Unfilled PEEK provides heat resistance, chemical resistance and mechanical performance without added reinforcement. The stock specification still needs an exact grade.[1]
Glass reinforcement can improve stiffness and resistance to creep. It can also wear a mating surface, so a structural support and a sliding bearing should not receive the same material decision. [2]
Carbon-fiber reinforcement changes stiffness, thermal behavior and electrical properties. Carry the exact formulation into the drawing review; it is not interchangeable with unfilled PEEK. [3]
Wear-modified formulations are developed for sliding applications. A blend containing PTFE, graphite and carbon fiber is different from a grade reinforced only for stiffness. [4]
Specify the stock manufacturer, grade and formulation. The quotation confirms the material source, availability and suitability for the stated application.
| Property | Unfilled PEEK TECAPEEK natural | 30% Glass-Filled PEEK TECAPEEK GF30 natural | 30% Carbon-Filled PEEK TECAPEEK CF30 black | Test condition |
|---|---|---|---|---|
| Density (g/cm³) | 1.31 | 1.53 | 1.38 | — |
| Tensile modulus (MPa) | 4,200 | 6,300 | 6,000 | 1 mm/min |
| Tensile strength (MPa) | 116 (50 mm/min) | 113 (5 mm/min) | 112 (50 mm/min) | Test speed shown with each value |
| Hardness (Shore D) | 89 | 90 | 90 | Shore D |
| Thermal expansion (×10⁻⁵/K) | 5 | 4 | 4 | 23–60°C, longitudinal |
| Thermal conductivity (W/(m·K)) | 0.27 | 0.35 | 0.66 | ISO 22007-4:2008 |
| Water absorption (%) | 0.02 / 0.03 | 0.02 / 0.03 | 0.02 / 0.03 | 24 h / 96 h at 23°C |
Typical properties of the named stock grades; fiber reinforcement changes stiffness, heat transfer and expansion.
Define the bore, outside diameter and mating shaft together. For sliding duty, include the load, speed, lubrication and acceptable wear, not only the room-temperature fit.
Locating holes, supported faces and load direction define guides and support blocks. Rubbing contact adds wear considerations beyond positioning alone.
Identify the electrical requirement, contact points and mechanical loading. Do not substitute a reinforced or wear-modified grade without reviewing its electrical properties.
Specify port locations, thread forms, sealing faces and the fluid involved. Define any leak test and its acceptance conditions before treating the component as ready for service.
Show how the fixture is supported and which surfaces locate the mating part. Include thermal cycles and any limits on contact marks, burrs or cleaning residues.
Call out thin walls, pocket floors and fastener locations. Share the mating component or assembly drawing where stiffness and alignment are part of the requirement.
| Requirement | Operating data | Grade selection | Acceptance basis |
|---|---|---|---|
| Heat and thermal cycling | Temperature range; duration; cycles; applied load | Grade-specific thermal and mechanical properties [1] | Assembled fit and load requirements |
| Sliding and wear | Pressure; speed; lubricant; mating material; finish | Wear formulation matched to contact conditions [2] [4] | Contact performance, not glass content alone |
| Electrical insulation | Resistance/dielectric target; geometry; environment | Filler-specific electrical properties [3] | Specified test for the selected grade |
| Chemicals and cleaning | Fluid; concentration; temperature; cleaning cycles | Compatibility of the exact formulation | Complete service and cleaning exposure |
| Controlled applications | Approved grade; stock source; cleanliness | Approval for the specified application | Required documents verified before stock purchase |
Pocket depths, internal corners and positional requirements define milled features. Workpiece support and faces that must remain undisturbed affect the setup plan.
For a turned part, identify the dimensions that function together: a bore and shaft, a shoulder and stop face, or a groove and mating seal. Include the assembly temperature and whether the fit is assessed before or after installation.
