Core and Cavity for Injection Molding
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PTFE (Teflon) Injection Molding Service
Durable, heat-resistant PTFE parts made with precision. RapidDirect offers fast turnarounds, reliable quality, and cost-effective solutions to tackle your toughest manufacturing challenges.
PTFE (Teflon) in Injection Molding
Polytetrafluoroethylene (PTFE), commonly known by the brand name Teflon, is a high-performance fluoropolymer with excellent chemical resistance, low friction, and high-temperature stability.
Although PTFE is typically associated with extrusion and compression molding, advances in technology have enabled its use in injection molding. This process allows to produce complex and precise PTFE components, expanding its application possibilities.
PTFE requires careful procession and often undergo pre-sintering before injection molding to enhance its flow characteristics and reduce the risk of voids and defects in the final product. Furthermore, due to its high shrinkage rate, the molds design should incorporate measures to compensate for shrinkage compensation.
| Price: | $$ | Available PTFE (Teflon) at RapidDirect: | Teflon (PTFE) Black, Teflon (PTFE) White |
|---|---|
| Lead Time: | < 5 days |
| Wall Thickness: | 0.5mm |
| Tolerances: | ISO2768-C |
| Max Part Size: | 300 mm x 300 mm x 300 mm |
Plastic PTFE (Teflon) Properties
| Properties | Value |
|---|---|
| Density | 2.1 - 2.3 g/cm³ |
| Tensile Strength | 20 - 35 MPa |
| Elongation at Break | 200 - 400% |
| Thermal Conductivity | 0.25 W/m·K |
| Melting Point | 327°C |
| Coefficient of Friction | 0.05 - 0.10 |
| Coefficient of Thermal Expansion | 100 - 170 x 10^-6 /°C |
| Impact Resistance | Low to Moderate |
| Chemical Resistance | Excellent against almost all chemicals |
| Water Absorption | < 0.01% |
| Electrical Properties | Excellent dielectric properties |
| Flammability | Non-flammable |
Pros and Cons of PTFE Injection Molding
PTFE plastic offers many benefits that make it suitable for injection molding. However, there are some of its downsides to consider before choosing it for any project.
Pros
- Superb Chemical Resistance: Ideal for harsh chemical environments.
- Excellent Electrical Insulation: Maintains integrity in electrical applications.
- Wide Temperature Range Suitability: Performs consistently across extreme temperatures.
- Low Friction Coefficient: Reduces wear and enhances performance in moving parts.
- Minimal Water Absorption: Maintains dimensional stability in humid conditions.
Cons
- Limited Color Options: Primarily available in black or white, limiting aesthetic choices.
- High Processing Temperature: Requires specialized equipment and higher processing temperatures.
- Surface Finish Challenges: Achieving high-gloss finishes can be challenging.
- Higher Cost: PTFE material costs more than standard thermoplastics.
- Low Impact Strength: Vulnerable to impact damage compared to some other plastics.
Applications of Injection Molded PTFE Parts
3D printed PTFE parts are widely used across various industries, including:
- Chemical Industry: Valves, seals, and gaskets.
- Electrical Engineering: Insulators and connectors.
- Medical Devices: Surgical instruments and components
FAQs
Designers must carefully consider PTFE’s low coefficient of friction and high thermal expansion when designing parts. These properties impact mold filling, part release, and dimensional stability during cooling. Optimal design practices include draft angles to facilitate ejection, minimizing undercuts, and ensuring uniform wall thickness to prevent warping.
Yes, PTFE is FDA-approved for food contact and widely utilized in medical applications due to its biocompatibility and inert nature. It is used in food processing equipment like seals, gaskets, and liners, where resistance to chemicals and high temperatures is essential. In medical devices, PTFE’s non-reactive properties make it suitable for implants, surgical instruments, and catheters, ensuring patient safety and product reliability.
PTFE injection molding can achieve a range of surface finishes from smooth to textured, tailored to specific functional and aesthetic requirements. Smooth finishes enhance part release and cleanability, ideal for food processing equipment. Textured surfaces improve grip and friction properties, beneficial for handles and grips in medical devices. Specialized surface treatments like etching or polishing can further refine surface characteristics, enhancing PTFE’s performance in various applications.
Lead times for PTFE injection molding projects generally span 4 to 6 weeks, contingent upon factors such as part complexity, mold design intricacy, and production volume. Customization requirements, including surface finish and dimensional tolerances, may influence lead times. RapidDirect ensures efficient project execution, employing advanced molding techniques to meet stringent quality standards and deliver reliable PTFE parts within specified timelines.
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