1. The difference between soundproofing and sound-absorption:

In essence, soundproofing and sound absorption are two different concepts, we need to clearly distinguish these two concepts to apply them optimally.

• Soundproofing is the blocking of sound, preventing sound from traveling from one space to another, the purpose of reducing the volume transmitted through spaces. Commonly used soundproofing materials are solid, high-density materials such as cast iron, steel, glass, concrete, young rubber, XPS foam, etc.

• Sound-absorption, also known as sound absorption, sound absorption, the purpose of improving the sound quality available in the space, making the sound clearer and more realistic. Sound-absorption is the use of a material with many porous, breathable holes so that when the sound enters, it is trapped and converts part of the sound energy into heat energy.

• With the information in the table below, JDesign has compiled basic information to differentiate between sound insulation and sound absorption. These brief information will help you have the most overview and easily apply them in your space:

2. Commonly used soundproofing and sound-absorbing materials:

• Each type of soundproofing and sound-absorbing material has the ability to absorb sound in different frequency ranges, in order to choose the right material for the space you need to pay attention to some of the following factors:

- What is the usable space?

- What materials are the ceilings and walls made of?

- How much space is needed to process the sound?

- What kind of sound is needed to be processed, at what frequency?

- What is your budget around?

• Popular types of soundproof materials include:

  - Soundoff Isophon soundproof wood panel is a multi-layer soundproof board with a single layer of high-density rubber core with a light weight of only 8kg/m2 (15mm thick), a variety of finishes (veneer, melamine or laminate) according to request. The standard sheet size is 1220x2440mm, the thickness is from 15-20-30-35mm. Soundoff Isophon panels are popularly used in the shipping industry to make flooring, cabins, partitions, ... in addition, they are also used as soundproof wooden bones thanks to their light weight.

- Soundoff Barrier 3-layer soundproof sheet is a multi-layer composite material with 2 surface layers of PP fiber-reinforced cement board and the middle core is a shock-absorbing rubber layer. Standard sheet size 1220x2440mm, thickness from 6-8-10-12mm, average weight about 18-25kg/m2. Soundoff Barrier sheet with a thickness of only 15mm has sound insulation equivalent to a wall layer of 220mm thick, combined with the advantages of fireproof and good waterproofing, this is a specialized soundproofing product for ceilings, walls and walls.

- Soundproof floor damping springs are made up of 2 main components: a rubber outsole from regenerative tires 18 or 25mm thick and a spring pad made of high-quality alloy, which can normally withstand compressive force from 50-200kg/piece. Is a good elastic spring, good load bearing, suitable for soundproofing, damping for music room, movie theater, karaoke, dance hall,... Standard size 120x120x80mm.

- Rockwool mineral wool is produced from 2 main ingredients, Basalt and Dolomite, undergoing melting and centrifugal spinning into small, porous cotton fibers; surface covered with wire mesh, glass cloth mesh, foil depending on the purpose of use. With excellent sound insulation and superior fire and heat resistance, Rockwool is often used for places requiring heat insulation, sound insulation and fire resistance such as halls, conference centers, cinemas, hospitals, industrial plants, etc. Rockwool mineral wool has two forms of packaging:

*) Rockwool roll roll size from 3000-9000mm, thickness 25-100mm.

*) Rockwool Thailand in standard size 1200x600mm, thickness 50-75-100mm.

- Glasswool glass wool is made from fused calcium silicate, which is passed through a centrifuge to turn into a thin, golden fiber like wool. This is a heat-insulating, non-combustible material, designed to reduce echo noise by up to 7% and reduce heat radiation entering the roof space by up to 97%, so it is used in residential, commercial metal roofing, industry. Glasswool cotton meets fire resistance level A, with a standard thickness of 25-30-50mm.

JDesign distinction table has summarized the basic information of soundproofing materials:

• Common types of sound-absorbing materials include:

  - Sound-absorbing wood wool panels are made from birch wood fibers combined with inorganic cement glue through the pressing process to become a product with extremely good absorption coefficient ~1, super insulation, weight. In addition, wood wool panels are diverse in size with a thickness of 15-18-25mm and the color palette is like a decorative accessory, creating a highlight for the space.

- Acoustic Sonic Sound Absorber Sheet is a fiber product pressed from recycled polyester plastic, light weight, diverse in shape and color, making it easy to cut, install and construct. The product has the ability to absorb mid- and high-frequency sounds of 0.94, high fire resistance and environmental friendliness. Standard sheet size 12010x2420mm thickness 9mm.

- Acoustic wall art murals are developed from Acoustic Sonic panels, further improved with custom prints, and print sizes on request. Sound-absorbing paintings provide a perfect visual and auditory experience, meeting all your requirements.

