Our Polyether Ether Ketone PEEK Injection Molding Services

Step 1: Material Preparation (Drying)​

PEEK is hygroscopic (absorbs moisture), which causes bubbling and voids in finished parts. We dry PEEK pellets in a dehumidifying dryer at 150 °C for 4 hours (critical for maintaining material integrity). For medical-grade PEEK, we use nitrogen-purged dryers to prevent contamination.​

Step 2: Mold Design & Preparation​

• Gate & Runner Design: We use hot runners (instead of cold runners) to minimize PEEK waste (hot runners keep material molten, reducing scrap by 25–30%). Gates are placed to avoid shear stress (PEEK is sensitive to excessive shear, which degrades its strength).​

• Mold Temperature Control: Molds are heated to 150–200 °C (via oil or electric heaters) to promote uniform crystallization—this ensures dimensional stability and prevents warping. For thick parts, we use gradient heating (warmer at the core, cooler at the surface).​

Step 3: Injection Molding Machine Setup​

• High-Heat Barrel Settings: Barrel zones are set to a temperature gradient (feed zone: 360 °C; melt zone: 380–400 °C; nozzle: 390–410 °C) to melt PEEK without thermal degradation.​

• Inert-Gas Venting: We purge the mold cavity with nitrogen during injection to remove air (PEEK’s high viscosity traps air easily, leading to defects). This step is mandatory for parts like semiconductor clamps (where even tiny voids cause failure).​

Step 4: Injection & Packing​

• Injection Speed: Slow to moderate (50–100 mm/s) to control shear (excessive shear reduces PEEK’s tensile strength by 10–15%).​

• Packing Pressure: 80–90% of injection pressure, held for 10–20 seconds to compensate for shrinkage (PEEK shrinks 1.5–2.5% during cooling).​

Step 5: Cooling & Demolding​

Cooling time varies by part thickness (10 seconds for thin parts, 60 seconds for thick sections). We use controlled cooling to maintain crystallinity (target: 35–40% for most applications; higher for structural parts, lower for flexible components). Demolding is done with gentle ejectors to avoid scratching (critical for medical implants).​

Step 6: Post-Processing & Quality Control​

• Annealing: Parts are heated to 180–200 °C for 1–2 hours, then cooled slowly (5 °C/min) to relieve internal stresses. This step improves dimensional stability by 20–25%.​

• SPC Monitoring: We use Statistical Process Control (SPC) to track key parameters (temperature, pressure, cycle time) in real time. Any deviation beyond ±2% triggers an alert, ensuring consistent quality.​

• Inspection: Parts undergo dimensional testing (CMM), mechanical testing (tensile strength per ASTM D638), and visual inspection (for defects like flash or voids).

• Extreme Temperature Resistance: PEEK maintains 90% of its strength at 240 °C (continuous use) and can withstand short-term exposure to 300 °C. This outperforms aluminum (loses strength at 200 °C) and PPS (continuous use limit: 200 °C).​

• Chemical Inertness: Resistant to oils, solvents, acids, and bases (even concentrated sulfuric acid at room temperature). Unlike metals, it won’t corrode—ideal for oil & gas and chemical processing parts.​

• Steam & Radiation Sterilizable: Can undergo 1,000+ autoclave cycles (134 °C, 3 bar) and is resistant to gamma radiation (25 kGy). This makes it the top choice for reusable medical instruments.​

• Superior Strength-to-Weight Ratio: PEEK has a density of 1.32 g/cm³ (50% lighter than steel) but tensile strength comparable to aluminum. For aerospace parts, this reduces fuel consumption by 5–10%.​

• Wear Resistance: Carbon-filled PEEK has a wear rate 10x lower than nylon and 2x lower than bronze—perfect for bearings and sliding components that operate without lubrication.​

• Low Outgassing: Emits minimal volatile organic compounds (VOCs) when heated. This meets NASA’s outgassing standards (ASTM E595), making it suitable for space applications.​

• Biocompatibility (USP Class VI): Implantable PEEK-OPTIMA is compatible with human tissue, causing no immune response. It’s used in spinal cages, hip cups, and dental implants.​

• Dimensional Stability: Low coefficient of thermal expansion (CTE: 3.1–5.5 × 10⁻⁵/°C) and minimal shrinkage (1.5–2.5%) ensure parts retain their shape in temperature fluctuations.​

• Metal Replacement: PEEK parts cost 20–30% more upfront than metal but last 3–5x longer (no corrosion, less wear). For example, a PEEK turbine bushing replaces a steel one, cutting maintenance costs by 60%.

Case Study 1: PEEK Turbine Bushing for Oil & Gas (60% Weight Reduction)​

• Challenge: A global oilfield services company needed to replace steel turbine bushings in down-hole pumps. The steel parts were heavy (adding 15 lbs to each pump), corroded in saltwater (failing after 6 months), and required frequent lubrication—driving high maintenance costs.​

• Solution: We recommended carbon-filled PEEK (Solvay Ketaspire KT-820 CF30) for its wear resistance, chemical inertness, and lightweight properties. Our thick-section molding capability handled the bushing’s 20mm thickness, while inert-gas venting eliminated voids (critical for withstanding down-hole pressure of 20 ksi). We also added a PVD tungsten carbide coating to boost wear resistance.​

• Result: The PEEK bushings weighed 60% less than steel (3 lbs vs. 7.5 lbs per unit), reducing pump total weight by 12 lbs. They resisted saltwater corrosion and operated without lubrication, extending service life to 3 years (6x longer than steel). Maintenance costs dropped by $250,000 annually per rig, delivering a 3:1 ROI in 8 months.​

• Customer Testimonial: “The PEEK bushings transformed our pump reliability. We’ve cut maintenance visits by 80%—a game-changer for remote offshore rigs.” — Oilfield Operations Director​

Case Study 2: Spinal Implant for Medical Device Maker (30-Day Launch)​

• Challenge: A medical device startup needed a spinal fusion cage for orthopedic trials. The part required implantable PEEK-OPTIMA (USP Class VI compliant), tight tolerances (±0.01mm) for bone fit, and a porous surface for tissue integration. The startup had a strict 30-day timeline to meet FDA trial deadlines—far faster than the industry’s typical 8–10 week lead time for medical PEEK parts.​

• Solution: We leveraged our 24-hour prototyping capability to create a 3D-printed PEEK prototype in 48 hours for fit testing. For production, we used our clean-room ISO 7 facility to avoid contamination, and chromic acid etching to create the porous surface (enhancing bone integration). Our lot traceability (FDA/UDI) system tracked every step—from PEEK-OPTIMA raw material batch to finished implant.​

• Result: We delivered 50 implantable cages in 28 days (2 days ahead of schedule), meeting the startup’s trial deadline. The cages passed all biocompatibility tests (ISO 10993) and achieved 90% tissue integration in pre-clinical trials. The startup later scaled production to 500 units/month using our multi-cavity tools, cutting per-unit cost by 35%.​

• ROI Analysis: The accelerated launch let the startup begin clinical trials 3 months early, positioning them as a first-mover in the spinal implant market—projected to generate $2M in additional revenue in the first year.​