PEEK and PTFE Injection Molding | Custom Mold Solutions

Q: 1.How do you ensure quality control in plastic injection molding?

We are a ISO 9001 certificated company. We ensure quality control in plastic injection molding through a multi-faceted approach which includes material testing, precise machine calibration, meticulous mold design and maintenance, and stringent inspection processes.

Q: 2. How do the DFM report work?

A Design for Manufacturability (DFM) report is a crucial document that evaluates the manufacturability of a product's design, aiming to identify and address potential manufacturing issues before they arise. Reports help identify and address potential issues early in the design phase, preventing costly changes later. Cost Efficiency: By optimizing designs for manufacturability and testability, reports help reduce production costs and increase yield. Quality Assurance: Thorough testing ensures that the final product meets quality standards and performs reliably.

Q: 3. What is the typical lead time for injection molding?

Mold fabrication usually takes 4–8 weeks, while production lead time depends on part complexity and quantity.

Q: 4. What is the difference between a prototype mold and a production mold?

Prototype molds are faster and cheaper, often using aluminum; production molds use hardened steel for high-volume runs.

Q: 5. Can you do small batch injection molding?

Yes. With standardized tooling and soft molds, small batches (hundreds to thousands) are feasible.

PEEK and Moldable PTFE Injection Molding Solutions

PEEK is a high-performance engineering plastic that requires specialized injection molding processes. Melting temperatures must reach 370–400°C, and mold temperatures are tightly controlled at 160–200°C to manage crystallization. Additionally, the material's high abrasiveness and thermo-sensitivity present significant challenges.

PTFE, on the other hand, is a different story. When we talk about "injection moldable PTFE," we're really talking about PFA, FEP, and ETFE — melt-processable fluoropolymers that behave more like conventional thermoplastics.

PFA (processable PTFE) is the closest injection-moldable cousin to PTFE. Melt temperatures need to reach 350–400°C, and molds must be heated to 150–200°C — which almost perfectly overlaps with PEEK's 360–400°C / 160–200°C window. But PFA has a headache that PEEK doesn't: in the molten state, it corrodes standard steel. Screws, barrels, and molds all need corrosion-resistant alloys, and mold cavities are best nickel-plated. PFA also has fairly high melt viscosity, so gates and runners need to avoid sharp corners — otherwise you get melt fracture.

FEP processes at slightly lower temperatures but still needs dedicated corrosion-resistant equipment. Its upper service temperature is around 200°C, lower than both PFA and PTFE, so it's limited in high-temperature applications.

ETFE is the "easiest to mold" of the bunch. Melt temperature is 293–343°C, mold temperature only 65–149°C — much gentler than PEEK or PFA. Its tensile strength is also on the higher side for this family, around 45 MPa. Still nowhere near PEEK, but a "tough guy" among fluoroplastics.

Characters	PEEK	Injection-Moldable Fluoropolymers (PFA/FEP/ETFE)
Corrosivity	Basically non-corrosive to metal; standard wear-resistant screw works	PFA/FEP molten resin corrodes steel — nickel-based alloys or chrome plating required
Melt Flow	Viscous, but still a "normal" thermoplastic	Extremely high melt viscosity; injection speed must be very slow — a single shot can take 60 seconds; go faster and you get melt fracture
Why Heat the Mold	To control crystallinity, which affects final mechanical properties	To let the melt fill the cavity — the fluoropolymer is already essentially fully crystallized
Demolding	Relatively normal; proper draft angles are enough	Difficult — fluoroplastics are so "slippery" they're hard to grip; special ejection design needed
Post-Processing	Usually needs annealing to relieve internal stress and stabilize dimensions	Generally not needed, but shrinkage is high — mold design must compensate for it upfront

PEEK vs. PFA, FEP & ETFE — Comprehensive Comparison

Property	PEEK (Unfilled)	PFA	FEP	ETFE
Tensile Strength	97–100 MPa	~20–27 MPa	~17–20 MPa	~34–45 MPa
Flexural Modulus	3.8–4 GPa	~0.55–0.9 GPa	~0.65–0.9 GPa	~1.4 GPa
Working Temperature	Long-term 250°C	Continuous 260°C	Continuous ~204°C	Continuous ~150°C
Wear Resistance	Good, self-lubricating	Low; prone to creep, not for high-load wear	Low; similar to PFA, soft	Best among fluoropolymers; tough, abrasion resistant
Chemical Resistance	Very broad (pH 2–14), not resistant to strong oxidizing acids	Near-universal; similar to PTFE	Near-universal; similar to PTFE	Good, but not universal; less resistant than PFA/FEP, especially to strong bases
Typical Applications	Precision structural parts, bearings, seals, medical implants	High-purity fluid handling, semiconductor components, chemical delivery systems	Cable liners, sensor tubing, low-friction sleeves	Wire insulation, chemical tank linings, thin-wall abrasion-resistant parts

How to Get Qualified PEEK and Moldable PTFE Parts

1. Superior Materials for PEEK & Teflon Molds

We manufacture PEEK & Teflon mold components from carbide and premium powder metallurgy steels, precision-machined and mirror-polished for optimal performance. Optional wear-resistant coatings further extend mold life. This ensures dimensional stability and longevity under continuous high-temperature, high-pressure operation.

2. Precision Temperature Control for Crystallization

Our molds feature independently controlled heating and cooling circuits with high-accuracy controllers capable of ±1°C precision. Thermal insulation between plates minimizes heat loss, ensuring uniform temperature distribution and consistent part quality.

3. Optimized Flow and Venting

Hot runner systems are designed with enlarged runners and gates to reduce shear heat and flow resistance, preventing material degradation and ensuring smooth filling.

4. Special Ejection & Cooling Systems

Stainless steel cooling circuits eliminate corrosion risks and ensure consistent heat dissipation over the long term. Ejection systems are specifically engineered for reliable high-temperature operation.