Soundproof material

Melamine foam, a special form of melamine, is used as an insulating and soundproofing material and as a cleaning abrasive. 

Coconut fibre or coir has many uses. It is used to make rope and yam, aquarium filters, car seat covers, flower pots, used as a soundproofing material, as mulch for plant growing, to provide heat insulation, to make bmshes, bristles, mattresses, door mats, matting, mgs, [hand knotted carpets]. 

The polyimide foams are flexible and have a very low density (7 kg/m ), associated with good fire behaviour, a broad service temperature range and good soundproofing and thermal insulation qualities. These materials are sensitive to diluted strong bases, concentrated salts and acids. Other foams have densities varying from 15-250 kg/m. ... 

Materials for roads Tunnel wall, soundproofed wall, traffic signs and reflectors... 

The acoustic properties of polymers are altered in a cellular structure. Sound transmission changes only slightly, because it depends predominantly upon the barrier density, in this case the polymer phase. Therefore, closed-cell cellular polymers by themselves are poor materials for reducing sound transmission. They are, however, effective in absorbing sound waves of certain frequencies [64]. Materials with open cells on the surface are particularly effective in this respect. The combination of other advantageous physical properties with fair acoustic properties has led to the use of plastic foams in soundproofing [65,66]. The sound absorption of a number of cellular polymers has been reported [7,64,65,67]. 

Materials for air cleaning Self-Cleaning, Antibacterial Room air cleaner, Photocatalyst-equipped air conditioners and interior air cleaner for factories. Outdoor air purifiers Concrete for highways. Roadways and footpaths. Tunnel walls. Soundproof walls and building wahs... 

Former arguments against the use of textile membranes with respect to their durability, thermal insulation and soundproofing are no longer valid today, as these issues can be addressed by using the latest appropriate materials with the application of most modem construction techniques. 

Because of its low specific weight, balsa wood (ca. 140 kg/m ) is often used as a core material. Extruded foams with a density between 30 and 110 kg/m are also often used as internal core materials (Fig. 15.8), particularly as they have good insulation and soundproofing qualities. It is also possible to manufacture foam plates for use as core materials. However, adhesion to the covering layers is problematic. 

Crushers Installation in enclosed sound-insulated buildings, preferably below floor level. Open side of building facing away from adjacent residents, if possible. Receiving hopper for stone tipped from trucks to have rubber lining and, preferably, a "cushioning" layer of material kept permanently in it. Soundproofed control cab for operating personnel. 

---