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Rockwool Flexible Felt Resin bonded Rockwool blanket supplied in rolls. Available plain or faced with Reinforced kraft aluminium foil, Tissue or Woven glass cloth.

Technical Data

Thermal and acoustic insulation of ducts, vessels, boilers, ovens and in dry wall applications.

  • Mineral wool developed for high temperature applications.
  • Excellent thermal conductivity which reduces heat loss.
  • Shot free.
  • Lightweight products, easy to handle.
  • Soft touch, easy cutting.
  • Outstanding flexibility: can be bent around corners or odd shapes without any edge breaks.
  • Fast and efficient installation.
  • Chemically inert and when applied under controlled conditions will not promote or cause corrosion.
  • Excellent sound absorption properties for noise and control purposes.
  • Meets the European criteria in being non-hazardous to health (EUCEB certificate).

Will provide effective acoustical insulation where there is a need to reduce noise levels or to absorb sound. Actual performance varies with thickness and surface finish.

Can be used at continuous operating temperatures of up to 650°C. Faced felt – limiting temperature of outer facing is 50°C.

  • Width: 1000 mm.
  • Length: 5000 mm.
  • Nominal densities: 60 kg/m³, 80 kg/m³, 100 kg/m³.
  • Thickness: *25 mm, 40 mm, 50 mm (*except in 60 kg/m³).

Non-combustible – tested to SANS 10177-5.

U Thermo Felt typically contains less than 10ppm chloride (SABS Method 1119-1988).

  • Will not sustain vermin.
  • Will not breed or promote fungi, mould or bacteria.
  • Will not settle under vibration.
  • Rot proof.
  • Dimensionally stable, but care must be exercised to limit moisture ingress as this not only compromises the structural integrity but interferes with the thermal resistance properties of the products as well.

ISOVER products are manufactured according to ISO 9001:2008.

ISOVER products are manufactured according to ISO 9001:2008.

All U Thermo Felt products should be stored and handled with care to maintain ex-works quality. The packaging will provide some protection but care should be taken to keep the material dry at all times. Extra protection should always be provided when storing the product outdoors.


As a “One-stop Insulation shop” Insulpro CC can offer insulation solutions across all temperature ranges and applications.


Tel: 011 835 2128 / 29 / 30
Address: 52 5th Street, Booysens Reserve, Johannesburg, 2091


Submission JHB