Polytetrafluoroethylene (PTFE), discovered in 1938, has become integral to medical device applications due to its unique properties. This synthetic fluoropolymer, derived primarily from fluorite, is noted for its exceptional non-stick qualities, chemical inertness, and high thermal stability. In medical applications, PTFE tubing is pivotal for its low coefficient of friction and extremely broad working temperature range, making it suitable for critical roles such as protective linings in catheters for delivery channels for medical devices and insulative sheaths in medical electronics.
PTFE medical tubing, with its origins rooted in intricate chemical transformations, begins as a fluorine gas that reacts with hydrocarbon gasses to create PTFE resin. This resin, processed through stages like compression molding and precise extrusion, results in tubing that meets the exacting standards required in medical technologies. Some types of PTFE tubing in medical applications include multi-lumen tubes for complex device pathways, medical heat shrink tubing for encapsulating other components, and ultra-thin-wall tubes for minimally invasive procedures. The key benefits of these in medical devices include its high dielectric strength, resistance to temperature extremes, and biocompatibility, which ensure it performs reliably under rigorous medical use. With its unparalleled chemical resistance, PTFE has become an ideal polymer for the chemical and analytical sciences.
Key Characteristics Of PTFE Medical Tubing
Ultra Thin Wall
High Dielectric Strength
Torque Transmission
Excellent Temperature Withstanability
(Up To 260 °c / 500 °f)
Usp Class Vi Bio Biocompatibility
Sterilizable (Eto)
Excellent Coefficient Of Friction
Excellent Chemical Resistance
High Column Strength
Material Properties Of PTFE Medical Tubing
PHYSICAL
ASTM
PTFE
Density (g/cm3)
D792
2.16 – 2.18
Water Absorption (%)
D570
< 0.01
Oxygen Index (%)
D2863
> 95
MECHANICAL
ASTM
PTFE
Hardness, Shore D
D2240
50 – 65
Ultimate Tensile Strength (MPa)
D638
21 – 35
Elongation at Break (%)
D638
300 – 500
Modulus of Elasticity (MPa)
D638
392
Flexural Modulus (MPa)
D790
490 – 588
Coefficient of Friction
D1894
0.02 – 0.10
ELECTRICAL
ASTM
PTFE
Volume Resistivity (Ω – cm)
D257
< 1.0 × 10¹⁸
Dielectric Constant 1 MHz
D150
2.10
Dielectric Strength (V/mil)
D149
457 – 483
THERMAL
ASTM
PTFE
Thermal Conductivity (W/m – K)
D433
0.025 – 0.3
Maximum Service Temp, Air (°C)
na
260
Melt Temp (°C)
D4591
326 – 327
Decomposition Temp (°C)
AIR
505
Coefficient of Thermal Expansion, Linear 20° (μm/m-°C)
D696
100
General Application Of PTFE Tubing in Medical Tubing
PTFE liners are highly specialized components crafted from polytetrafluoroethylene, known for their superior chemical resistance and low friction properties. These liners are essential in enhancing the performance and safety of medical devices by providing a smooth, inert interface that minimizes interaction with medical substances.
What is a PTFE Liner?
A PTFE liner, or Polytetrafluoroethylene tubing, is a high-performance polymer used predominantly in guiding catheters. Its low friction coefficient allows for effortless navigation of medical instruments within the catheter, enhancing functionality and patient comfort during procedures.
Key Features of PTFE Liners
Chemical Inertness
Low Coefficient of Friction
High Temperature Resistance
Biocompatibility
Sterilizability
Medical Applications of PTFE Liners
PTFE liners are primarily utilized in medical settings where high heat, purity, and chemical inertness are critical. Commonly employed in catheters, vascular stents, and guide wires, these liners ensure smooth, safe device operation and enhance patient care by preventing material degradation and ensuring substance purity during procedures.