Durcor® Advanced Composite
PTFE Lined Piping System


Pipe Components

PTFE Maximum Chemical Resistance

PTFE LiningWithout question, PTFE (polytetrafluoroethylene) offers the broadest capabilities of any commercially available material. In Durcor® pipe, it will handle temperatures up to 300ºF and resist:

  • all acids, all solvents
  • all organic and inorganic chlorides & sulfates
  • all bleach solutions
  • all phenols, all caustics
  • all peroxides
  • as well as any combination of the above.

PTFE also has incredible non-stick properties which eliminate and/or minimize deposits on pipe wall.

Durcor®’s seamless PTFE liners exceed the requirements of ASTM F1545 where applicable. Liner thickness ranges from .130” for 1” pipe to .310” for 8” diameter piping. Durcor®’s thick and strong liners aid in permeation resistance and are able to withstand full vacuum conditions throughout its full temperature range.

Thermosized™ PTFE Liners

LiningDurcor®’s thick, free standing PTFE liners undergo a battery of tests designed to ensure liner integrity prior to being positioned into its structural composite housing. Durcor®’s unique Thermosizing process combines the PTFE liner into the composite pipe. An additional heating cycle then relaxes the liner for a snug, interference fit within the composite housing. The Thermosize technique provides PTFE dimensional stability under pressure, vacuum and temperature cycling conditions.

  • Resin-rich outer layer provides corrosion and abrasion barrier. The barrier surface provides excellent chemical resistance from hostile environments and corrosive soils that can attack carbon steel. The additional layers add protection against glass blooming caused by ultraviolet radiation from sunlight.
  • Glass matrix mass fully saturated with vinyl ester resin provides excellent impact resistance.
  • Axial glass roving filament bundles in linear direction provide exceptional stiffness and better span capabilities with near-zero thermal expansion.
  • Continuous bundles of reinforcing glass roving is wrapped radially over inner veil to provide outstanding hoop strength for 4:1 pressure safety factor.
  • Multiple inner layers of resin-rich veil provide superb corrosion barrier to reinforcing roving bundles.
  • PTFE liner thickness exceeds the requirements of ASTM F1545 and is full vacuum rated in all sizes to +300°F.
Watch Durcor Fabrication Video
Typical Properties of Durcor® PTFE Liner
Property Test Method Unit Value
Tensile Strength ASTM D638 PSI 3,500
Ultimate Elongation ASTM D638 % 250
Izod Impact Strength @ (-)40ºF ASTM D256 ft-lb/in 1.5
Izod Impact Strength @ (+)75ºF ASTM D256 ft-lb/in 3
Hardness, Durometer ASTM D2240 Shore D 55
Thermal Conductivity ASTM E1530 BTU-in/hr-ft2_oF 1.7
Dielectric Strength ASTM D149 V/mil 600
Surface Resistivity ASTM D257 ohm-sq. >1018
Water Absorption ASTM D570 % <0.01
UL 94 Flame Rating     94 V-0
Static Coefficient of Friction     0.05
Specific Gravity     2.14 – 2.19
Typical Properties
Typical Physical Properties 75°F 250°F Typical FRP @ 75°F Method
Axial Tensile Strength 48,000 psi 31,200 psi 11,600 psi ASTM D2105
Axial Tensile Design Strength 12,000 psi 7,800 psi 3,870 psi ASTM D2105
Axial Modulus of Elasticity 2.76 × 106 psi 1.70 × 106 psi 1.60 × 106 psi ASTM D2105
Axial Compression Strength 50,750 psi 34,075 psi 14,500 psi ASTM D695
Axial Compression Design Strength 12,690 psi 8,520 psi   ASTM D695
Compression Modulus 2.39 × 106 psi 1.47 × 106 psi   ASTM D695
Beam Bending Ultimate Stress 47,100 psi 35,300 psi 12,380 psi ASTM D2925
Beam Bending Design Stress 5,900 psi 4,410 psi 4,410 psi ASTM D2925
Poisson's Ratio 0.32 0.65  
Flexural Modulus of Elasticity 3.26 × 106 psi 1.89 × 106 psi 1.81 × 106 psi ASTM D790
Coefficient of Linear Thermal Expansion 6.7 × 10-6 in/in/°F 10 × 10-6 in/in/°F  
Specific Gravity 1.92 (housing) and 2.15 (PTFE) 1.80  
Heat Deflection Temperature 266 °F    
Hazen-Williams Flow Coefficient 155 150  
Thermal Conductivity 0.7 BTU-in/hr-ft2_oF