Project Description

blowerkitdB cloth is a sound absorbing cloth or fabric made with acoustical foams designed to provide maximum absorption of airborne sound with minimum thickness and weight. These flexible polyurethane open cell foam products are manufactured to optimize pore size, air flow resistance, and density.

Sound energy, passing through the cell structure, is converted into minute quantities of low-grade heat that is easily dissipated. Since the uniformity of the cells are carefully controlled the efficiency is constant and predictable from one installation to another.

Many applications require these sound blocking fabrics to be subjected to environments such as dirt, moisture, chemicals, and abrasion that could be hostile to an unprotected foam. These dB cloth’s go through various surface treatments to protect the integrity of the foam from these elements. These facings will increase the absorption properties of certain frequencies as well as provide a cleanable, decorative and durable finish for a wide variety of applications.

Acoustical kits are often the most cost-effective way to deal with noise in an OEM application. These parts are ready to install and usually have an aggressive pressure sensitive adhesive (PSA) for fast and permanent bonding. This particular part goes inside a blower housing and has a perforated outline. This allows the assembly personnel to remove a section easily when an optional bracket is installed.

 

dB Cloth sound barrier fabric samplesdB cloth Foams can be purchased in rolls or sheets.  They are easily cut with a knife, saw or scissors.  The addition of pressure sensitive adhesive provides a convenient method of fastening to most substrates.

dB cloth products can be made in combination with dB mat barrier systems when both absorption and transmission loss is needed, or VETM damping systems, when enhanced vibration control is required.

 

Polyester Physical Properties:

  • Color Charcoal Gray
  • Density 2lb/cft or 4lb/cft +/- 10% 32 kg/m3 or 64 kg/m3 +/- 10% per ASTM D3574-86 test A
  • Tear Strength 1.5 ppi per ASTM D3574-86 test F
  • Tensile Strength 20 psi per ASTM D3574-86 test E
  • Elongation 120% per ASTM D3574-86 test E
  • Compression Set % 50% Deflection Max 10% ASTM D357-86 test D
  • Heat Resistance retention of tensile strength after 22 hours dry heat aging at 140oC min. 70% ASTM D3574-86 test K
  • Humidity Resistance retention of tensile strength after 6 hours steam autoclave at 105oC min. 70% ASTM D3574-86 test J
  • Chemical Resistance good for common fluids, water, petroleum, solvents, and alkalis. Swelling will occur, will return to almost 100% after drying.
  • Flammability MVSS 302, UL-94 HF1, and FAR 25.853(b)
  • Service Temperature -40oF to +225oF continuous to 275oF intermittent
  • Thermal Conductivity BTU/hr., Ft2, oF/in. .25 per ASTM C 177

Standard Surface Treatments:

  • Aluminized Polyester
  • Reinforced Aluminized Polyester
  • Urethane Films (matte or impervious)
  • Tedlar® (trademark E.I. Dupont Co.)
  • Perforated Vinyl
  • Convoluted
  • Embossed
  • Customized Facings Available

Pressure Sensitive Adhesive:

  • Supported SBR (temps to 140oF)
  • Unsupported Acrylic (temps to 250oF)
  • Supported Acrylic (temps to 250oF)

Standard Sizes:

  • Rolls 54″ x 50′
  • Sheets 54″ x 72″, 54″ x 24″, 54″ x 36″ (minimum sheet order: 10 sheets)
  • Fabricated or Die Cut
  • Thicknesses 1/4″ – 2″
Thickness

Frequency (Hz)

125 250 500 1K 2K 4K NRC
.5″ .00 .08 .16 .55 .98 .95 .45
.75″ .01 .11 .38 .92 .93 .86 .60
1″ .06 .19 .74 1.00 .85 .97 .70
1.5″ .10 .30 .77 1.04 .99 1.11 .80

ASTM C423-90a       Absorption Coefficient

Polyether Physical Properties:

  • Color Charcoal Gray
  • Density 2lb/cft or 4lb/cft +/- 10% 32 kg/m3 or 64 kg/m3 +/- 10% per ASTM D3574-86 test A
  • Tear Strength 1.58 ppi per ASTM D3574-86 test F
  • Tensile Strength 13 psi per ASTM D3574-86 test E
  • Elongation 193% per ASTM D3574-86 test E
  • Compression Set % 50% Deflection Max 10% ASTM D35748-86 test D
  • Heat Resistance retention of tensile strength after 22 hours dry heat aging at 140oC min. 70% ASTM D3574-86 test K
  • Humidity Resistance retention of tensile strength after 5 hours steam autoclave at 120oC min. 70% ASTM D3574-86 test J
  • Chemical Resistance good for common fluids, water, petroleum, solvents, and alkalis. Swelling will occur, will return to almost 100% after drying.
  • Flammability MVSS 302, UL-94 HF1, and FAR 25.853(b)
  • Service Temperature -40oF to +225oF continuous to 275oF intermittent
  • Thermal Conductivity BTU/hr., Ft2, oF/in. .25 per ASTM C 177

Acoustical foam is the most versatile of all noise control materials. dB Engineering has the right foam for your application.

Effectiveness chart of Thickness of 4# Polyester Foam

 

Comparison chart of a soundproofing foam of 1 inch Thick Polyester Foams

 

Effect of Facing on 2 inch 2 pound Polyester acoustic foam

 

Comparison of 2 pound and 4 pound acoustic foam at one quarter inch thickness

 

Effect of Thickness on Plain two pound polyester acoustic foam