• Wide temperature range (-60º to 260ºC)
  • Very low smoke emission
  • Good chemical resistance
  • Excellent resistance to weathering
  • Waterproof and airtight
  • Unaffected by mildew

THERMAFAB™ is a specially developed fiberglass fabric, coated on both sides with silicone rubber. It incorporates a very broad temperature range with outstanding resistance to weathering, aging, the effects of sunlight, and a wide variety of chemicals.

THERMAFAB™ does not support combustion and produces very little smoke on exposure to flame and extreme heat. It is supplied in 30m (100 ft) coils of fabric joined on both sides to galvanized steel, or as a fabric only for special applications.


While it may be used almost anywhere a flexible duct connector is needed, THERMAFAB™ is particularly suited to those applications exposed to higher temperatures, or where the risk of fire is concerned. THERMAFAB’s extremely low smoke emission alleviates the possibility of noxious fumes from the connector being added to the duct air stream in the event of a fire.


Base Fabric: Woven Fiberglass
Coating: Silicone rubber
Mass (Weight): 576 g/m² (17 oz/yd²)
Thickness: 0.50mm (.019″)

Tensile Strength: 890x665N (200×150 lbs)
CAN 2-4.2-Method 9.2

Tear Strength: 220×180 N (50×40 lbs)
CAN 2-4.2-Method 12.1

Burst Strength: 1100 kPa approx. (160 psi)
CAN 2-4.2-Method 11.1

Temperature Range: -54° to 260°C (-75° to 500°F)

Fire Resistance: Flameproof. Will not support combustion. Surpasses Standards for Safety as per “Flame Tests of Flame Resistant Fabrics”, NFPA 701. Meets requirements for Duct Connectors as per National Fire Protection Association, Standards 90A and 90B.

Approvals: UL classified, File No. R4462. Approved for use by California State Fire Marshal, City of Los Angeles, City of Denver.

Chemical Resistance of Duro Dyne Coated Fabrics sheet (PDF)

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