ResoNix Fiber Mat 45 – 45mm Thick Self-Adhering Hydrophobic Sound Absorber & Decoupler

1/14/2023 Product Update: ResoNix Fiber Mat now comes with press sealed edges all around.

ResoNix Fiber Mat 45 is a 45mm (+/- 1mm) automotive sound absorbing mat that is comprised of hydrophobic polypropylene fibers featuring an automotive-grade peel-and-stick adhesive on one side, and is used in aftermarket automotive installations to serve a few purposes. First, to absorb any incoming external noise, such as wind, tire, and road noise. Second, to decouple one panel from another. It can also act as a superior air gap/decoupling layer for a noise barrier such as ResoNix Barrier. And lastly, it is a great heat insulator, with an R-Value of 7.15. Due to the material it is comprised of, it is naturally hydrophobic and is completely mold/mildew resistant. This can be used anywhere in a vehicle without worry.

ResoNix Fiber Mat features an automotive-grade adhesive to allow for an easy and lifetime-lasting install. ResoNix Fiber Mat is an absorber that works via the microscopic fibers that convert the passing acoustic energy into mechanical energy (the moving of the fibers) and thermal energy, from the friction of moving through the scattered fibers. It being so soft and plush also offers it to not just being an automotive sound absorbing mat, but also acts as an excellent decoupler that can be used in doors, rear decks, and anywhere else you can fit it. It is a better decoupler than any Closed Cell Foam on the market as it is extremely soft and compliant and is highly suggested to be used on any larger panels. Due to the nature of the product, we still offer our CCF7 to handle the decoupling of small panels and to spot-treat certain areas.

How does it work? Here is an excerpt from our Reference & Information Guide..

 First, sound absorption happens when you convert acoustic energy into another form of energy, such as mechanical or thermal. It only makes sense to use a soft, fibrous or porous absorber in a vehicle, so we will stick with how those work. The fibrous materials absorb sound by deforming randomly at a microscopic level as sound passes through. The porous materials absorb sound by creating friction against sound waves as they pass through.

What makes our products better than the rest? Click here for a detailed run down on why ResoNix is the best option.

Where should ResoNix Fiber Mat be used?

Fiber Mat 45 Installation Suggestions: 

Roofs/Headliners – This is going to be the most common area to use for Fiber Mat 45. Use here to absorb and eliminate the largest source of wind noise, the roof. This will also slightly help improve low-frequency transient response in vehicles being built for high-end sound systems. In some vehicles, Fiber Mat 45 may not fit here. In this case, use Fiber Mat 25.

• Doors – Please note, this is only for some vehicles. Most will only be able to fit Fiber Mat 25 – In between door panels and the inner door skin as a decoupler, replacing commonly used closed cell foam to eliminate pesky rattles from the doors. It also acts as an absorber here for outside wind/tire/road noise, as well as astray midbass frequencies from door-mounted speakers. 

Rear Quarter Panels – Apply, or even stuff Fiber Mat 45 into rear quarter panel areas to absorb outside noise entering into the cabin.

Wheel Wells – Since this product is able to withstand water, feel free to use this on the inside of your fender liners (on the side that is NOT not exposed to the wheels), or on the metal body of the wheel well. This will greatly reduce noise from tires and wind from entering the cabin. (Tip – also use ResoNix Barrier in conjunction here for even further noise reduction from wheel wells).

Rear Decks – In between rear deck panels and the metal underneath. This serves as an excellent decoupler here to eliminate rattles which cause muddy and distracting bass from trunk-installed subwoofers. This is split 50-50 between what cars can fit Fiber Mat 45 and Fiber Mat 25 in our experience. Use 45 if you can fit it. 

Interior Firewalls – Once again, due to it being able to fit in tight areas, Fiber Mat 25 is the perfect choice to fit on an interiors firewall to absorb noise and block heat from entering the cabin from the engine bay. This is also split 50-50 between which cars can fit Fiber Mat 45 and which ones can only fit Fiber Mat 25 in our experience. Use 45 if you can fit it.  

Remember, every car and every application is different. This is only a list of suggestions based on our experience. What may work best for your situation may be different. It is up to you to figure out what can fit in your vehicles locations. Fiber Mat 45 is always a better choice if it can fit, but the above locations usually have tighter tolerances in which only Fiber Mat 25 will fit within. 

 Things to note.

•  
• . Hydrophobic and mold/mildew resistant. Water is of no concern for this product.
•  
• . Cutting the product with heavy duty scissors is very easy. This is fine, but if agitated, this can cause fibers to pull out of the opening. Do NOT cut with a razor blade or box cutter. It will not cut cleanly. High-quality scissors only. 
•  
• . Use INSIDE of doors on outer door skins at your own risk. 

Specifications

. 45mm thick at rest and can compress down to about 7mm

. 54″ x 36″

. R-Value: 7.15

. All edges now come sealed. Cutting with scissors is perfectly fine and will create a sealed edge in most cases. Even if it doesn’t, the material will be okay and moisture will still not be an issue

. Adhesive backed for easy installation

. Sound Absorption Coefficient tested to ISO 354 standards