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SilFlex® Type DSF

This ducting features a double-ply silicone coated fiberglass fabric with the helical wire reinforcement encased between two plies of fabric. Its liner allows for improved air flow and less air friction loss. The Silflex® DSF ducting product offers a higher pressure rating than the Silflex® SSF.

Technical Overview

Random Lengths (Plain Ends)
  • ± .03″ (1/32″)
Inside Diameter
O.A.L. (Overall Length)
  • ± 1/4″ per foot
Cut to Length – Cuffed (Soft End Item)
Inside Diameter
  • ± .03″ (1/32″)
O.A.L. (Overall Length)
  • Under 18” = ± 1/8″
  • 18″ and longer = ± 1/8″ per foot of length
Soft Ends (Cuffs)
  • ± 1/4″
  • – 1/8″


Thermoid Industrial Ducting – Brochure

Coatings & Finishes

The coatings offered by Thermoid can reduce the loss of air and gases through the duct wall, increase abrasion and chemical resistance, reduce ducting flexibility, as well as the inside diameter of the duct, and increase the weight and wall thickness of the duct.
Available Coatings
  • Neoprene (CR) (Black) – Neoprene is the most commonly used industrial duct coating. It resists ozone, sunlight oxidation, heat and flame. Neoprene performs well in contact with oils, water and some chemicals. It has good tensile strength and resilience.
Maximum Recommended Coatings
  • Neoprene – 4 Coats (For coating, specify duct type and number of dip coats).
The following end finishes are integrally manufactured into the ducting.
Soft End
  • That portion of the duct where the wire reinforcement is omitted, having the same number of plies as duct body, plus one additional ply of fabric over soft area. This type of end provides a smooth clamping area.
Reduced End (Special)
  • The hose end has an ID that is smaller than the duct body. A rubber insert usually forms this end.
Plain End
  • Hose with a plain end is simply cut at a given point, the end being the same as the duct body. The wire at the cut end is crimped back to prevent snagging. All standard items are furnished with plain ends.
Belled End (Special)
  • A belled end has a soft end with an ID larger than the duct body.