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U.S. Bellows U.S. BELLOWS, INC.
FABRIC EXPANSION JOINT CATALOG
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Flexxcel Fluoroplastic Materials

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Fluoroplastics (PTFE) — The chemical resistance of this material is unequaled by other materials.

Chemical resistance, temperature limitations, abrasion resistance, tensile strength and susceptibility to flutter/vibration are major considerations when selecting a fabric material. Please review the following section for details regarding FLEXXCEL Fluoroplastic products.

Evolution of Flexxcel Fluoroplastic Materials

Fiberglass Coated Cloth
  • Fiberglass substrate is thoroughly coated on both sides with a minimum of 35% to 40% by weight of PTFE resin for mechanical strength.
  • Fluoroplastic coating is 100% pure PTFE material.
  • Fiberglass Coating ProcessFluoroplastic Coating
    Fiberglass + PTFE = Coated Fiberglass


  • Fiberglass reinforcement filaments are E grade or better providing excellent tensile strength.

  • Flexxcel MD4 and HD4
    Extruded, thin single ply film laminated to coated fiberglass.
  • All FLEXXCEL materials have a chemical barrier film to protect the fiberglass substrate and minimize porosity. The chemical barrier component of these materials is in the form of a film that is laminated to the fiberglass cloth.
  • FLEXXCEL MD4 and HD4 = FOR DRY SERVICE


    Flexxcel MD4 and HD4
  • LFP CrossFilm based chemical barriers are laminated to the coated fiberglass. The use of LFP CrossFilm Chemical Barriers Water Icon provides superior protection in corrosive environments.
  • A zero porosity chemical barrier is the most critical component for preventing chemical attack.

    FLEXXCEL MD7, HD7, HD12, and HD20 = FOR WET SERVICE


    Flexxcel MD4 and HD4
  • FLEXXCEL HT series fabric belts rated for temperatures up to 1000°F. Insulation is bonded to FLEXXCEL HD4 material to prevent hot gas from residing between the two components.
  • Extends like of insulation component.Water Icon
  • Prevents insulation from falling into duct.
  • Makes installation of high temperature composite belts easier.
  • A zero porosity chemical barrier is the most critical component for preventing chemical attack.

    FLEXXCEL HT1, HT3, and HT5 = FOR HOT-DRY SERVICE


    Flexxcel Fluoroplastic Belt Materials

    Heat Seal Iron for Fluoroplastic Splice and RepairFluoroplastic materials have been successfully used in challenging expansion joint applications since the early 1980's. The expansion joint fabric is composed of two components— PTFE resins and fiberglass cloth. The fiberglass is used to give the fabric strength. The fiberglass can be of varying weights to give the fabric material the necessary tensile strength. The fiberglass alone is susceptible to degradation from chemicals and liquids. By thoroughly coating all surfaces of the fiberglass filaments, a strong and flexible base material is created. This base material can then be laminated to a PTFE film (Chemical Barrier) of varying thickness to provide a non-porous and chemically inert gas seal. Its virtual inertness to most chemicals make it an excellent choice for applications in wet corrosive environments.

    Fluoroplastics also retain their structural integrity at extremely high or low temperatures, i.e., 600 degrees F to -110 degrees F (uninsulated). Fluoroplastics are capable of withstanding temperatures in excess of 1500 degrees F when properly insulated (composite belt).

    Features of Fluoroplastics

    1. High strength to weight ratio. Easier to handle and install compared to Elastomers.
    2. Simple splice and repair by means of heat seal iron. Material does not age like Elastomers and therefore can be repaired for the life of the material.
    3. Temperature capability up to 600 degrees F without additional insulation.
    4. Materials are easy to drill and punch.

    Flexxcel HD7

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