Convoluted PTFE Tubing

BESTYIELD Technology (Huizhou) Co., Ltd. is one of the leading manufacturers and suppliers of convoluted ptfe tubing in China, also supports customized service. Welcome to wholesale bulk convoluted ptfe tubing in stock here and get pricelist from our factory. For price consultation, contact us.

 

The PTFE 903 series features a convoluted (corrugated) construction that delivers exceptional multi-axis flexibility for PTFE chemical resistance in space-constrained installations. Key design attributes include:

• Convoluted tubing: PTFE (Polytetrafluoroethylene) - wave-form geometry provides axial compression, extension, and lateral offset capability
• Color: Natural or multiple colors - natural PTFE for standard chemical service; color options for system traceability
• Temperature range: -150°C to +250°C - extreme low-temperature cryogenic service to high-temperature chemical processing
• Compliance standards: RoHS, REACH - full compliance with European environmental directives
• Flame resistance rating: HB, V1, V2 - self-extinguishing and limited-burn classifications

 

The 903 series features a convoluted (corrugated) PTFE construction that fundamentally differs from smooth-bore PTFE tubing. The wave-form geometry provides axial flexibility - the hose can compress, extend and bend simultaneously without kinking or collapsing. This makes it the ideal solution for routing PTFE-lined hoses through tight spaces with complex 3D paths, such as inside equipment racks, around pipe obstructions, or within robotic arm cable carriers. The convoluted design also absorbs thermal expansion and vibration, reducing stress on connected equipment.

Without external braid, the 903 series prioritizes flexibility over pressure capacity, serving low-pressure gravity-feed, siphon, and vent applications. For pressurized service, the 804 series adds an outside braid for reinforcement while maintaining convoluted flexibility.

The convolution forming process involves heating smooth-bore PTFE tubing to approximately 35°C above its crystalline melting point, then mechanically forming the corrugations using precision mold tooling. Each convolution peak and valley is dimensionally controlled to ±0.3mm, ensuring consistent flexural behavior along the entire hose length. The resulting geometry provides 5-10× greater axial flexibility compared to equivalent-diameter smooth-bore PTFE tubing, with minimum bend radii as low as 11mm for the smallest size. The convoluted interior does increase flow resistance relative to smooth-bore tubing, so this series is best suited for low-flow applications where flexibility is the primary selection criterion.

 

The 903 series is widely specified for internal equipment routing in semiconductor tool platforms, analytical instruments, and medical devices where PTFE chemical resistance is needed but space constraints prevent the use of rigid straight-bore tubing. In robotics, these hoses serve as flexible conduits for purge gas delivery to end-effectors, navigating multi-axis cable carriers with bend radii as tight as 11mm (3/16" size). Process equipment manufacturers use 903 series convoluted PTFE as expansion joints between rigid PTFE-lined pipes, accommodating thermal growth up to ±15mm per 300mm hose length. Laboratory equipment OEMs specify these hoses for reagent dispensing lines where frequent equipment reconfiguration demands easy rerouting.

Medical device manufacturers select the 903 series for instrument flush lines and drainage tubes in diagnostic analyzers, where the convoluted PTFE tolerates repeated flexing during drawer and door movements without fatigue cracking. In the chemical laboratory sector, these hoses connect fume hood service outlets to bench-top apparatus, absorbing the positional adjustments researchers make during experiment setup. The 903 series is also used in food processing equipment as vent lines for steam and condensate, where PTFE purity ensures no taste or odor transfer to food products.

 

Part Number	Hose I.D.		Hose O.D.		MIN. Bend Radius
	inch	mm	inch	mm	inch	mm
903-01	3/16	4	0.24	6	7/16	11
903-02	1/4	6	0.31	8	9/16	15
903-03	5/16	8	0.39	10	3/4	19
903-04	3/8	10	0.47	12	7/8	23
903-05	1/2	12	0.55	14	1	25
903-06	9/16	14	0.63	16	1-3/16	30
903-07	5/8	16	0.75	19	1-7/16	37
903-08	3/4	19	0.87	22	1-11/16	43
903-09	1	25	1.14	29	1-3/4	45

 

• Remarks: Inner and outer diameter sizes are customizable.

 

Proper bending technique is critical for maintaining the structural integrity and service life of convoluted PTFE hoses. The minimum bend radius for each size is listed in the parameter table above - these values must never be exceeded during installation. Bending should be performed by hand only; the use of heat guns or mechanical bending tools is strictly prohibited, as localized overheating can cause permanent deformation of the PTFE convolution geometry.

For horizontal hose runs, support clips should be installed at intervals no greater than 300mm to prevent sagging between mounting points, which can concentrate stress at individual convolutions. When routing requires the hose to twist along its length, swivel fittings must be installed at both ends to absorb the torsional load - direct torsion on the convoluted PTFE body can cause premature crack initiation at the convolution roots.

Vibration isolation mounting clips with rubber inserts should be used near equipment connections to prevent resonance fatigue. For thermal expansion compensation, calculate the expected movement using PTFE's.

 

Our manufacturing facility produces over 1000 pcs of convoluted PTFE tubing per day, with standard sizes maintained in inventory for same-day shipment on orders placed before 2:00 PM local time. This production capacity ensures consistent supply for high-volume OEM accounts while maintaining the flexibility to accommodate project-based orders.

Custom convolution profiles are available for OEM projects requiring specific flexural stiffness, convolution pitch, or overall diameter constraints - minimum order quantity is 100 meters per profile. Our engineering team works directly with customer design departments to optimize convolution geometry for the intended application, including finite element analysis of bend behavior and fatigue life prediction.

We offer a free sample program allowing up to 5 samples per customer (freight collect) for qualification testing and prototype evaluation. Technical support inquiries receive a response within 24 hours, with detailed application engineering assistance available for complex routing challenges.

 

 

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