Non-Metallic Expansion Joints

Expansion joint design typically includes non-metallic (fabric), rubber and metallic fabrications. Non-metallic expansion joints can include a single ply of rubberized material or a composite made of multiple layers of heat and corrosion-resistant flexible material. These layers typically include an outer cover that works as a gas seal; Teflon®, Viton® or other corrosion-resistant materials, a layer of fiberglass that functions to insulate and supply additional strength for durability; several layers of insulation to ensure heat transfer from the flue gas is optimized to the required temperature.
At Zepco, having worked with expansion joints for over 30 years, we see several advantages to non-metallic expansion joints:

• Fabric expansion joints move in any direction (axially, laterally or rotationally) on X, Y and Z-axes. Metal moves one way only, laterally or axially. Additionally, fabric expansion joints are superior in absorbing twisting movements caused by differential heating.

• Non-metallic expansion joints are more effective in isolating vibration and mitigating noise.

• Corrosion-resistance is greatly enhanced with fabric construction.

• Non-metallic expansion joints are significantly less expensive to fabricate, ship, assemble and install. Just as important, repair and replacement are less costly.
For more information about the benefits of non-metallic expansion joints, please contact Zepco with any questions or comments.

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