A working guide to medical PTFE tubing liners for catheters: how to size the lumen, when to specify etched PTFE, extruded versus cast construction, material comparisons, sterilization, and what to test before design freeze.
A working guide to medical-grade etched PTFE tubing: how sodium and plasma etching create a bondable PTFE surface, single-side versus double-side etching, bonding to Pebax, nylon, TPU, and PU, storage and shelf life, sterilization, and what to verify before design freeze.
A working guide to medical-grade FEP heat shrink tubing for catheter reflow: shrink-ratio and recovered-ID selection, recovery temperature, wall thickness, longitudinal change, process steps, wrinkle and defect troubleshooting, retained-versus-temporary use, and what to put in an RFQ.
A working guide to medical-grade Pebax tubing for catheter shafts: how Shore D grades are chosen by shaft zone, how multi-durometer transitions are formed, how Pebax bonds to an etched PTFE liner, how reflow is controlled, and what to put in an RFQ.
There is no universal answer such as: “Always leave 0.2 mm clearance.” The correct clearance depends on the complete mechanical system. That includes: cable diameter; liner ID tolerance; cable tolerance; ovality; bend radius; lubricant; temperature; contaminants; assembly compression. A useful design therefore starts with a clearance window, not a nominal number. Nominal clearance is not […]
PTFE creates an unusual design problem. The same low surface energy that makes PTFE useful as a sliding liner also makes it difficult to bond. For a free-floating liner, this may be perfectly acceptable. For a multilayer control-cable housing, it may not be. Quick answer Use etched PTFE only when the construction requires the PTFE […]
Most wire bundles look identical once they are bundled. The problem starts months later, when one line needs tracing inside a panel that runs at 200 °C and sits in solvent vapor. Printed markers rub off. Paint does not survive. That is the gap spiral-stripe fluoropolymer heat shrink was built to fill. Direct answer: PTFE spiral […]
Removing a protective jacket usually means a blade. Around a finished wire, a cured part, or a delicate catheter, that blade is the riskiest step in the whole build. A peelable sheath takes the knife out of the process. Direct answer: A peelable PTFE sheath is a PTFE tube with an engineered weak path in its […]
You cannot thread PTFE pipe the way you thread steel. Cut a thread into fluoropolymer and the first torque either strips it or cold-flows it into a leak. So fluoropolymer lines are joined the thread-free way: a flange or a flare. Direct answer: Flanging forms a flat rim on the pipe end that seats against a […]
A food line lives or dies on what the fluid touches. If the tube reacts with the product, holds taste, or traps residue in its bore, no amount of downstream cleaning fixes it. PTFE is the quiet default for the lines where that matters. Direct answer: PTFE (Teflon) tubing is a sanitary, chemically inert fluid path […]
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