Sandwich foil SFRT
Areas of application

Workshop machines, fans, mills, printers, material handling machines, particle separators, power equipment, generators, compressors, food processing machines, hoods.

Transportation and vehicles
Bus floors, off road vehicles, forest machines, ships and railway wagons.

Elevators, steps, engine rooms, ventilation installations, doors, floors, transportation shoots, fans.

Printers, sorting- and enveloping machines, loud speakers.

Method of use
The parts are cut or stamped to the required shape and carefully pressed on to a surface that must be free from oil, dirt, and dust.

  Product characteristics

Sandwich foil SFRT is a viscoelastic foil of fibre- enforced bitumen.

The Foil has self-adhesive glue at both sides for the application in between two constraining layers of constructional material.


* Very good structure damping also   for thick constructions of wood and   metal
* Good damping for a wide frequency   range
* Increase the transmission loss,   especially for wood constructions
* Water-repellent
* Long service life

PDF-format for printing

Combined Loss factor, η.

Temperatur, ºC

Transmission Loss, DTL

Frekvens, Hz, Third Octave Bands

Technical data
Loss factor: See diagram.

-30°C to +100°C

Fire class: FMVSS 302

Coefficient of
thermal conductivity:

Colour: Black

Adhesive’s tear
strength :
Approx. 15 N/cm test width

Surface film thickness:

Freon and PVC free

1,6 mm

Weight: 1,3 kg/m

Delivery format: 1000x1000 mm
                          (other sizes and shapes                           can be supplied on request)

  The shaping and positioning of the material is of major importance to achieve an optimal sound-dampening effect.
 SONTECH has long experience of practical noise control projects in a wide range of industrial fields. These experiences can be a valuable addition to the laboratory data given in the datasheet.
  SONTECH can also assist with advice and sound measurements for noise control and in the manufacture of customised material sets .

Designation system

Sandwich foil :

Optimised for room temperature: RT

Exampel of
ordering code:

Sontech NoiseControl™ - Sontech AB · Energivägen 6
SE 196 37 Kungsängen · Tel +46 8 445 50 60 · Fax +46 8 38 47 99