Fiback® Fiberglass Weld Backing Tape

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Aquasol Fiback® Fiberglass Weld Backing Tape

Fiback Fiberglass Weld Backing Tape is an innovative substitute for traditional back purging methods that provides protection to the backside of the weld environment and ensures a high quality finish. Fiback is flexible, heat resistant, and halogen and fluorocarbon-free, enabling it to be a complete solution for plate, sheet and pipe welding needs.

This welding tape is composed of two adhesive areas around the outside edges with a center fiberglass strip, heat resistant up to 1,022°F (550°C) and withstanding applications up to 600 amps.

Suitable for SMAW (stick), TIG, and MIG Welding processes, Fiback can conform to various shapes making it superior to more rigid solutions that develop stress points between pieces and are prone to cracking and breaking over time.

Fiback reduces set-up, clean up and weld time; eliminates post-weld grinding and back gouging and increases work efficiency while minimizing costs.

Fiback 200 AMP

  • Light duty
  • Sufficient for thinner materials, such as aluminum, carbon steel, chrome steels, cast iron, nickel and cobalt alloys, copper nickel and many more
  • Often used in general fabrication shops and for manufacturing pressure vessels and aircraft components

Fiback 600 AMP

  • Heavy duty
  • Typically used for denser metals, such as stainless steel, duplex stainless steel and other metals depending on thickness
  • Often used for projects in the commercial and military ship manufacturing industry
  • Can be used with automated equipment for more accurate results

How Fiback Works

Types & Sizes:

AFBT-2.5-200 Fiback Weld Backing Tape 200 AMP 2.5″ (64 mm) 1.125″ (28.5 mm) 82′ (25 m)
AFBT-4.0-200 Fiback Weld Backing Tape 200 AMP 4.0″ (102 mm) 1.5″ (38 mm) 82′ (25 m)
AFBT-2.5 Fiback Weld Backing Tape 600 AMP 2.5″ (64 mm) 1.125″ (28.5 mm) 41′ (12.5 m)
AFBT-4.0 Fiback Weld Backing Tape 600 AMP 4.0″ (102 mm) 1.5″ (38 mm) 41′ (12.5 m)


Features and Benefits


  • Suitable for stainless, carbon, duplex and chrome steels as well as other metals
  • Woven fiberglass and malleable aluminum tape easily conform to a number of complex shapes and uneven surfaces
  • A supportive weld pool is created by forming the tape into a convex shape resulting in an oxygen-free weld bead
  • Consistent in thickness, Fiback creates a continuous bead, ideal for lengthy applications

High Quality & Safe Components

  • Halogen and chlorofluorocarbon free, creating a safe work environment
  • Fiberglass formulation is also free of mercury, antimony, fluoride, bromide, phosphorous, sulfur, and lead
  • Virgin aluminum foil coated with free acrylic base adhesive
  • Tightly and finely woven, unadulterated fiberglass

Compatibility & Process Applications

  • Suitable for SMAW (stick), TIG and MIG welding processes
  • Ideal for welding sheet-to-sheet, plate-to-plate, pressure vessels, large diameter pipes and tanks, longitudinal and circumferential seams and anywhere that a back purging is not possible or very costly with gas

Increases Efficiency and Savings

  • Eliminates the need for back purging, increasing weld productivity and reducing labor costs
  • Saves gas as well as down time, allowing the user to bypass filling large structures; such as pressure vessels and bore pipes; with argon
  • Significantly reduces post-weld clean up time by eliminating gouging & grinding
  • Perfectly compatible with orbital welding machines


Non Stock Item - 1 - 2 week lead time is required