Capabilities and Variations

Spunstrand® Inc. has been manufacturing filament wound fiberglass reinforced plastic duct and piping for over forty years. Variations in resin, glass, liners, wall thickness, and their applications in corrosive air, HVAC, or fluids, are as diverse as the markets we serve. We have made just about every size and shape imaginable and even provided insulated industrial ductwork. We also have an FDA approved insulated duct for use in food manufacturing plants. The standard guide specification we use is centered around the National Bureau of Standards PS 15-69 and/or the new SMACNA Thermoset FRP Duct construction manual. We also manufacture to various ASTM specifications, ANSI, Military specs and many custom application specifications. We do more custom spec work and spec writing than most FRP manufacturers due to the diversity of product lines, personnel and years of FRP experience.

Capabilities List

  • Custom spec work
  • Special shapes and sizes
  • Polyester, vinylester, epoxy, phenolic duct and piping
  • Custom wall thickness
  • Factory manifolding
  • Round sizes std. from 2″ to 120″
  • All fittings; round and rectangular
  • Carbon Scrubbers
  • Technical drawings
  • Custom liners (glass, synthetic, Teflon)
  • Insulated duct
  • Flanges, blast gates, dampers, (manual or motorized), access doors, etc.
  • Zero Leak Isolation Dampers
  • Complete line of fittings and accessories
  • Color options
  • Consulting (product or field)

Spunstrand® Inc. Fiberglass Reinforced Plastic Duct is custom manufactured for Industrial Corrosion Resistant Fume Exhaust applications. The resin system used is determined by the chemical, pressure and temperature exposures that the duct is subjected to. Typical applications include the following.

  • Industrial FRP Ducting/Corrosive Fume Handling
  • Wastewater Treatment Plants
  • Petrochemical Plants
  • Laboratory Exhaust
  • Glass and Metal Foundries
  • Clean Rooms
  • Plating & Metal Finishing Facilities
  • Micro-Electronic Plants
  • Pulp and Paper Industry
  • Aerospace Industry
  • Automotive Industry
  • Marine Exhaust Systems
  • Food Processing Facilities

Spunstrand® Inc. duct for these applications is manufactured using the filament wound method, where continuous fiberglass strands are impregnated with resin and machine wound onto a mandrel, providing a stronger part than hand lay-up or centrifugally cast laminate. A corrosion barrier is first applied on the mandrel. For the standard 20 mil resin rich surface mat or synthetic veil corrosion barrier, the duct is filament wound prior to the gellation of the liner in order to ensure a complete bond. Liner type and thicknesses are available from 10 to 200 mils depending on specifications and customer requirements.