High-temperature non-metallic expansion joints are used primarily in flue and duct systems, and depending upon the specific operating conditions, are built up of a number of insulating thermal fabric layers with an external fluoroplastic cover. These materials can withstand up to 2300º F. These composite joints are usually located where low spring rates are combined with large axial and lateral movements. These expansion joints are very economical to use and can be adapted to unique, limited space situations.

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Non-metallic, low-temperature elastomeric expansion joints are found in duct & flue systems where operating temperatures are less than 400º F. Bachmann Dampjoint uses molded or belted elastomers with non-asbestos reinforcing materials. They are more effective than other materials in these situations because of their high resistance to acid and abrasion and their ability to absorb large movements in short face-to-face dimensions.