Seamless PVC/FRP - RPS Composites

Seamless PVC/FRP Dual Laminate

Dual Laminate pipe systems incorporate a thermoplastic liner in an FRP structure combining the enhanced corrosion resistance of thermoplastics with the higher strength and load carrying capabilities of FRP.

Our PVC/FRP seamless dual laminate uses only virgin Polyvinyl Chloride (PVC) and meets the requirements of ASTM D-1784. It may include less than 1% inorganic pigment for identification.

Polyvinyl Chloride is chemically inert to a broad range of commercial chemicals including the following:

Mineral acids


Salt solutions


Bonding of the PVC liner to the FRP structure results in a chemical linking of the structure to the liner. The shear strength of the bond as measured per BS 4994 B-10 is 1015 PSI minimum.

This bonding technology eliminates air gaps between the PVC liner and the vinyl ester structure, thereby preventing condensation between the liner and structure, a common problem in lined steel pipe. Since these gases/ liquids are not trapped between our PVC liner and vinyl ester structure, no weep holes are required and internal corrosion of the structure is eliminated.

  • Resin: INEOS DERAKANE 411™ Bisphenol A Epoxy Vinylester (™ Trademark, INEOS Composites or its subsidiaries, registered in various countries.)
  • Glass: ‘ECR’ Glass
  • Pressure Ranges: suitable for continuous operation from full vacuum to 150 PSI for 1” dia. through 12” dia. and full vacuum to 100 PSI for 14” dia. through 24” dia..
  • Maximum Test Pressure: 225 psi (15 BAR)
  • Temperature Range: 0°F (-18°C) to 170°F (77°C).
  • Manufactured via combination of contact molding and filament winding. Available in sizes 1½” – 24” diameter. Refer to the specifications bulletin below for dimensions.
  • Minimum Barcol hardness of 90% of resin manufacturer’s specified value
  • External resin coating containing paraffin, pigment, and ultraviolet absorbers to assure proper surface cure and inhibit ultraviolet light degradation.
  • Pipe and fittings are shop and field assembled using butt joints, accomplished by welding the liner sections and then laminating the components together as per ASTM D6041. The liner weld is accomplished by solvent, hot plate, or hot gas welding. Welds are spark tested to detect pinholes prior to laminating.
  • Flanges available in either full face or lap joint style. Drilling in accordance with ASME B16.5 Class 150.
  • The type of pipe support to use for a specific application will depend upon a number of factors, the most important of which are the intended function of the support and the configuration of the available structural steel.

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