
Overview
Materials & Construction

All Durcor pipe is manufactured with glass fibers and a premium grade vinyl ester resin in an automated manufacturing process developed by PureFlex for composite pressure piping. Interior heavy wall virgin PTFE pipe liner provides maximum chemical resistance.
Fittings
All fittings are manufactured in hardened, dedicated tooling and are consistently produced using the similar glass / resin ratios and systems as the pipe.
Joining Systems
All molded flanges, fixed and rotating, are positively located over pipe ends and attached with PureFlex adhesive for maximum integrity.
Applications
- Acids
- Chlor-Alkali
- Mining
- Solvents
- Pharmaceutical
- Caustic
- Bleaches
Pipe Construction
- Minimum of (3) resin-rich surface veils of a minimum 20 mils to form the inner surface of the Durcor pipe.
- Dense bundles of glass rovings are applied in both the axial and radial directions to provide the mechanical properties of Durcor pipe.
- A protective heavy layer of chopped strand mat is applied over the glass rovings.
- Two final layers of resin-rich surfacing veil for UV protection.
- Fittings shall be molded in dedicated resin transfer tooling.
Applicable Documents
ASTM F1545 “Plastic-Lined Ferrous Metal Pipe, Fittings, and Flanges”
ASTM D4894 “Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials”
ASTM D4895 “Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion”
ASTM D1599 “Resistance To Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and Fittings”
This Standard defines the procedure to determine burst pressures of pipe, tubing, and fittings. The resultant burst pressure then provides an ultimate hoop stress value based on product dimensions. Durcor pipe and fittings have been tested for short term burst pressure and the ultimate hoop stress determined. Recommended working pressures for Durcor piping are one-fourth of the ultimate stress values obtained.
ASTM D5685 “Fiberglass (Glass-Fiber-Reinforced Thermosetting-Resin) Pressure Pipe Fittings”
ASTM D4024 “Machine Made “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Flanges”
Drop Impact Testing
Following the test procedures of the falling weight impact testing per ASTM D2444 “Determination of the Impact Resistance of Thermoplastic Pipe and Fittings by Means of a Tup (Falling Weight)”, results showed that Durcor pipe can withstand a room temperature drop impact energy of up to 72 ft-lb without failure. Additionally, the impact resistance increased with decreasing temperatures when Durcor pipe was saturated to (-40°F); the drop impact resistance improved to over 80 ft-lb.
Average Typical Properties | ||||
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Beam bending design stress is 1/8 of ultimate to allow for combined stress (bending and pressure) | ||||
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 | 4.5 × 10-6 in/in/°F | 10 × 10-6 in/in/°F |
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Specific Gravity | 1.92 (housing) and 2.15 (PTFE) | 1.80 | ||
Heat Deflection Temperature | 266 °F | |||
Hazen-Williams Flow Coefficient | 155 | 150 | ||
Thermal Conductivity | 0.22 BTU-in/hr-ft2_oF |
PTFE Physical Properties | |||
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Property | ASTM Method | Unit | Value |
Tensile Strength | D638 | PSI | 3,000 |
Ultimate Elongation | D638 | % | 250 |
Flexural Modulus | D790 | psi | 70,000 |
Hardness | D2240 | Shore D | 55 |
Thermal Conductivity | E1530 | BTU-in/hr-ft2_oF | 0.14 |
Dielectric Strength | D149 | V/mil | 600 |
Water Absorption | D570 | % | <0.01 |
Static Coefficient of Friction | 0.05 | ||
Specific Gravity | 2.14 – 2.19 |