Fabreeka® Pads

Fabreeka® resilient laminated fabric pad is a scientifically designed and manufactured material composed of layers of tightly twisted, closely woven lightweight duck. Each layer is impregnated with an elastomeric compound containing mold and mildew inhibiting agents. The properties of Fabreeka® are exceptionally suited for the reduction of impact shock, vibration and structure-borne noise.

Some features and benefits of Fabreeka® pads:

Do not have a shape factor Exhibit relatively high damping (C/Cc -.14) Creep effects are reduced to a limit of 5% of original thickness Operating temperature limits are -65°F (-55°C) to 200°F (95°C) Unusually high compressive strength - 12,000 psi Impervious to most oils and solvents Resist effects of steam, water, mildew and brine Can be supplied in nominal thicknesses of 1/16" (1.6 mm) up to 1" (25.4 mm) Thicker sections can be supplied by bonding standard thicknesses together Can be custom fabricated to any shape or size (see OEM section for samples of fabricated parts)

Some practical aspects and considerations when using Fabreeka® pads:

• Provides stability and limited motion
• Should be used with rigid support for best performance
• Connections to isolated system should be made flexible
• Avoid metal-to-metal contact in mount attachments by including Fabreeka® Bushings and Washers

Fabreeka® Properties and Technical Specifications

Strength and Compression

Fabreeka® will withstand loads between 10,000 psi (69MPa) and 20,000 psi (138 MPa) before breakdown, depending upon size and thickness of the pad. In general compressive stresses should not exceed 2,000 psi (13.8 MPa) for long life, freedom from set and high factor of safety. For higher stress levels, contact the Fabreeka® Engineering Department.

Compression

Fabreeka® is compressible due to its fabric construction and does not rely on flow, as a solid rubber pad does, to give necessary deflection. It substantially retains original length and width under compression and impact.

Set and Creep

One of the great advantages of Fabreeka® is the fact that increased deflection due to creep over long periods of time is limited to about 5% of the original thickness. When stresses are removed, permanent set is limited to about 5% of the original thickness. This explains the continued high isolating efficiency of Fabreeka® through long periods of continuous hard service.

Density

74 lbs/cubic foot(1185 kg/m³)

Compressive Modulus

Fabreeka's® load-deflection curve is nonlinear, therefore its modulus varies with load and is determined by:

M=1.5 X (stress/strain)

It approaches a maximum of 23,000 psi (158 MPa) at loads up to 2,000 psi (13.8 MPa).

As with compressive modulus, Fabreeka's® static spring rate varies with loading. The formula is:

K = M X (Af/Tf) or K = 1.5 X (Force/Deflection)

Damping

Fabreeka® has a high damping value (damping constant 0.14). Its ratio of successive amplitudes (2 to 1) is about 4 times that of natural rubber and 100 times that of steel. The log decrement is 0.69. Fabreeka's® high damping is attributed to its large energy loss per cycle (Hysteresis) 25 to 45%.

Hardness and Stability

The Shore A Durometer hardness of Fabreeka® is 90 ± 5. This combined with a limited compressibility affords a greater degree of stability than is found in other types of vibration isolators.

Electrical Insulation

Fabreeka® has a dielectrical strength of 12,500 volts (210 volts/mil) and a resistivity of 8.5 x 109 ohm-cm. (Insulating material classification requires resistivity of 100,000 ohm-cm.) Dielelectric Constant is 9.34 with a Power Factor of 0.201 and a Loss Index of 1.881. All the above values are for Fabreeka® at standard room conditions of 73ºF (23ºC) and 50% relative humidity.

Service Life

The unusual strength of Fabreeka® and its ability to withstand conditions of service commonly encountered with both indoor and outdoor applications insures long life and constant efficient performance.

Fabrication

Fabreeka® is furnished in the form of pads, washers, bushings, and specially fabricated and molded shapes in accordance with customers specifications and drawings. Special units with steel or plastic bonded to Fabreeka® are also available.

Fabreeka® Material Tolerances:

Resistance To Water, Oil And Heat

Fabreeka® is impervious to most oils and resistant to the effects of steam, water, mildew and brine. Continuous temperature exposure limits for long life are 200°F (95°C) maximum and -65°F (-55°C) minimum.

Sizes

Other thicknesses are available by simply combining and bonding the above standard ones. Thicknesses shown are nominal. Please contact Fabreeka® Engineering for actual thickness and tolerance values.

Some typical Fabreeka® pad applications include:

• Bridges
• Buildings
• Cranes
• Fans/Blowers
• Forging Hammers
• Foundry
• Heavy Industrial Machinery
• Marine
• Military
• Mining
• Pipelines
• Presses
• Printing Presses
• Pulp & Paper Equipment
• Railroad and Transit
• Scales
• Smoke Stack Dampers / Exhaust
• Steel Industry

Please contact Fabreeka® to request a brochure.
Please visit our application section to learn more about Fabreeka's® diverse applications.