9mm- 12mm-18mm-24mm Polyester Fiber Acoustic Panels - LinkedIn

When choosing acoustic panels, the thickness of the material plays a critical role in its sound-absorbing performance. Although the difference between 4mm and 24mm panels may seem subtle, the impact on sound absorption is significant. Today, we’ll explore the acoustic performance differences between polyester fiber panels of various thicknesses, helping you make an informed choice for your next project.

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Comparison and Analysis of Acoustic Performance for Different Thickness Panels (based on Type A Installation）(The data is collected from the authoritative results obtained by professional acoustic testing institutions in reverberation chambers according to international standards ISO 354. The random incidence sound absorption coefficient and other indicators in the frequency range of 100Hz - Hz are measured for 9mm, 12mm, 18mm, and 24mm polyester fiber sound-absorbing panels without an air layer (Type A installation). The test environment and process variables are strictly controlled to ensure that the data can accurately reflect the acoustic characteristics of the sound-absorbing panels.)

Samples are:

9mm thickness, g/m2

12mm thickness, g/m2

18mm thickness, g/m2

24mm thickness, g/m2

(I) Frequency Response

A. In low-frequency band (100Hz - 500Hz)，the Sound Absorption Coefficient of different thicknesses correspond to the following：

9mm: 0.1 - 0.2

12mm: 0.1 - 0.2

18mm: 0.1- 0.45

24mm: 0.1- 0.64

In the low-frequency band (100Hz - 500Hz), as the thickness of the polyester fiber sound-absorbing board increases, the sound absorption coefficient generally rises.

However, the sound absorption coefficients of the 9mm and 12mm boards in this frequency band are similar (ranging from 0.1 to 0.2). The enhancement becomes significant starting from the 18mm board, with the 24mm board reaching 0.1 - 0.64. This indicates that there is a threshold effect of thickness on the improvement of sound absorption performance in the low-frequency range.

Boards with a thickness of 18mm and above have obvious advantages, which are beneficial for dealing with low-frequency noises such as those generated by the operation of large equipment and the low-frequency rumble of vehicles. For example, in scenarios like industrial plant noise reduction and transportation hub sound insulation, it can enhance acoustic comfort and noise reduction effects.

B. In the mid-frequency band (600Hz - Hz)，the Sound Absorption Coefficient of different thicknesses correspond to the following：

9mm: 0.2- 0.7

12mm: 0.3 - 0.8

18mm: 0.6- 0.99

24mm: 0.75- 1

In the mid-frequency band (600Hz - Hz), there is still a positive correlation between thickness and the sound absorption coefficient.

The coefficient of the 9mm board is 0.2 - 0.7, and that of the 24mm board reaches 0.75 - 1. The mid-frequency band is crucial for language clarity and the performance of the mid-frequency range in music quality.

C. In the high-frequency band (Hz - Hz)，the Sound Absorption Coefficient of different thicknesses correspond to the following：

9mm: 0.7- 0.94

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12mm: 0.8 - 0.98

18mm: 0.99- 1

24mm: 1- 0.99

In the high-frequency band (Hz - Hz), although the sound absorption coefficient of each thickness board increases with the increase of thickness, the difference is smaller compared to that in the mid and low frequencies.

High-frequency noises mostly originate from the high-frequency vibrations of electronic equipment and instruments. Although thicker boards have an improvement in high-frequency sound absorption, the marginal benefit is decreasing.

(II) Sound Absorption Coefficient

Calculate the average sound absorption coefficient of each thickness panel.

9mm: αw 0.25

12mm: αw 0.25

18mm: αw 0.45

24mm: αw 0.5

There is a strong positive correlation between thickness and sound absorption coefficient, reflecting the gradual change of sound absorption ability.

(III) Installation Simplicity&Cost - Benefit

We know that the thicker the panel, the higher the price.

If you want to improve low-frequency noise and your budget allows, you can choose the 24mm panel.

If the budget is limited, you can opt for the 9mm panel in TYPE200 mounting method.

Data shows that with the TYPE200 mounting method, the 9mm panel can achieve a sound absorption coefficient between 0.69 and 1 in the 100-500Hz frequency range.

III. Recommended Application Places

(I) 9mm Panel

• Small Office: Absorb high-frequency noise from computer equipment and personnel conversations, reduce reverberation, improve speech clarity, and create a comfortable acoustic environment for office work, optimizing communication efficiency and employee comfort.
• Home Room: Improve the noise of household appliances such as televisions and stereos, adjust the acoustic atmosphere of bedrooms and living rooms, achieve basic sound absorption function within a limited budget, and enhance the acoustic quality of living.

(II) 12mm Panel

• Conference Room: Balance the sound absorption of medium and low-frequency noise, suppress echoes from conference speeches and low-frequency humming of equipment, ensure clear speech and efficient discussions, and provide excellent acoustic conditions for conference communication.
• Multi - function Hall: Adapt to the audio environment of various activities, such as speeches, performances, and training. The medium and low-frequency sound absorption controls the reverberation time and improves the acoustic adaptability and functionality of the space.

(III) 18mm Panel

• Music Classroom: The strong low-frequency sound absorption performance effectively deals with the low-frequency resonance of musical instruments and the low-frequency components of teaching voices, creating a precise acoustic space for music teaching and practice, protecting students' hearing and improving teaching effects.
• Recording Studio: Fine-tune the acoustic environment to capture pure audio signals for recording workers and avoid low-frequency noise interference. It is the core material for building a professional recording acoustic space.

(IV) 24mm Panel

• Concert Hall: Provide outstanding acoustic support for top-level music performances. The excellent low-frequency sound absorption precisely shapes the fullness and layering of music, creating an immersive acoustic experience and becoming an acoustic art palace.
• Theater: Deeply handle the low-frequency sound effects on the stage and the acoustic feedback in the audience area. The thick panel has excellent low-frequency sound absorption and moderate high-frequency performance, balancing the acoustic energy distribution throughout the venue and improving the viewing experience.

IV. Conclusion

Polyester fiber sound absorbing panels of different thicknesses under TYPE A MOUNTING have distinct acoustic characteristics and clear application scenarios. The low-frequency sound absorption increases with thickness, while the high-frequency difference is small.

The installation is simple and efficient for all. The cost is positively correlated with thickness.

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