Thermo-Wrap Inspectable™

Thermo-Wrap Inspectable, NRI’s custom-engineered repair system utilizing a fiberglass, composite-reinforced-coating, now features a thicker, non-crimped, glass fiber architecture and nano-tube-enriched-resin that combine to yield higher-strength characteristics, resulting in fewer layers per application.

Thermo-Wrap is used to repair corroded or damaged piping with harsh chemical services and elevated temperatures.

Using common radiographic inspection methods, owners and operators have the ability to monitor the integrity of an “in-service” Thermo-Wrap Inspectable repair through the course of its intended design life.


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Typical Applications

  • Flare lines, blow down lines, steam piping, chemical processing lines
  • Girth welds, elbows, tee
  • High temperature environments


  • Inspectable via radiography
  • High temperature rating with an ambient-cured epoxy
  • Non-shielding
  • Patented polymer inspection capability
  • Design conforms to ASME PCC-2, ASME B31, ISO TS24817, DOT, API, and CSA Z662 standards for nonmetallic reinforcing solutions


  • Sold based on square foot of coverage required


  • As determined by NRI engineering calculations

Mixing and Mixing Ratio

  • Power mix Part A, then combine with Part B and power mix. Do not mix partial kits. Resin to hardener 5:1 by volume.

Pot Life

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


  • Application temperature shall be a minimum of 50˚F (10˚C) and maximum of 280˚F (138˚C)
  • Relative humidity must be 85% or below
  • Pipe surface must be 5˚F (15˚C) above dew point

Related Products

The following products are system components of the Thermo-Wrap system:

  • Filler: Thermo-Fill™HT
  • Primer / Saturant: Thermo-Poxy™ Inspectable
  • UV Protection, if necessary: Syntho-Coat™ or Syntho-Glass®UV
  • Compression Film


The Thermo-Wrap composite repair system was designed to conform to, and is recognized by 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 (25-76 microns) minimum. NRI’s composite repair systems are bond-critical and require a strong adhesive bond between the clean pipe and the composite system for maximum effectiveness.


Installation of the Thermo-Wrap Inspectable composite repair system shall be performed by NRI qualified applicators only. Surface preparation, mixing of epoxy, material saturation, and installation of the system shall be in accordance with NRI’s product specific installation guides, latest revision. Quality control inspection during and after installation of the 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

  • Epoxy: 12 months
  • Fabric: 12 months

Storage Conditions

  • Epoxy: store in original, unopened containers, indoors at a max temp of 95°F (35°C).
  • Fabric: store at temperatures below 100˚F (38˚C) away from moisture or any contaminants, in original packaging


Thermo-Wrap Inspectable is supplied in kits which contain:

  • Thermo-Wrap dry fiber ranging in widths from 3” (8cm) to 12” (30cm)
  • Thermo-Poxy ranging from pint to gallons for the following coverages: 20ft2 (1.8m2 ), 40ft2 (3.7m2 ), 80ft2 (7.4m2 ), 160ft2 (14.8m2 )
  • Typically ships in 17” x 15” x 14” boxes (43cm x 38cm x 36cm)