一、Middle- and high- frequency sound-absorbing structure

A、Original brick metope and rendering (or light division wall)

B、Light-steel keel or wooden keel of 50mm or 75mm.

C、Glass wool panels in 50mm or 75mm. (density: 24-32kg/m3)

D、Perforated LCFC (NALC) panels of 5-8mm thick, with fiberglass cloth or yarn free cloth or sound-absorbing paper pasted inside, and coatings or sound transparent cloth on the exterior surface.

Generally, the perforating rate is greater than or equal to 16%. If the perforating rate is from 8 to 12% under middle- or high- frequency conditions, the high- frequency sound-absorbing performance will be influenced. If the perforating rate is between 4 and 6%, the low-frequency sound-absorbing performance is preferable and the middle- or high- frequency ones are of a sort.

二、Wide-frequency sound-absorbing structure

 A、Original brick metope and rendering (or light division wall)

 B、Light-steel keels or steel & wood assembled keels

C、Cavum in 50mm, 75mm or 100mm.

D、A layer of steel net

E、Thick centrifugal glass wool panels in 50mm or 75mm thick. (density: 24-32kg/m)

F、Perforated LCFC (NALC) panels in 5-8mm thick, with fiberglass cloth or yarn free cloth or sound-absorbing paper pasted inside, and paint coated on the exterior surface.

When the perforating rate is greater than or equal to 16%, the low-frequency performance will be improved compared to Chart one.

三、Low-frequency sound-absorbing structure

A、Original brick metope and rendering (or light division wall)

B、Light-steel keels or wooden keels

C、Vacuum in 50mm, 75mm or 100mm long.

D、The inside is covered with a layer of fiberglass cloth or yarn free cloth.

E、Low- perforating rate LCFC (NALC) panels in 5-8mm thick, and 0.5-4% perforating rate.

四、Wide frequency sound-absorbing structure

A、Original brick metope and rendering (or light division wall)

B、Light-steel keels and vacuum in 50mm, 75mm or 100mm long.

C、Perforated LCFC(NALC) panels in 5-8mm thick and 20% perforating rate.

D、Fully covered with burn-resistance and sound-absorbing panels with 25mm or 50mm thick.

五、Low- and middle- frequency sound-absorbing structure

A、Original brick metope and rendering (or light division wall)

B、Keels in 50mm or 75mm thick, centrifugal glass-wool sound-absorbing layer (Density: 32-48kg/m3)

C、Polystyrene film or PVC film

D、Perforated LCFC (NALC) panels in 5-8mm thick and 8-12% perforating rate.

The surface is covered with coatings or sound-transparent cloth.

Sound insulation wall body

一、Single-side composite division wall with 60db sound-insulation quantity.

A、Double-stuccoed brick wall (solid or hollow wall in 120mm or 240mm thick)

B、Light-steel keels of 50mm or 75mm thick, with 50mm or 75mm thick centrifugal glass wool panels or mineral wool panels filled inside.

C、LCFC (NALC) panels of 10mm-12mm thick.

二、Double-side composite light division wall with 70db sound-insulation quantity.

A、LCFC(NALC) panels of 10mm-12mm thick.

B、Light-steel keels of 75mm thick with 75mm thick centrifugal glass wool (Density:18kg/m3) or mineral wool panels (Density: 80kg/m3) filled inside.

C、LCFC (NALC) panels of 10mm-12mm thick.