- Sound-absorbing wood with a surface from natural wood, veneer, MDF, Laminate, combined with Soundtex non-woven fabric backing with class B fire retardant standards, creates better sound absorption and provides better sound absorption at the same time. give space higher aesthetic value. Sound-absorbing wood is modularized into bars and panels for easy installation. To suit a variety of uses, sound-absorbing wood is developed into many types such as:

*) Perforated acoustic wood with a variety of colors and different coating materials, flexible perforation (parallel or staggered) will meet the maximum design requirements. With diverse sheet sizes 600x600mm, 600x1200mm or according to order requirements; thickness 9-12-15-18mm; The diameter of the sound hole is 3-6-8mm.

*) Vertical groove sound-absorbing wood is a product with a unique design style with flexible grooves (parallel or staggered). Various sheet sizes 600x600mm, 600x1200mm or according to the order requirements; thickness 9-12-15-18mm; Sound absorption groove size 60x6/8mm.

*) Grooved sound-absorbing wood in various designs (square or bar) with surfaces including grooving lines and perforated boards. To change the frequency converters that need to be silenced, simply change the groove size, or the depth of the hole board. When these hole boards are combined with panels (mineral wool, glass wool, ...) will create acoustic resonance. With standard bar size 120x2440mm, thickness 12-15-18mm, hole diameter 10mm, width 2-3-4-5mm sound absorption groove.

*) Square groove acoustic wood is a combination of the features of perforated and grooved acoustic wood with flexible grooving style (checkered or diamond shape). Standard plate size 600x600mm or to order, absorbing hole diameter 10mm, absorbing groove width 3/4mm.

*) Sound-absorbing wood Fineline Slats Acoustic is a sound-absorbing module with wooden slats of various sizes and materials designed to run in parallel, flexible, and easy to install. This product is mainly used for ceiling installation, with standard module 600x2400mm, wood thickness 15-18-25mm, wooden width 50-80-100mm.

*) Sound-absorbing Fineline Slats Horizontal has all the advantages of Fineline Slats and has a more flexible design option. In addition, the module size and the thickness of the wood do not change, but the width of the wood is smaller than 30-40-50mm, which will bring a more perfect and seamless space.

- Sound-absorbing foam is manufactured from PE Foam, has many different colors and shapes, such as round egg shape, pyramid spike shape, longitudinal wave zone... With low cost and construction Simply put, this is the most commonly used sound-absorbing material. Various sizes depending on the shape:

*) Sound-absorbing egg sucker in the frequency range of 80-10,000Hz: sheet size 1550x1950mm thickness 20-30-50mm.

*) The pyramid spikes absorb sound in the high- and mid-frequency ranges, especially low-level sound absorption below 500Hz: sheet size 500x500mm, thickness 50mm.

*) Metro-1 foam has the ability to minimize resonance and standing waves: plate size 500x500mm, thickness 50mm.

*) Metro-5 sucker has the ability to absorb mid-frequency sound, trap sound for ceilings and walls: sheet size 500x490mm, thickness 50mm.

- The curved sound-absorbing wood is composed of a surface layer of 3mm thick natural veneer that meets E0 standards, the sound-absorbing core is used Acoustic Sonic recycled acoustic panels that can arbitrarily create a wavy curved wall array. Standard size 2400x1200x12mm, wooden slat 28mm, groove 4mm. The product has completely solved the problem of acoustics of the building with the sound absorption coefficient NRC = 0.87, while ensuring the highest aesthetics for the building.

In the table below, JDesign summarizes and distinguishes the basic information of sound-absorbing materials:

The sound absorption coefficient (NRC) is a value representing the amount of sound that is suppressed or absorbed when a sound source is impacted on a surface. NRC=0 material has total sound reflectivity. NRC=1 is equivalent to total sound absorption.

3. Applications of soundproofing and sound absorption:

• Soundproofing is an important solution for special spaces with loud noises and strong vibrations that require damping such as bars, discos, karaoke. In order to provide an entertainment space with the highest sound quality, no noise, and limited influence on the surrounding area, it is necessary to focus on soundproofing the entire floor, walls, walls and ceiling.

• Sound absorption applications for spaces that require accurate sound, store live sound such as: offices (leader rooms, meeting rooms, ...), working studios (audio recording, recording, etc.) studio), and private offices. Sound-absorbing materials should be installed in positions that reflect sound and cause reverberation such as: the sides of the wall, the wall in front and behind the seat position, on the ceiling, etc., and for the best effect, the center point should be installed the sound-absorbing plate is level with the listener's ear.

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