1. ABSORPTION
   Materials that absorb noise have an open fibrous structure that allows sound to enter. The internal strands or fibers of the material vibrate, and the resulting mechanical movement dissipates the energy in the form of a minute amount of heat. Absorbing materials are used to reduce the reverberant noise build-up from inside buildings, rooms, working spaces or equipment housings.
2. BLOCKING
   Blocking materials provide a barrier to noise. Blocking materials do not absorb or deaden noise, but rather block the direct path of the noise by reflecting it away from the receiver. Performance is based on the mass and density of the material. The greater the mass and density, the better the barrier. Blocking materials can be used as a barrier to enclose the noise source or as a barrier to enclose the potential receiver of the noise.
3. DAMPING
   Damping materials reduce noise radiation from metal surfaces by damping the vibration of the metal. This applies to both continuously radiating surfaces as well as those with intermittent metal impact. Damping materials are applied directly to the surface of a vibrating structure and will convert the mechanical vibrating energy of the surface to heat. The minute flexing of the damping material provides the energy dissipation to reduce noise. The materials are a cost-effective way to eliminate the ringing sound of vibrating sheet metal or the irritating impact noise in conveyor chutes or bins.

Features

• McGill AirSilence's Soundscreen acoustical ceiling and wall baffle (ACWB) is a scrim-wrapped, highly efficient, tuned baffle designed for mid to low frequency noise absorption. The ACWB consists of a semi-rigid fiberglass core completely encapsulated within a 2-mil-thick, reinforced foil/polypropolene cover.
• The ACWB is available in standard sizes up to 4 feet by 8 feet, and in thicknesses of 1 inch (ACWB-1) and 2 inches (ACWB-2). NRCs are 0.75 and 0.94, respectively, when tested in a number 4 mounting (direct mounted). The ACWB has flame spread and smoke spread developed ratings of 5 each making them suitable for applications requiring low flame and smoke emissions.
• These board-like baffles provide good structural integrity and are damage resistant. They can be used in temperatures ranging from -40°F to 450°F.

Fire Retardant

Soundscreen wedge foam is made specifically to absorb reverberant noise in manufacturing plants, offices, and recreational facilities.

The foam's patented wedge shape provides 450 percent more surface area to absorb noise than the flat surface of regular foam. The wedge shape is also a design element; it creates a clean and modern look when installed. The extra surface area and aesthetic appeal of wedge foam make it an ideal noise control solution for public area. Custom colors are available.

The frequency of noise to be controlled determines how thick the foam should be. Lower frequency noise is controlled best with thicker foam. Refer to the Sound Absorption Coefficient chart to see how 2- and 4-inch-thick foams behave when subjected to various noise frequencies.

Installation is easy. Use a utility knife to cut the foam on its flat side, then attach it to walls or partitions with a fast-tacking contact cement.

Installation

Typcial resonating vibration noise applications:

Typcial impact noise applications:

Installation:

Installation:

• SOUNDSCREEN ACOUSTICAL LINING PROVIDES ABSORPTION AND DAMPING
  Soundscreen Acoustical Lining combines several basic noise control materials into a simple, multi-layered, acoustical composite material. Two basic linings satisfy most applications: absorbing foam plus noise barrier, and absorbing foam plus damping. Acoustical liners convert bare metal into effective noise enclosures by adding the right combination of sound deadening material to the inside surfaces.
• PRODUCT SELECTION
  • Foam/Vinyl/Foam Barrier Lining: This barrier lining is available with 1 lb/ft² density loaded vinyl and is the same as the inner septum layer. This lining material is excellent for building factory partitions. Adhered to 1/4-inch plywood, the material provides approximately 50 dBA transmission loss at the critical 1000 and 2000Hz frequencies — equivalent to the noise reduction of an 8-inch masonry block wall!
  • Foam/Damping Lining: Foam/Damping is a sheet of absorbing foam bonded to a layer of 0.062-inch-thick Soundscreen LD-400 damping material. The material reduces the humming noise associated with vibrating sheet metal, as well as controls the reverberant noise inside cabinets or equipment covers.
  • As a combination of materials, each layer of the product serves a specific function. The 0.062-inch-thick layer of LD-400 damping material effectively controls radiation noise in metal up to 16-gauge thickness. The damping material is bonded directly to the metal structure for maximum effectiveness. The 1-inch thickness of acoustical foam faces the noise source so that it can absorb reverberant noise.

• SOUNDSCREEN PNEUMATIC SILENCERS CONTROL EXCESSIVE EXHAUST AIR NOISE
  Control valves create a blast of noise when exhaust air is released directly to the atmosphere. Soundscreen Pneumatic Silencers control that excessive noise by reducing the velocity and turbulence of the exhaust air flow.
  
  Simple and easy to apply, the silencers screw directly into the exhaust port of the control valve. A Pneumatic Silencer can reduce the noise from a single exhaust port from 90 dBA to about 60 dBA. That reduction is significant. Ninety dBA corresponds to the noise of a heavy truck passing just a few feet away while 60 dBA is equivalent to normal conversation at a smiliar distance. Specific noise reduction varies with each application's size, working pressure, and exhaust configuration.
• Shatterproof Nautre Increases Plant Safety
  Soundscreen Pneumatic Silencers have been tested at 200 psi. The maximum recommended working pressure and temperature is 150 psi and 165°F. An additional safety factor is the shatterproof nature of the silencer material. The porous body is made from tough, high-density polyethylene. The solid threaded base, made from the same grade polyethylene, is welded to the body to form an integral single piece unit. In the event of an accidental blow, the resilient, high density polyethylene prevents the silencer from shattering and sending dangerous fragments flying.
• Low Maintenance
  Maintenance is usually unnecessary. The porous body of the silencer is made by the same powder sintering process used in making filter materials for gases and liquids. Moderatley clean air and water will pass through the Soundscreen Pneumatic Silencer, eliminating the problem of excessive clogging. Should cleaning be required, a solvent with low flammability such as methylene choloride, is recommended.
• Availability
  All sizes are available for shipment from stock. Soundscreen Pneumatic Silencer model dimensions are shown below.
  

  Nozzle Sizes
  Part Number	Size	Weight
  ATN-18A	1/8" NPT	1 oz
  ATN-14A	1/4" NPT	2 oz

• Factory Tested, 85 dBA Performance
  A few thousandths variation in slot gap can cause wide variations in air consumption and noise levels of nozzles. Soundscreen High Thrust Air Nozzles are individually tested and permanently set at the factory to obtain maximum thrust at an OSHA acceptable 85 dBA noise level for line pressures between 10 and 80 psig. This is a "close in" (two feet) noise level. For intermittent operation or for further distances away, the total noise exposure is significantly less.
  
  Useful air thrust is delivered even when the nozzle is placed some distance away. Performance over distance with 60 psig is shown in the chart below.
  

  Air thrust performance over distance at 60 psig
  Distance	ATN-18A	ATN-14A
  3"	11.1	11.5
  8"	10.2	11.0
  15"	9.2	10.2