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9759 Inter Ocean Drive
Cincinnati, Ohio 45246
513-874-8915 phone
513-874-1343 fax

NON-METALLIC JOINTS
COMPOSITE EXPANSION JOINTS
ACCESSORIES
 
METALLIC JOINTS
DESIGN PARAMETERS
DESIGN GUIDELINES
COMPOSITE EXPANSION JOINTS

A composite expansion joint consists of layers of material bounded, sewn, or mechanically fastened together along the edges.  Each layer of material is designed to function independently of the others.

 

The EFLEX™Fluoroflex composite expansion joint is recommended for temperature applications from 400ºF (205ºC) in excess of 1500ºF (815ºC).  The EFLEX™ Fluoroflex material used as the outer layer of the composite expansion joint consists of woven fiberglass surrounded by fluoropolymer resins providing excellent chemical resistance.

A typical construction profile for an EFLEX™ Fluoroflex composite expansion joint is as shown below:

1 - OUTSIDE LAYER / COVER
This is a fluoropolymer material (Fluoroflex) which can operate in the flue duct atmosphere at a continuous service temperature of 600ºF (315ºC)with excursions to 650ºF (345ºC).  This layer serves as a gas seal.

2 - TFE LAYER  
This is a sheet of skived Teflon.  It is highly resistant to chemicals and functions as a vapor (gas) barrier.

3 - LAYER FIBERGLASS
This layer acts as an insulator and gives the expansion joint durability and strength.

4 -LAYER / INSULATION
This layer protects the cover and the vapor barrier from heat degradation. The thickness of this layer is determined to ensure that the heat transfer from the flue gas is reduced to a point less than the maximum tolerance of the cover and the vapor barrier.

5 - LAYER FIBERGLASS / CLOTH
This layer acts as an insulator and adds strength to the expansion joint.

6 - INSIDE LAYER / TUBE
This layer is a close weave material that binds the belt together, acts as an insulator, and gives the belt a finished appearance.  The edge of this layer is hemmed and rolled over the edge of the expansion joint to form a cuff; this cuff establishes a barrier between the cover and the back-up bar.  It protects the cover from any excessive heat which may be conducted into the back-up bar through the fasteners.

 



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