Flared and flanged tips are two common ways of modifying the ends of fluoropolymer tubing to support secure and functional connections. While both serve to improve sealing or mechanical attachment, they are formed differently and used in distinct situations.

Flared Tip

A flared tip involves shaping the tubing end into a smooth, tapered cone, typically at a 37° or 45° angle. This method is commonly used in applications where chemical resistance and leak-free performance are essential.

Key Features:

·      Creates a conical seal surface for use with compression fittings or metal seats

·      Minimises flow disruption by avoiding additional parts

·      Common in fluid systems that require high purity and chemical resistance

·      Typically used with PFA, FEP, or PVDF tubing

·      Formed using controlled heat and precision dies for repeatable results

Flared ends are often chosen for systems under constant pressure or where the integrity of the flow path is a critical factor.

Flanged Tip

A flanged tip forms a flat, widened rim around the tubing’s edge. This design allows the tube to be clamped or fastened against a flat surface, usually in combination with a gasket.

Key Features:

·      Provides a mechanical interface for securing the tubing in assemblies

·      Often used in tank walls, bulkhead panels, or containment vessels

·      Compatible with clamp systems and flat-faced fittings

·      Supports better load distribution in mounted applications

·      Can be formed with heat and pressure using flange dies or collars

Flanged tips are typically selected when a mechanical fixing or panel connection is required, rather than a direct fluid seal.

Practical Considerations

Both terminations need to be matched with suitable hardware. For flared ends, improper torque or misaligned fittings can compromise the seal. For flanged ends, the surface finish of the flange and the mating surface must be even to ensure proper compression.

Best practice includes:

·      Using clean, defect-free surfaces

·      Following the tubing manufacturer’s fitting recommendations

·      Checking alignment before tightening

·      Verifying that the material and termination type suit the temperature and pressure conditions of the system

Adtech’s Capabilities

Adtech offers in-house flaring and flanging for a wide range of fluoropolymer tubing, including PTFE, FEP, PFA, and PVDF. Our processes support tight tolerances, consistent forming, and compatibility with common industry fittings. Whether you’re working on fluid transfer, chemical dosing, or panel-mounted assemblies, we can supply terminations tailored to your application.

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