Syntho-Glass® XT

The Syntho-Glass® XT system is a unique pre-impregnated, bi-directional composite used to repair and reinforce both internal and external corrosion on pipelines or structures.

Our pre-preg system ensures proper fiber-to-resin content ratios which are crucial to reliable performance.


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Typical Applications

  • Pipeline Integrity
  • Transmission and distribution pipelines
  • Oil and gas risers
  • Girth welds on vessels and pipelines
  • Elbows, tees, and flanges
  • Process piping: chemicals, oil, gases, water, and steam
  • Atmospheric corrosion


  • Water-activated polyurethane resin reduces composite preparation time by over 50%
  • Installation in wet, rainy, or submerged environments ensures ease of application in virtually any situation
  • Simplicity and flexibility permit application to irregular shapes and geometries, while eliminating diameter specific inventory
  • Full factory engineering consultation and support, ensuring safe and successful repairs

Theoretical Coverage

As determined by NRI engineering calculations


As determined by NRI engineering calculations

Mixing & Mix Ratio

No mixing required

Pot Life

20 minutes @ 75˚F (24˚C), less at higher temperatures


Application temperature: minimum of 40˚F (4˚C) and maximum of 150˚F (66˚C)
Maximum service temperature: 194˚F (90˚C)

Related Products
The following products are system components of the Syntho-Glass XT system:

  • Filler: Syntho-Poxy™HC, Syntho-Steel
  • Anti-Corrosion Primer: Syntho-Subsea™LV Epoxy
  • UV protection: Syntho-Coat or Syntho-Glass®UV
  • Compression Film


Syntho-Glass XT was designed to conform to ASME PCC-2, ASME B31, ISO TS24817, DOT, API, and CSA Z662 standards for nonmetallic reinforcing solutions. Consult NRI Engineering for specified use.

Surface Preparation

Surface preparation and profiling shall promote continuous intimate contact between the FRP system and pipe by providing a clean, smooth, and circumferential surface. Surface preparation shall be in accordance with SSPC-SP1 “Solvent Cleaning” and SSPC-SP11 “Power Tool Cleaning” with a 1-3 mil surface roughness (25-75 microns) minimum. If existing coating is present, roughen to degloss. NRI’s composite repair systems are bond-critical and require a strong adhesive bond between the clean pipe and the composite system.


Installation of the Syntho-Glass XT System shall be performed by NRI qualified applicators only. Surface preparation, mixing of epoxy, and installation of the system are to be in accordance with NRI’s Syntho-Glass XT Installation Guide, latest revision. Quality control inspection during and after installation of the Syntho-Glass XT system shall be performed per NRI’s Installation Validation Procedure: Quality Control Records, latest revision.

Cleanup and Safety

For proper information regarding the safe handling, storage, and disposal of chemical products, users shall refer to the most recent SDS, latest revision, containing physical, ecological, toxicological, and other safety-related data.

Shelf Life

12 months

Storage Conditions

Store in original, unopened packaging, indoors at a max temp of 95°F (35°C).


Syntho-Glass XT is available in sizes ranging from 2” (5cm) to 12” (30cm) in width and 15’ (4.6m) to 90’ (27.4m) in length. Typically ships in 17” x 15” x 14” boxes (43cm x 38cm x 36cm) Refer to individual data sheets for system components’ product packaging


Syntho-Glass® XT System Components:

Mechanical Properties

Property Circumferential Direction Axial Direction
Tensile Modulus 3.56 Msi (30.5 GPa) 1.96 Msi (15.8 GPa)
Thermal Expansion
5.40ppm/ºF (10.3 ppm/ºC) 29.00ppm/ºF (15.14 ppm/ºC)

Property Typical Test Values
Hardness, Shore D 83
Laminate Thickness0.013
Poisson Ratio0.133
Energy Release Rate 0.525

Cure Schedule

Temperature Working Time Set Time
50°F (10°C) 60 minutes120 minutes
60°F (16°C) 40 minutes 75 minutes
75°F (24°C) 20 minutes 40 minutes
90°F (32°C) 12 minutes 20 minutes
150°F (66°C) 2 minutes10 minutes