Specialized Items
PTFE Expansion Bellows
Single layer joints with crossed and laminated PTFE film inner surface, designed to reduce noise and absorb expansion, contraction and minor piping misalignment. Sizes 1" (25 mm) to 8" (200 mm).
Technical specifications
| Dimensional availability | 1–8 in (25–200 mm) nominal bore |
|---|---|
| Tolerances | Face-to-face and flange dimensions to approved drawing; CNC work available to ±0.05 mm where applicable |
| Available grades | Virgin PTFE, 15% Glass-filled PTFE, 25% Glass-filled PTFE, 25% Carbon-filled PTFE, Bronze-filled PTFE |
| ASTM test references | ASTM D4894, ASTM D4745 |
Final dimensions, tolerances and material grade are confirmed against your drawing and service conditions.
Applications & selection
Typical uses
- Vibration damping
- Thermal movement absorption
- Misalignment correction
Industries: Chemical processing, HVAC, Heating systems.
Selecting the right construction
State axial, lateral and angular movement, face-to-face length, cycling and pressure or vacuum duty. Confirm the complete joint rating rather than relying on the polymer's temperature range.
Chemical resistance depends on the polymer, fillers, inserts and process conditions. Confirm the exact medium and concentration; general PTFE properties do not establish a complete assembly's service rating.
Interactive product model
Buyer questions
Where are ptfe expansion bellows used?
Vibration damping, Thermal movement absorption, Misalignment correction. Typical sectors include Chemical processing, HVAC, Heating systems; suitability depends on the actual service conditions.
What sizes can I request for ptfe expansion bellows?
1–8 in (25–200 mm) nominal bore. Final dimensions and tolerances are agreed during quotation.
What should I specify when ordering ptfe expansion bellows?
State axial, lateral and angular movement, face-to-face length, cycling and pressure or vacuum duty. Confirm the complete joint rating rather than relying on the polymer's temperature range.
How is material suitability confirmed for specialized items?
Submit the exact medium, concentration, temperature, pressure and mechanical duty. Grade availability and compatibility are confirmed for the specific construction; an ASTM reference is not a product certification.
Selecting a filled grade? Read our PTFE vs Teflon engineering guide.
Related products
Request a quotation
Include quantity, dimensions or a drawing, required material and the operating medium. Add concentration, temperature, pressure and motion or shaft speed where relevant. Final grade, inspection requirements and service limits are confirmed during quotation.
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