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Endurance™ Composites Fiberglass Pipe and Fittings

The manufacturing of Endurance™ Composites fiberglass (FRP/GRP) pipe and fittings require extensive experience and knowledge to effectively work with resin complexities. The Endurance™ Composites brand has produced fiberglass pipe for world class companies for over 60 years. With our ability to manufacture, fabricate, and install FRP pipe and fittings, we ensure even the most complex projects will be successful.

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Product Features & Benefits

  • EXCEEDS INDUSTRY STANDARDS: Endurance™ Composites brand of fiberglass reinforced pipes is designed to meet or exceed a multitude of plant specifications and various pressure ratings as well as industry accepted standards.
  • OFFERS EXTENSIVE DIAMETER SIZE OPTIONS: Endurance™ Composites produces fiberglass pipe from 1" to 72" in diameter, and we source virtually any resin required for your application.
  • INCORPORATES HAND LAY-UP TECHNIQUES AND FILAMENT WINDING: We utilize hand lay-up techniques and filament winding in our manufacturing process. The difference in these techniques is the orientation and layering of the glass fibers. The below diagrams show hand lay-up utilizes woven glass rovings as opposed to continuous glass rovings.
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Complete Line of Fittings:

Endurance™ Composites fittings are typically in stock for immediate shipping. Endurance hand lay-up fittings ensure consistent quality, mechanical strength, and the same corrosion resistance liner thickness as our pipe. We do not use or manufacture molded fittings like other piping companies, and this is to ensure the maximum amount of corrosive resistance for your need. 

We can custom design and build complicated pipe spools in our facility under factory-controlled conditions. Our fabrication guarantees a successful, quick installation when downtime at the plant needs to be kept to a minimum. 

Our fittings are manufactured in a unique 3-stage process: 

  • Internal Corrosion Barrier: Minimum double synthetic veil reinforced resin rich internal corrosion barrier (inner liner), 60 mils minimum (Schedule 50=100 mils), per the recommendations of the resin manufacturers to improve chemical, impact, and abrasion resistance.
  • Filament Wound Cage: Filament Wound Fittings are reinforced with alternating layers of glass cloth for axial strength, and continuous E-Glass strand for hoop strength. The structural cage of our fittings is saturated with aromatic amine cured Epoxy resin, selected by Andronaco engineers for the high heat deflection temperature (HDT) performance (over 300°F).
  • External Corrosion Barrier: Fittings are encapsulated with a Nexus reinforced external corrosion barrier to insure chemical resistance against spillage, impact resistance, and to provide a UV barrier that allows Endurance to extend a 25-year guarantee against UV light degradation, or "fiber-blooming".

Contact Customer Service for additional information. 

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Technical Details

  • NBS PS 15.69 (hand lay-up)
  • ASME RTP-1 (hand lay-up)
  • ASTM 2996 (filament wound fabrication)

Size Range

  • 1" to 72" with a complete line of fittings.


  • Water & Wastewater
  • Chemical
  • Oil & Gas
  • Pulp & Paper
  • Mining
  • Metal Processing
  • Food Processing
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View Our Chemical Resistance Guide

This resource is intended as a guideline to be used with all available information to determine suitability of material selection. We suggest thorough research which should include known applications when determining material. The information contained herein is provided only as a guide for the use of ANDRONACO INDUSTRIES products.

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Give us a call at 616-554-4600 or fill out this form and one of our experts will be in touch as soon as possible.

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