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Are there different grades of felt?
Table of Contents
- What Does Felt Thickness Really Change grades of felt?
- 9mm vs 12mm vs 24mm Felt Panels (Quick Comparison)
- When Should You Choose 9mm?
- When Is 12mm the Best Choice?
- When Do You Really Need 24mm?
- Is Thicker Felt Always Better?
- Real Acoustic Performance (What the Data Says)
- How to Place Felt Panels for Better Results
- What Makes a Good Acoustic Felt Panel
- Final Thoughts
When you are preparing to use sound-absorbing felt to improve acoustics, a multitude of questions can suddenly flood your mind. If you want to reduce noise in your office, Are there different grades of felt?
If you are live-streaming from home and notice an echo—prompting you to consider installing acoustic felt—but you don’t want the walls to become too bulky, how do you make the right choice?
Once you’ve identified your needs and approach felt manufacturers, you might discover that their product specifications are incredibly numerous—seemingly endless—and that prices vary wildly.
At this point, you’re bound to ask yourself: how exactly do I select the felt that is right for me, and how do I determine the appropriate thickness?
This matter can seem complex, yet in reality, it is quite simple. For instance, for some spaces, 9mm is sufficient; others require 12mm; and for some, even 20mm isn’t enough.
From this, you should realize that while thickness is indeed important, it is never the sole determining factor.
Therefore, choosing a thickness isn’t merely about picking a number; rather, it involves making a practical judgment: determining exactly how thick the material needs to be to be just right.
Below, we will walk you through this issue step by step to clarify everything.
What Does Felt Thickness Really Change grades of felt?
Before you rush to select a thickness, let’s first clarify one fundamental point:
Prior to choosing a thickness, you must first understand your primary motivation for increasing it. Are you seeking superior soundproofing, or do you simply assume that thicker felt automatically performs better?
However, thickness also affects aesthetics and spatial perception.Are there different grades of felt?
Sound Absorption Frequency Range
The purpose of acoustic felt is not to completely block sound from the outside, but rather to absorb the sound present within the space.
Thinner felt absorbs high-frequency sounds such as speech and keyboard noise.
Thicker felt is better for deeper and more resonant sounds.
Spatial Perception and Design
If the material is too thin, the effect may be minimal.
If too thick, the space can feel cramped and visually heavy—especially in offices or commercial environments.
Cost and Installation
Thicker materials increase cost, shipping, and installation difficulty.
For light noise reduction, choosing the thickest option is not always optimal.
9mm vs 12mm vs 24mm Felt Panels (Quick Comparison)
| Thickness | Best For | Sound Performance | Recommendation |
| 9mm | Homes / Decoration | Absorbs High Frequencies | Moderate Noise Reduction |
| 12mm | Offices / Commercial Spaces | High Frequencies + Some Mid-Frequencies | ⭐ Most Popular Choice |
| 24mm | High-Noise / Professional Spaces | High Frequencies + Mid-to-Low Frequencies | High-Demand Environments |
In most cases, 12mm is sufficient.
When Should You Choose 9mm?
The 9mm thickness is suitable for most people who only need basic improvement.
It helps reduce echo and soften uncomfortable sounds without making the space feel heavy.
Ideal for homes and small spaces with low acoustic requirements.
When Is 12mm the Best Choice?
For offices, meeting rooms, and commercial spaces, 12mm is the most practical option.
It provides a balance between performance and cost.
It effectively reduces echo, improves speech clarity, and minimizes background noise.
When Do You Really Need 24mm?
24mm is designed for specialized environments such as:
High-noise spaces
Recording studios
Music production rooms
It performs better in mid-to-low frequency absorption.
However, it also comes with higher cost and takes up more space.
Is Thicker Felt Always Better?
No.
For standard environments like homes or offices, thicker felt does not always improve performance.
Sound absorption depends on:
Thickness + Coverage Area + Layout
A well-designed 12mm setup is often better than poorly placed 24mm panels.
Real Acoustic Performance (What the Data Says)
Under ASTM C423 testing:
NRC: 0.70 – 0.95
Increased thickness improves mid-to-low frequency absorption
Most sound is absorbed rather than reflected, making the space quieter and clearer.
How to Place Felt Panels for Better Results
Placement is often more important than thickness.Are there different grades of felt?
Prioritize Reflection Surfaces
Focus on walls facing sound sources, central wall areas, and ceilings.
No Need for Full Coverage
Covering 30%–60% of the wall is usually enough.
Dispersed Placement vs Concentration
Even distribution works better than placing panels on one wall.
What Makes a Good Acoustic Felt Panel
Not all felt panels are the same.
High-Density Fiber grades of felt
Provides stable and consistent sound absorption.
Uniform Structure
Ensures better sound absorption through even pores.
Advanced Heat Press Technology
Improves durability and long-term performance.
Final Thoughts
Choosing felt thickness is not about selecting a number，Whether it’s felt or wool felt,—it’s about finding the right solution for your space.
Light improvement → 9mm
Most cases → 12mm
High-demand → 24mm
More importantly:
Thickness + layout = real performance
When done correctly, your space becomes quieter, clearer, and more comfortable.
You may also like this guide to quality differences.