Acoustical board

A successful factory-applied intumescent paint has been developed by the Celotex Corp. for application to acoustic board. In addition, a satisfactory package paint, Due-Tex flame-retardant paint, is available for application over old fiberboard installations, wood, etc. This product bears an Underwriters Laboratories label. 

Acoustical board 9- ku-stik or -sti-kol-) n. A low-density, sound-absorbing structural insulating board having a factory-applied finish and a fissured, felted-fiber, slotted or perforated surface pattern provided to reduce sound reflection. Harris CM (2005) Dictionary of architecture and construction. McGraw-Hill Co., New York. 

For special applications such as air coupled testing a special programmable transmitter board was developed. This transmitter generates rectangular and burst signals, which increase the acoustical power in an optimized frequency range, and provides a superior signal-to-noise ratio. 

West Pharmaceutical Services Plant in Kinston, North Carolina, 29 January 2003, and CTA Acoustics Manufacturing Plant in Corbin, Kentucky, 20 Februaiy 2003. Reference U.S. Chemical Safety Board (CSB) www.csb.gov/index.cjmPfolder = completed investigations bpage = info INV LD=34 and ID = 35... 

Many simple and complex treatments have been devised through the years to increase the fire and flame resistance of vegetable and wood fiber acoustical title by impregnating the board with the treatment or forming the board in the presence of the treatment. 

All the above formulations have been investigated and evaluated on perforated and unperforated Celotex fiberboard. Results demonstrate that a satisfactorily formulated intumescent water- or oil-base paint is the best type of paint to apply to acoustical fiber board to secure optimum fire or flame resistance. These paints, by their intumescent nature, tend to close the openings in the acoustical fiber board and insulate the basic fiber under the coating. 

Just because a paint itself will not burn, it does not follow that it will produce desirable fire or flame resistance on an acoustical fiber board. 

In addition to possessing the desired fire and flame resistance, the acoustical fiber-board paints and finishes must possess other requirements of an acceptable paint and finish. 

Rigid Rigid foams are used for both heat and acoustic insulation. They can be hand- or machine-processed or, alternatively, they can be sprayed on. They also can be used for buoyancy. They are used as insulation in walls and ceilings as well as in surfboards to provide the structure for the board. Their uses are varied and are limited by the imagination of the designer. 

Rigid insulation board (includes wallboard and softboard) 0.15-0.40 9.5-25.0 Heat and sound insulation as sheathing, interior paneling, base for plaster or siding, thick laminated sheets for structural decking, cores for doors and partitions, acoustical ceilings... 

Because TSM oscillators have been around for over 50 years, quite a number of circuits to measure their response have been proposed, fabricated, and tested. The frequency of operation of TSM resonators (typically < 20 MHz) allows circuits to be constructed using ordinary components and printed circuit boards. Instruments and fixtures are commerciaUy available from a number of vendors (see Appendix D) that utilize fairly simple oscillator circuits incorporating the TSM resonator as the principal fiequency-control element. These systems are sold primarily for monitoring the deposition of metal films via evaporation or sputtering in a vacuum environment. The operator must typically input the density and acoustic impedance of the metal to be deposited, and the instrument then displays film thickness as deposition proceeds. These systems can also be utilized for gas-phase sensing applications, provided the TSM device is not coated with any particularly lossy materials these can cause so much damping that oscillation ceases. The systems provide information derived only from the resonant frequency there is no indication of damping except in the instance that oscillation ceases entirely. 

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