Duro-Bond ETFE is a laminated sheet lining consisting of a layer of Ethylenetetrafluoroethylene (ETFE) resin laminated to a fabric backing that is readily bonded to steel, concrete, or FRP substrates.

Polymer Name: Ethylene Tetrafluoroethylene Copolymer (ETFE)

Physical Form: Sheets

Features: Chemical Resistant, Corrosion Resistant, Good Abrasion Resistance, Good Bonding Strength, Good Smoothness, High Purity, Low Permeability, Service Life Extension

End Uses: Chemical Process, Tanks, Valves

Tensile Strength: 44.0 - 44.0 MPa

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    Identification & Functionality

    Technologies

    Features & Benefits

    Product Characteristics

    ETFE is a partially fluorinated thermoplastic resin that is melt flow processible. Duro-Bond ETFE sheet lining is available in thicknesses of 60 mils (1.5 mm) and 90 mils (2.3 mm).

    Advantages
    • Duro-Bond ETFE fluoropolymer sheet lining exhibits outstanding chemical resistance, being virtually unaffected by many of the corrosive chemicals commonly encountered in the chemical process industry.
    • Duro-Bond ETFE is resistant to strong mineral and oxidizing acids, alkalis, metal etchants, liquid oxygen and essentially all organic solvents. Typical of the fluoropolymers, ETFE is attacked by metallic sodium and potassium. Rate of attack is a function of exposure time and temperature.
    • Duro-Bond ETFE sheet lining provides substrate protection by virtue of its excellent permeation resistance. The ETFE fluoropolymer has low permeability to water vapor and various other gasses. The ETFE fluoropolymer also exhibits low permeability to liquid chemicals.
    • Duro-Bond ETFE does not contain any fillers or plastizers to leach out and contaminate the service thereby making it an excellent choice for handling high purity chemicals.

    Applications & Uses

    Plastics & Elastomers End Uses
    Uses
    • Duro-Bond ETFE is used as a vessel lining material to provide chemical resistance to acids, bases, oxidizing agents, organic solvents and other corrosive media. Duro-Bond ETFE can be applied to tanks, scrubbing towers, reactors, valves, columns, agitators and other process equipment for handling corrosive materials.
    • When a combination of chemical, temperature, abrasion and permeation resistance is required Duro-Bond ETFE may be the optimum solution to the corrosion problem.
    Application

    The method of application is as follows:

    1. The surface to be lined is properly cleaned and grit blasted to a white metal finish to provide a suitable surface for bonding. (See Electro Chemical Technical Bulletin #1, “Specification for Welded Steel Tanks, Stacks, Ducts or Other Fabricated Equipment for Protective Linings and/or Coatings”.)

    2. The Duro-Bond ETFE laminate is cut into panels to cover the entire area to be lined with a minimum amount of joints to be welded.

    3. The panels are then cemented into position and the seams welded with Duro-Bond ETFE rod and ETFE cap strip using a thermoplastic welding gun with nitrogen gas as the inert atmosphere.

    4. Suitable ventilation and respiration equipment must be used while working with this material.

    Method of Testing
    • All lined surfaces are visually inspected for surface defects. Any special dimensional tolerances required after lining are also checked.
    • All lined areas are then spark tested for pinhole leaks using a dielectric spark tester adjusted to 10,000 volts. The tester is moved constantly and quickly over the lining surface to prevent a burn through.
    Repair Procedure

    Duro-Bond ETFE sheet lining can be shop or field repaired. The repairs to defective or damaged areas in the sheet lining are accomplished by cutting out the faulty area, grinding or grit blasting the substrate surface, preparing a piece of sheet of the same dimension, cementing it into position and subsequently welding the joints as described under Application. The repaired area is then inspected and spark tested to insure lining integrity.

    Properties

    Physical Form
    Physical Properties
    ValueUnitsTest Method / Conditions
    Chemical CharacterizationThermoplastic fluoroCarbon polymer
    Melting point270.0°C
    Upper Service Temperature155.0°C
    Density (23°C) 1.7g/cm3
    Tensile Strength44.0N/mm2
    Elongation at Break200.0%
    Solubility in waterInsoluble
    Hardness DurometerD 75
    Water Absorptionmax. 0.03
    Oxygen Indexmin. 30%
    FlammabilityV-0
    Thermal Expansion Coefficient 23 -150°C8-12 x 10-5mm/mm/°C

    Technical Details & Test Data

    Service Temperature

    ETFE fluorocarbon resins withstand continuous service temperatures as high as 150°C(300°F). When adhesively bonded to a substrate, the maximum recommended service temperature for Duro-Bond FEP sheet lining is 110°C (230°F) on a continuous basis, 120°C (250°F) on an intermittent basis.

    Safety & Health

    Safety Issues

    ETFE resins are nonvolatile and safe at normal room temperatures. Good safety practice requires the use of adequate ventilation and respirators when processing ETFE. Heating ETFE may produce fumes and gasses that are irritating or toxic. Care must be taken to avoid contamination of smoking tobacco or cigarettes.

    Refer to the ETFE Material Safety Data Sheet for detailed recommended procedures for the safe handling and use of ETFE.