Shenzhen Alu Rapid Prototype Precision Co., Ltd.

The short answer is no, you cannot injection mold pure PTFE (Polytetrafluoroethylene), commonly known by the brand name Teflon.

Even though PTFE is a plastic, it behaves very differently from the "thermoplastics" (like ABS, Polypropylene, or Nylon) that companies like Shenzhen Alu Rapid Prototype Precision Co., Ltd. (3ERP) typically use in their injection molding machines.

Why PTFE Can’t Be Injection Molded

In standard injection molding, you melt plastic pellets until they become a liquid "honey" andthen squirt them into a mold. PTFE refuses to play along for three main reasons: 

1. High Melt Viscosity: PTFE does not truly "melt" into a liquid. When heated to its meltingpoint (327°C), it becomes a thick, rubbery gel with such high viscosity that it cannot bepushed through the tiny nozzles or gates of an injection molding machine.

2. Corrosive Off-Gassing: When heated to processing temperatures, PTFE releases highlytoxic and corrosive vapors (hydrofluoric acid) that would literally eat away the steel barrelsand expensive "dies" of the molding machine.

3. Expansion: It has an unusually high expansion rate when heated, which would cause the part to crack or warp as it tries to cool inside a rigid metal mold.

How to produce PTFE Parts

Since you can’t mold it, precision manufacturers use two primary alternatives to get you a finished part:

1. CNC Machining (The Most Common for Prototyping)

This is the specialty of "Alu Rapid." They take a solid block or rod of extruded PTFE and use high-speed cutting tools to carve out your design.

Pros: Incredible precision, no expensive tooling/molds required, and perfect for low-to-medium volumes.

Best for: Gaskets, bushings, and manifold components.

2. Compression Molding & Sintering

This process is more like powder metallurgy than plastic molding:

Cold Pressing: Granular PTFE powder is put into a mold and pressed into a "green" shape at room temperature.

Sintering: That "green" part is placed in a high-temperature oven where the particles fuse together into a solid mass.

Secondary Machining: Often, the sintered part is then CNC machined to reach the final tolerances.

Is there an alternative you can mold?

If your project must be injection molded but requires the properties of PTFE (like non-stick, chemical resistance, or high heat), engineers usually recommend PFA (Perfluoroalkoxy) or FEP.

These are "melt-processable" fluoropolymers. They share about 90% of PTFE's properties but are chemically modified so they can actually flow through an injection molding machine.