The Differences Between PTFE Extrusion Rods and Molded Rods

Polytetrafluoroethylene (PTFE) is a versatile material known for its high chemical resistance, low friction and excellent insulation properties. Polytetrafluoroethylene is widely used in various industries and can be made into ptfe rods by different processes, mainly extrusion and molding. Understanding the differences between PTFE extrusion rods and molded rods is crucial to choosing the right type for a particular application. This paper aims to compare these two types of PTFE rods by examining their manufacturing processes, properties and applications.

What is ptfe extrusion rod?

ptfe extrusion rods are used to extrude PTFE materials into continuous rod or other shaped PTFE products by heating and pressurizing them through specific shaped holes in the mold.

ptfe rods
ptfe rod

Production process

The extrusion process for ptfe rods involves forcing the PTFE material through a mold to create long, continuous rods. Before extrusion, the material is usually mushy. The process allows for the production of rods with a consistent cross section over an extended length.


Extruded ptfe rods are known for their uniformity and consistency along their length. They tend to be more flexible than molded rods, making them suitable for applications that require a certain degree of bendability. The extrusion process also results in a smoother surface finish. In addition, extrusion allows the production of longer rods without joints or seams, which is beneficial for applications of materials that require continuous lengths.

Application program

Because of its properties, extruded ptfe rods are commonly used for electrical insulation, where long, seamless lengths are required. They are also used for seals and gaskets, benefiting from their flexibility and uniformity. Bearings and bushings made from extruded PTFE rods take advantage of the material’s smooth surface and ability to be produced in a long, continuous form.

what is ptfe molded rod

ptfe molding rods are cylindrical parts made of ptfe powder compressed into a mold under high pressure and then sintered. This process produces a dense, uniform bar.

ptfe rods

Production process

The molding process for the ptfe rod involves compressing the ptfe powder into a mold under high pressure and then sintering it at high temperatures. Compared with extruded rods, the rods produced by this process have higher density and uniformity.


Molded ptfe rods are generally harder and less flexible than extruded ones. Due to the molding process, they exhibit higher compressive strength. Molded rods can also be produced with larger diameters, which are not feasible for extrusion. The increased density and uniformity contribute to the overall strength and durability of the rod.

Application program

Moulded ptfe rods are ideal for applications requiring high strength and rigidity, such as heavy-duty bearings and structural components. Their high chemical resistance makes them suitable for working with harsh chemical environments. In addition, given their durability and strength, molded rods are preferred in applications with high wear resistance.

Comparison of polytetrafluoroethylene extrusion rod and molded rod

Manufacturing process variance
The main difference between extruded and moulded ptfe rods is their manufacturing process. Extrusion is the process of forcing material through a die, resulting in long, continuous rods with uniform cross sections. In contrast, molding compresses ptfe powder into a mold, producing rods with higher density and strength but limited length.

Attribute difference

Extrusion rods are characterized by their consistency, flexibility, smooth surface, and ability to produce at long lengths. Molded rods, on the other hand, are more rigid, stronger, and have a larger diameter. These differences stem from inherent differences in the manufacturing process.

Application differences

The choice between extruded and moulded PTFE rods depends on the specific application requirements. Extrusion rods are suitable for applications that require flexibility, uniformity and continuous length, such as electrical insulation and sealing. For applications that require high strength, rigidity and larger dimensions, such as heavy machinery parts and environments with harsh chemicals, molded rods are preferred.


Understanding the differences between PTFE extrusion rods and molded rods is crucial to choosing the right type for a particular application. While extrusion rods offer flexibility, uniformity and long continuous length, molded rods offer higher strength, rigidity and larger diameters. Recognizing these differences ensures the appropriate use of ptfe rods in a variety of industrial applications, highlighting the importance of manufacturing processes that determine the properties of materials.

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