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Intumescent Fire Stop Manufacturing. Selling Internationally.

FB-525 Fire Stop Product

ALVA-TECH Fire Barrier material is an intumescent elastomer formulated to protect surfaces and openings in three ways:

  1. On exposure to flame and heat, the material absorbs heat and begins to expand. At a relatively low temperature, 250ºF (121ºC), expansion and the resultant flexible foam starts sealing any existing openings as the temperature rises.
  2. The material forms an insulating barrier to retard the spreading of flames and control temperature increase.
  3. The material forms a refractory char as the temperature continues to rise, providing additional protection.

Typical Intumescent Properties

A 0.25″ x 1.5″ x 1.5″ Specimen heated for thirty (30) minutes:

TemperatureExpanded Volume
250ºF (121ºC)1.5 Times
350ºF (177ºC)2.8 Times
500ºF (260ºC)4.0 Times


  • Poke-through Fittings
  • Fire Door Seals
  • Joints
  • Boxes & Enclosures
  • Cable Wrap
  • Coverings

ALVA-TECH Fire Barrier material is a coated elastomer and can be supplied in a wide variety of customized shapes and forms. Standard polyethylene coated sheets are 0.25″ x 24″ x 33″ and weigh approximately 10 pounds per sheet. Tapes in varying thickness’ and widths can be made available in addition to custom molded designs.

Alva-Tech Fire Barrier Properties

  1. Intumescence is activated at a low temperatures.
  2. Quick and complete sealing of opening by expansion with heat (intumescence) in all directions.
  3. Protection provided by formation of expanded char.
  4. Outstanding flexibility for easy handling and application.
  5. Easily cut to size and shape.
  6. Can be custom molded to many shapes and thickness’ to minimize waste and allow freedom in product design.

ALVA-TECH Fire Barrier Sheet FB 525 (vinyl or polyethylene coated) U.L. Recognized Component, Guide OEXX2, File No. R10488. See Underwriters Laboratories Inc. Recognized Component Directory.

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