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Effox-Flextor-Mader (EFM) is the recognized leader in providing non-metallic Expansion Joints to the utility and industrial  markets around the world. With custom engineered  designs for each application, EFM has  provided reliable flexible solutions for service from -40°F  to 2100°F (-40°C to 1149°C). Our EFLEX™ expansion joints  reflect the highest engineering standards and professional  workmanship in the power generation and heavy industrial  market. The EFM team provides customer  service and technical support from project inception to completion.

  • Over 100 years of combined experience  in the Expansion Joint Industry
  • DuPont Certified Supplier of VITON® Fluoroelastomer Expansion Joints
  • Long time contributing member of the FSA (over 25 years)

Quality Standards

  • AISC (American Institute of Steel Construction)
  • AWS (American Welding Society)
  • CWB (Canadian Welding Bureau)
  • ISO 9001:2008
  • CE Compliant


  • Effox-Flextor-Mader is a proud member of ASME (American Society of Mechanical Engineers)



  • All EFM fabrication is performed according to strict Quality Control procedures.
  • EFM offers in-house, non-destructive testing using approved and certified testing methodology. Our in-house quality control staff includes full-time certified welding inspectors (CWI) and NACE certified finishing services.


EFM is the world leader in the design and  supply of non-metallic expansion joints. We offer designs  specifically engineered for every application and have  supplied expansion joints in Boilers, Incinerators, Fans,  Environmental Control Equipment such as SCRs, FGD and Fabric Filters. 


Design Parameters

EFM offers designs specifically engineered for every application and have supplied expansion joints in Boilers, Incinerators, Fans, Environmental Control Equipment such as SCRs, FGD and Fabric Filters. Our expansion joints can be found in Fossil Fired Power Plants, Refineries, Petrochemical Plants, Cement Plants, Steel Mills, Pulp & Paper Plants, and Gas Turbine Applications throughout the world.

The design parameters which influence the performance of any expansion joint and which must be defined for proper design analysis include:

  • Movements
  • Design/Operating Temperature
  • Design/Operating Pressure
  • Flue Gas Composition
  • Adjacent Ductwork Configuration & Metallurgy


Elastomeric expansion joints are used in flue ducts operating at or below 400°F (204°C) and provide vibration and acoustic dampening when connected to large fans.

Material selection is based on maximum duct temperatures and flue gas composition.

  • Ethylene Propylene (EPDM) has very good chemical resistance and is rated for 300°F (149°C)
  • Fluoroelastomers (FKM) such as DuPont’s Viton® were specifically engineered for the low temperature applications at fossil fired power plants and have excellent chemical and abrasion resistance and are rated for 400°F (204°C)
    • Meets FSA-DSJ-401-09 Specification for FKM Compound
    • Belt buildup per FSA-DSJ-402-09 recommendation


Our EFLEX™ Fluoroflex expansion joints can provide a flexible solution for applications operating at or below 600°F (316°C). These materials are designed for wet and/ or corrosive services and provide outstanding resistance to chemicals and heat beyond that of elastomers. Fluoroflex belts are manufactured using a fluoropolymer (PTFE) coated fiberglass cloth with a secondary laminated corrosion barrier of cross-plied PTFE resulting in a superior chemical resistant product with ZERO porosity.

  • Meets FSA-DSJ-403-07 guidelines


Composite expansion joints consist of layers of material bonded and sewn together along the outer edges starting with our Fluoroflex single layer belt as the outside cover and gas seal member. Each layer of a composite is designed to work in unison for the specific service conditions up to 2100° F (1149° C).



Our EFLEXTM Fluoroflex single layer belt beside with the highest temperature capability for a gas seal layer.


Needled fiberglass insulation thermally bonded to the EFLEXTM Fluoroflex substrate to protect from heat degradation. The bonding prevents separation and potential “Hot Spots”.


Additional vapor barrier can be provided for applications which may cycle through dew point.


Vermiculite coated fiberglass fabric acts as an insulator and increases expansion joint strength and durability. Wire mesh layers may also be added for increased
durability and abrasion resistance.


The presence and thickness of this layer is determined by the system temperature to ensure that the heat transfer from the flue gas is reduced to a point less than the maximum temperature of the vapor barrier and cover.


Close weave material binds the belt together, acts as an insulator and adds strength for handling and service. Note: A metal flow liner may be required to protect against abrasion.





Integrally Flanged U-Belt Design

  • Belt is formed at right angles and incorporates flanges into the flexible element
  • Best for single layer belts and services less than 700°F (371°C)
  • Highly effective vibration and acoustical dampening with elastomers adjacent to fans
  • Good design for applications where condensation is an issue as the internal cavity is reduced

Flat Belt Design

  • Mounted parallel to flowstream using metallic frames
  • Multiple design configurations engineered for specific service conditions
  • Best use for higher temperature applications

Expansion Joints Styles

This chart represents only the basic expansion joint designs. Contact EFM for the best solution to fit your needs.




Get In Touch




9759 Inter Ocean Dr.
Cincinnati, OH 45246




2520 Boulevard des Entreprises, Suite 109
Terrebonne, QC. J6X 4J8




422 Commerce Drive East
LaGrange, OH 44050