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A pictures of three CLD-tiles from Vibratec used for damping noise in stiff structures

Constrained Layer Damping Tiles

Constrained-layer damping (CLD) tiles are used to increase damping in stiff structures. A “sandwich” is formed by laminating a damping layer in between two structural constraining base layers. When the system flexes during vibration, shear strains develop in the damping layer and energy is lost through shear deformation of the material. Varying layer thickness ratios permits optimizing system loss factors for various temperatures without changing the material’s composition.

Product Characteristics

Constrained Layer Damping Tiles consist of a constraining sheet and a viscoelastic polymer that consists of a high performance acrylic system. The polymer is primarily characterized by its joining strength, load-dissipating properties as well as temperature and weather resistance, and has a high loss factor in a wide temperature range, depending on the viscoelastic core type.

Due to the products unique composition, the double adhesive acrylic viscoelastic polymer combines very high adhesion levels with the ability to absorb and dissipate vibrational energy.

The products viscoelastic core can compensate for thermal elongation of bonded parts.

CLD tile performs well on materials that are difficult to join, such as powder coatings or plastic materials. Even in connection with combinations of such materials, this product provides advanced security due to its innovative design.

Vibratec CLD-tile VT-WL44
Temperatur range: Good for lower temperatures

Vibratec CLD-tile VT-WL55
Temperatur range: Good for higher temperatures

Vibratec CLD-tile VT-WL44-55 Hybrid
Temperatur range: Wide range of both temperatur and frequency

A realistic insertion loss are expected to be lower due to different in-situ conditions. Expect 6-10 dB for most applications.

Product Applications

  • Reduction of structure borne noise radiation from steel bridges
  • Reduction of structure borne noise radiation in marine & offshore applications
  • Reduction of structure borne noise radiation in industrial applications, gensets, generators, wind turbine towers etc.
  • Reduction of structure borne noise radiation in steel balcony applications

Video illustrating the noise reduction from installation of CLD-tiles at SSAB’s factory in Oxelösund in Sweden

Technical Specifications

cld-tiles-technical-specifications.xlsx

Insertion Loss

CLD-Tile Max. Theoretical Insertion Loss llp, dB
Measured on test specimens in a lab
Comments
+20 °C +5 °C -10°C
VT-WL44 11 14 14 Good for lower temperatures
VT-WL55 14 13 11 Good for higher temperatures
VT-WL-Hybrid 13 14 13 Wide range of temperature and frequency
Note:
The realistic insertion loss is expected to be lower due to different in-situ conditions.
Expect 6-10 dB for most applications

Characteristics

Characteristic VT-WL44 VT-WL55 VT-WL44-55-Hybrid
Core material Viscoelastic Acrylic Polymer Viscoelastic Acrylic Polymer 2 Viscoelastic Acrylic Polymers
Adhesive Acrylic Acrylic Acrylic
Color Grey / White Transparent Transparent / Grey / White
Thickness of
acrylic polymer
app. 1 mm app. 1 mm app. 1 mm
Adhesive strength
on steel (After 72 h)
36 N/cm 24 N/cm 24 N/cm
Release liner Yes Yes Yes
Multiple layers Yes (special option for increase
damping further, and widen
the temperature range)
Yes (special option for increase
damping further, and widen
the temperature range)
Yes (special option for increase
damping further, and widen
the temperature range)
Constraining sheets
available in
• Galvanized steel,
AISI 304 or AISI 316
• Aluminum & seawater
resistant aluminum
• Carbon fiber & FRP panels
• Galvanized steel,
AISI 304 or AISI 316
• Aluminum & seawater
resistant aluminum
• Carbon fiber & FRP panels
• Galvanized steel,
AISI 304 or AISI 316
• Aluminum & seawater
resistant aluminum
• Carbon fiber & FRP panels
Size & shape Customized/ Project specific Customized/ Project specific Customized/ Project specific
Thickness 2-20 mm, customized 2-20 mm, customized 2-20 mm, customized