I process PEEK CF30 granules by controlling moisture, applying a sufficiently high melt temperature, using a heated mold, and validating the settings with molded-part inspection. As a practical starting point, I dry the material at approximately 150°C for 3–4 hours, set the melt system within a typical PEEK processing range of about 370–400°C, and use a mold temperature commonly around 160–200°C. These are starting points rather than universal specifications, so I always confirm the exact processing window in the grade-specific technical data sheet before production.
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PEEK CF30 generally refers to PEEK reinforced with approximately 30% carbon fiber by formulation, but the exact fiber type, sizing, additives, and recommended parameters can vary between suppliers. Carbon fiber improves stiffness, strength, dimensional stability, and thermal performance, while also increasing sensitivity to flow orientation, abrasive wear, and fiber-related surface effects. For this reason, successful injection molding requires both polymer processing control and composite-material discipline.
Before opening a bag, I check the material identification, lot number, packaging condition, and technical data sheet. Not every PEEK CF30 grade has the same viscosity, fiber length, additive package, shrinkage behavior, or recommended temperature range. A grade designed for structural components may process differently from one developed for wear parts, electrical components, or high-dimensional-accuracy applications.
I also confirm whether the granules are virgin material, regrind-containing material, or a special compound with additional fillers. The permitted regrind ratio should never be assumed because repeated thermal and shear history can change flow and fiber distribution. For qualification work, I normally begin with virgin material unless the supplier has specifically approved a controlled regrind procedure.
Although PEEK has relatively low moisture sensitivity compared with many engineering polymers, moisture and surface contamination can still contribute to splay, bubbles, silver streaks, hydrolytic concerns, and inconsistent molding behavior. I use a dehumidifying dryer or another drying system recommended for high-temperature engineering polymers. A typical starting condition is approximately 150°C for 3–4 hours, but the supplier’s instructions and the condition of the packaging should determine the final drying program.
I avoid leaving dried granules exposed to humid workshop air for extended periods. After drying, I transfer the material through a covered path or keep it in a properly sealed hopper. If a batch has been exposed to moisture, dust, or an uncertain environment, I do not rely on visual inspection alone; I repeat the approved drying cycle or request moisture guidance from the supplier.
The dryer should maintain a stable temperature and provide clean, dry air. I record the drying start time, temperature, material lot, and transfer time so that any surface defects can be traced to a process event. If the material remains in the hopper for a long period, I monitor whether the dryer can maintain the required condition without overheating the granules.
PEEK CF30 requires a machine designed for high-temperature processing. I select a barrel, screw, and nozzle rated for the required temperatures, and I consider wear resistance because carbon fiber can be abrasive. A general-purpose screw may work for some grades, but the screw geometry, compression ratio, and mixing design must be compatible with the compound supplier’s recommendations.
I clean the barrel thoroughly before charging the material, especially when changing from a polymer with a lower processing temperature. The nozzle should be designed to reduce drooling and freezing while maintaining stable flow. I also confirm that the mold, hot runner if used, thermocouples, and temperature controllers can operate reliably at the required mold temperature.
I use moderate screw speed and back pressure at the beginning of a trial to limit unnecessary shear and fiber damage. I set the barrel zones so that the material melts progressively rather than experiencing an abrupt temperature increase. The exact profile depends on the machine and grade, but the rear zones are normally set lower than the front zone and nozzle while remaining high enough to prevent unmelted pellets.
For the mold, I use the highest temperature that is permitted by the mold design, tooling materials, and supplier guidance. A mold temperature in the range of approximately 160–200°C is a common starting window for some PEEK grades, but the best value depends on part thickness, crystallinity requirements, surface finish, and dimensional targets.
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I begin filling with a controlled injection speed that produces a stable flow front without excessive shear heating. Carbon-fiber-filled PEEK can show strong orientation effects, so gate location, flow length, wall thickness, and injection speed all influence the final mechanical and dimensional result. I avoid changing several variables at once because that makes it difficult to identify the real cause of a defect.
After filling, I apply holding pressure long enough to compensate for volumetric shrinkage while the gate remains effective. The correct holding pressure and time are determined through part weight, sink-mark inspection, dimensional measurement, and short-shot or packing studies. Excessive packing can create flash, stress, or unnecessary cycle time, while insufficient packing can lead to voids and dimensional instability.
| Process item | Practical starting guidance | What I verify |
|---|---|---|
| Drying | About 150°C for 3–4 hours | Supplier guidance, dryer stability, and moisture-related defects |
| Melt temperature | Approximately 370–400°C | Actual melt condition, filling stability, and residence time |
| Mold temperature | Approximately 160–200°C | Crystallinity, warpage, surface finish, and demolding behavior |
| Cooling | Set by part thickness and dimensional results | Part ejection temperature, shrinkage, and cycle consistency |
The table provides a starting framework, not a guaranteed production recipe. I adjust each parameter using the grade data sheet, machine capability, mold design, and measured part performance. If the supplier provides a narrower processing window, I follow that information instead of applying a generic PEEK setting.
PEEK is a semi-crystalline polymer, so mold temperature and cooling history affect crystallinity, shrinkage, dimensional stability, and final performance. A mold that is too cold may produce a different structure and surface appearance from one processed at a higher controlled temperature. I therefore define cooling time from actual part measurements rather than using the shortest cycle that appears visually acceptable.
I inspect the part for distortion during ejection and after it reaches room temperature. Carbon fiber can reduce molded shrinkage in some directions, but orientation may create anisotropic shrinkage, meaning the part can contract differently along and across the flow direction. Gate design, balanced filling, uniform wall thickness, and controlled mold temperature are important tools for reducing this risk.
I use a documented first-article procedure that records material lot, drying history, machine settings, mold temperature, cycle time, part weight, and dimensional results. For demanding applications, I may also evaluate crystallinity, fiber distribution, voids, tensile performance, or wear behavior according to the customer’s specification. These checks help distinguish a material issue from a mold, machine, or process issue.
I do not automatically solve a defect by increasing temperature. A higher temperature can improve flow, but it may also increase residence-time risk, flash, degradation, or surface changes. I prefer a structured trial plan in which I change one major variable at a time and compare measurable results.
As a plastic raw materials supplier, I understand that purchasing PEEK CF30 granules is only one part of a successful molding project. I can help buyers clarify the intended application, required reinforcement level, processing equipment, color or formulation needs, packaging expectations, and export documentation requirements. When the exact grade is not yet selected, I recommend comparing technical data and trial requirements before making a volume commitment.
For an inquiry, I suggest sharing the part application, estimated annual volume, target properties, mold type, machine temperature capability, and any existing processing limits. I can then confirm available PEEK CF30 options, provide applicable technical information, discuss sampling, and clarify commercial details such as packaging, MOQ, lead time, and shipment planning. Final approval should always be based on your own molding trials and the agreed specification.
To process PEEK CF30 successfully, I control the complete sequence: verify the grade, dry the granules, prepare a high-temperature and wear-conscious machine, establish melt and mold temperatures, optimize filling and holding, and validate cooling and part quality. The most important starting values are approximately 150°C drying for 3–4 hours, a 370–400°C melt range, and a 160–200°C mold range, subject to the supplier’s grade-specific instructions.
Your next step should be to request the technical data sheet and sample quantity for the exact PEEK CF30 grade, then run a documented molding trial using your production mold or a representative tool. Send YONGJUXING your application and processing requirements so I can help you evaluate the material, prepare a practical trial plan, and move from granule selection to stable injection molding with clear quality targets.
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