Plastic-Lined Steel

Harrington carries a complete line of plastic-lined steel products

Combining the strength of steel with the corrosion resistance of plastics, these plastic-lined steel products provide the best of both worlds.

Lined Steel

Piping Products

DufLine Logo

Harrington is partnered with Duflon, the world’s leading manufacturer of Teflon (PTFE), Polypropylene (PP), and Polyvinylidene Flouride (PVDF) in the fabrication of our finished lined steel product Dufline. We manufacture our lined steel in Houston, Texas, with a second location coming online soon due to our continued growth. All products are made in compliance with ASTM F 1545, the standard specification for Plastic-Lined Ferrous Metal Piping. 

Plastic lined steel fittings
Plastic lined steel fittings
Plastic lined steel fittings

Lined pipes and fittings are used in most Petrochemical, Chemical, Pulp and Paper Industry applications where hazardous acids and solvents are used in processing. Highly acidic and corrosive chemicals have a tendency to corrode and eat away non-lined steel piping. Lined piping systems are also used in the Food and Pharmaceutical Industry where the challenge is to maintain the highest levels of cleanability and durability.

The Harrington Difference
Providing over 60 years of exceptional service

Whether you need stainless steel, ductile iron, or carbon steel, primed or painted, Harrington has every option you may need. For questions regarding our plastic-lined steel piping products, please fill-in the contact form below or call 1-800-213-4528.

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The Strength of Steel
The corrosion resistance of plastics

Combining the strength of steel with the corrosion resistance of plastics, these plastic-lined steel products provide the best of both worlds. Due to the inertness of PTFE to almost all chemicals and solvents, it acts as an effective barrier between the chemical and steel, not only protecting the conveying system but also safeguarding the working environment. Corrosion engineers realize the long-term benefits associated with using high-performance fluoropolymers to prevent corrosion in process piping systems. Lined systems are abrasion and wear-resistant while maintaining non-stick and high purity characteristics.

A wide variety of chemicals can be used through a lined system, making it more versatile and economical for the long term. Due to the absence of corrosion, the life of the pipeline systems increases. PTFE lining safeguards and enhances better working conditions, reduces repair time, and minimizes maintenance costs. Harrington carries a full line of plastic-lined steel products available from 1″ to 12″ with PTFE, PP, PVDF or PFA liners and casing pipe of cast steel, stainless steel, or ductile iron.

Increased Lifespan with Enhanced Rust Protection

Harrington’s standard piping can be made up to 20’ lengths for 1-8” diameter pipe, and 10’ sections for 10-12” diameter pipe. The advantages of lined steel are increased lifespan along with enhanced rust protection, saving time and money from less downtime for maintenance and repairs, and a wide variety of chemicals that can be used through a Teflon lined system making it more flexible and economical. Some common applications are Bio-Pharm, Marine, Chemical Processing, Metal Finishing, Mining, Petrochemical, Pharmaceutical, Power Plants, Refining, Wastewater, and Steel Pickling Plants.

DufLine PTFE-Lined

DufLine® PTFE

DufLine PP-Lined


DufLine PVDF-Lined


DufLine® PTFEPP LinedPVDF Lined
INNER LINERSPolytetrafluoroethylene ASTM D4894, D489Polypropylene Type II Copolymer ASTM D4101Polyvinylidene Fluoride ASTM D3222, D 5575
TEMP RANGEUp to 500°FUp to 225°FUp to 275°F


  • Pipe and Fittings are in full compliance with ASTM F 1545. Standard Specification for Plastic-Lined Ferrous Metal Pipe, Fittings and Flanges
  • Increased piping system lifespan along with enhanced rust prevention
  • Save time and money from less downtime for maintenance and repairs
  • A wide variety of chemicals can be used through a TEFLON® (PTFE) lined system, making it more flexible and economical

Chemical Resistance

  • DufLine® PTFE – Provides superior chemical resistance against many aggressive chemicals and solvents within its continuous operating temperature
  • PP & PVDF – Available depending on chemical service application. Contact Harrington Technical Services for additional chemical resistance data.



  • 45° & 90° Elbows
  • Equal Tees
  • Reducing Tees
  • Short Stack Tees
  • Instrument Tees
  • 45° Equal Lateral Tees
  • Equal Cross
  • Short Stack Cross
  • Concentric Reducer
  • Eccentric Reducer
  • Reducing Flanges
  • Blind Flanges
  • Spectacle Blind
  • Spacers
  • Valves
  • Solid Nozzle Liner
  • Flanged Pipe Spool
  • Instrument Tees
  • Expansion Joints
  • Double Flange Dip Pipe

Outer Casing Materials

  • 304 Stainless Steel
  • 316 Stainless Steel
  • Fabricated Steel 
  • Cast Steel 
  • Ductile Iron

Size Range

  • 1″ – 8″ – Piping Up To 20′ Length
  • 10″ – 12″ – Piping Up To 10′ Length

TÜV NORD Certified

  • ISO 9001:2008
  • ISO 14001:2004
  • BS OHSAS 1800:2007
Teflon, ASTM International
TEFLON® is a registered trademark of Chemours (former DuPont).

Buy your next lined steel product from Harrington and experience the difference.

To help with your plant’s configuration, we offer any accessory you might need.  In addition to our flanged piping, we offer a wide variety of fittings including elbows, equal tees, reducing tees, reducing flanges, blind flanges, spacers, and expansion joints.  We also offer a wide variety of valves, including sampling valves where you can sample your product without shutting down your line.  In addition to the best product on the market, we also offer the best lead times in the industry to go along with the most knowledgeable staff.  If you have a problem, chances are we have a solution.

Can't find what you're looking for?

Call our toll-free number at 1-800-213-4528 and you will be connected to a live person – not a recording. You can also use the contact form above for any questions regarding our frp products.