is often used in insulation, bedding, and furniture products. It has numerous advantages over traditional foam materials including being lightweight, durable, and flame-resistant.

Furthermore, its closed-cell structure allows it to be easily cut into shapes and sizes for custom projects.


Thermoplastics are a type of plastic that can be melted and reshaped. Polyurethane foam is a type of thermoplastic that is commonly used in furniture and bedding, but does it contain fiberglass? The answer is no, polyurethane foam does not contain fiberglass, but instead contains polyester fibers, polyethers, and other chemicals.

This makes polyurethane foam durable and more resistant to fire and heat than other plastics. It also makes it ideal for upholstery and cushioning in furniture and mattresses.

Rigid Foam:

Rigid foam is a type of polyurethane foam that is used for insulation, cushioning, and other applications. Unlike flexible foam, which is made from polymers, rigid foam is created by combining polyurethane with fiberglass.

This combination of materials makes rigid foam highly durable and resistant to water, fire, and chemicals.

As a result, it is often used for insulation in buildings and various industrial applications. Additionally, rigid foam can be formed into various shapes, allowing for greater versatility than other types of foam.

Is polyurethane a fiberglass?

Polyurethane foam is widely used in construction, furniture, and other applications, but does it contain fiberglass? The answer is no. Polyurethane foam is a synthetic material that does not contain any natural fibers such as fiberglass.

While it can be reinforced with glass fibers, this is not necessary to create the desired properties of the foam. However, in some cases, manufacturers may choose to add glass fibers to the foam to increase its strength and durability.

Do foam mattresses have fiberglass in them?

Yes, some foam mattresses may contain small amounts of fiberglass for added durability. While this is not typically the case with open cell polyurethane foam, closed cell polyurethane foam may contain fiberglass as a result of its chemical composition.

Can you use polyurethane on fiberglass?

Yes, you can use polyurethane on fiberglass, but it is not typical. Polyurethane foam is made of a combination of polyol and isocyanate chemicals, which create a soft, spongy foam.

While this combination may be suitable for some applications, it is not typically used to coat fiberglass because of the potential for damage. Instead, other materials like urethane or silicone are more commonly used to coat fiberglass.

How do you apply polyurethane to fiberglass?

Applying polyurethane to fiberglass is a relatively easy process.

  • First, it is important to ensure that the surface is properly prepared. This includes ensuring that the surface is clean and free of any dirt or debris.
  • Next, the polyurethane can be applied using a brush, roller, or sprayer.
  • Once applied, the foam should be allowed to cure for several hours before being exposed to water or any other elements. This will ensure that the foam has properly adhered to the fiberglass surface and will provide a strong bond between the two materials.

Can you use polyurethane as fiberglass resin?

Yes, you can use polyurethane as a fiberglass resin. Polyurethane is a synthetic material that is similar to fiberglass in terms of properties and composition. As a result, it can be used to create composite materials that are both lightweight and durable.

Can you fiberglass over polyurethane?

No, you cannot fiberglass over polyurethane. Polyurethane is a soft, spongy material that is not typically suitable for use in fiberglass applications. Instead, other materials like urethane or silicone are more commonly used to coat fiberglass.

Additionally, polyurethane may not adhere well to fiberglass, which could lead to potential damage.

Can you fiberglass over foam?

The answer to this question is yes; it is possible to fiberglass over foam, provided it is the correct type. Polyurethane foam can be used for fiberglassing, as long as it is dense enough and does not contain other materials such as fiberglass.

If the foam contains fiberglass, then it cannot be fiberglassed over, as the fiberglass will interfere with the process. When using polyurethane foam for fiberglassing, it is important to use the right tools and techniques to ensure a successful result.

What kind of foam can I use with fiberglass?

Polyurethane foam sands well and is a good choice for applications that require a strong but lightweight substrate.

It is not typically used for applications that require a delicate surface, such as fiberglass. Instead, other materials like urethane or silicone are more commonly used.


There are many benefits to using polyurethane foam on your fiberglass house panels. Not only does it provide excellent thermal resistance, but it also protects the surface from wear and tear.

Polyurethane foam does not contain any fiberglass, but it does contain other materials like polyester and polyether that help increase its insulation properties.

Its breathable nature makes it a suitable choice for use in many different applications, from furniture to insulation. It is also a cost-effective material that is known for its durability and flexibility. Overall, polyurethane foam is a great material for its many uses and benefits.

Share this Article
Leave a comment

Leave a Reply

Your email address will not be published. Required fields are marked *