Dura-Perm PTFE Lined Spool Type
Unaflex® Dura-Perm Expansion Joints combine the best features of PTFE/FEP with the best features of elastomeric expansion joints. PTFE available in 1” through 12” and FEP available in 14” through 96” I.D. standard face-to-face 
dimensions, or special lengths. Available in multiple arch configurations, or as straight pipe (see flexible pipe section). Flanges are available as raised-face dimensional flares or full-face.
Note: 1/2” to 1-1/2” sizes are flared to raise face dimension only.
- They are recommended for use in the chemical and pulp paper industries because of their capabilities to resist corrosive attack, high temperatures and pressures.
- Chemical resistance/anti-stick properties
- Noise and vibration dampening/high flexibility
- Thermal stability/resistance to age cracking
- High pressure rating/temperature rating of 400 degrees
Control Units
Excess elongation, caused by shifting of pipelines may seriously damage rubber expansion joints. This damage can occur when:
- Necessary support is not provided for the weight of the pipeline low temperatures in the line are encountered
- The lines on the pressure side of the air compressors are not anchored properly. Such destructive elongation can be controlled with Unaflex® control units.
In general, control units are always recommended as an additional safety factor, preventing damage to the connector and associated equipment. Our experts will recommend the units appropriate for your installation. (PTFE, more commonly known by the brand name Teflon® by DuPont™ is Polytetrafluoroethylene). PTFE is a synthetic fluoropolymer which finds numerous applications.
Unaflex® does not use marginal constructions which reduce safety factors and cause pressure reductions with slight operating temperature increases.