Filled and unfilled PEEK require different cutting considerations. Heat, tool condition and workpiece support affect edge quality and dimensional stability. [5]
Residual stresses can redistribute when material is removed. Ask whether the supplied rod, plate or tube has been stress relieved, and whether the proposed geometry needs an intermediate stabilization step. [6]
Where stress relief is needed, agree the process sequence and final inspection condition using the formulation, section thickness and supplier guidance. [6]
| Feature | Specification | Acceptance condition | Verification |
|---|---|---|---|
| Bores and outside diameters | Size limits; mating part; clearance/interference | Specified temperature; free-state or assembled | Defined dimensional and fit measurement |
| Flatness and parallel faces | Datums; wall section; permitted clamping | Defined support; no forced reshaping | Surface measurements; recorded support arrangement |
| Threads and fastener holes | Thread designation; engagement; inserts | Specified assembly loading | Separate thread, assembly and position checks |
| Sealing and sliding surfaces | Finish; measurement locations; edges; mating surface | Recorded faces identified | Surface checks; sample trial where specified |
| Position and multi-face geometry | Datums; feature relationships; drawing revision | Released drawing | Functional relationships and individual dimensions |
PEEK tolerance review covers feature dimensions, geometry, formulation and service conditions. The quotation defines the agreed limits and inspection scope.
Identify the surfaces that can be held during machining. On slender or uneven sections, discuss the order of material removal and whether a prototype is needed before the design is released for a batch.
For press fits, threaded connections and seals, share the mating material and assembly method. The drawing should show where the part is allowed to move and where alignment or contact must be maintained.
Use the drawing to identify acceptable tool marks and surfaces that need a specific finish. Appearance should be reviewed separately from functional roughness.
Name the edges that need a break and the passages that must be clear of burrs. Do not round a sealing edge or locating feature without agreement.
Identify the face, target finish and measurement direction. Agree any additional finishing operation on the exact formulation and geometry.
Specify permitted cleaning agents, cleanliness expectations and marking locations. Any additional coating or treatment needs its own compatibility and acceptance review.
Request the supplier designation, filler content, stock form and lot identification needed for your order. Any proposed substitution should be raised for approval before material is purchased or cut.
List the dimensions that need recorded results, the datum arrangement and the inspection condition. Where a report is required, agree its format and sampling scope rather than assuming every order uses the same document.
For a first order, discuss a sample review that includes the part, the requested records and any agreed assembly checks. Name any special test or declaration you need and we quote it explicitly.
Quote the specified formulation and the blank size required by the geometry. A change to the supplier, filler package or stock form needs review; it should not be made just to reach a lower price.
Deep pockets, multiple orientations, thin sections and stock left for finishing all affect the machining route. Share both sample and repeat quantities so setup work can be considered in the right context.
Include the surfaces needing extra finishing, recorded dimensions, cleanliness expectations and any sample approval. A comparable quotation needs the same grade, scope and evidence on each supplier’s offer.
Send matching CAD and drawing files, the PEEK specification and quantities. Identify requirements that are still open for engineering discussion.
Agree the production source, machining route, inspection plan and any stabilization or finishing work before the sample is made.
Check the sample against the agreed criteria. Record approved changes in the controlled drawing instead of relying only on email comments.
For a reorder, confirm the revision, material source, quantity and records. Bring any proposed process or supply change back for approval.
Share the model together with a dimensioned drawing, exact PEEK specification and quantities. The model describes the shape; the drawing needs to identify the dimensions, surfaces and records used to accept the part.
Begin with the application requirements and any approved material list. Unfilled, glass-filled, carbon-filled and wear-modified PEEK are different formulation families. We can discuss the machining implications, but the final material selection needs approval for your design and service conditions.
Not automatically. Glass reinforcement can help stiffness, while exposed fibers can increase wear of the mating surface. Provide the shaft material, contact load, speed and lubrication before selecting a bearing formulation. [2]
Carbon-filled and unfilled PEEK can have different electrical behavior. Check the specified grade’s data and test conditions against the insulation or resistance requirement. Any proposed substitution needs approval. [3]
Send the actual feature sizes, wall sections, datum system and formulation. A tolerance needs to be reviewed together with the process, inspection temperature and support condition. The quotation should confirm which dimensions and reports are included.
No. Stock history, the amount of material removed, geometry and dimensional stability requirements guide that decision. Where annealing or another stabilization step is needed, agree its position in the process and how final dimensions are accepted. [6]
A supplier’s test result or service-temperature guide does not by itself establish the allowable load, life or fit of your component. Provide the continuous and intermittent temperatures, duration, cycling and mechanical load for application review. [1]
Include the sample quantity and expected batch quantity in the inquiry. Agree the sample’s material, inspection scope and approval criteria so any design or process changes can be recorded before the production revision is released.
Specify which records you need with the RFQ. Material identification, lot traceability, dimensions and special tests are separate requirements; their availability, scope and format should be confirmed in the quotation.
Use the approved material and evidence requirements for your project. Name the exact grade, stock source, end use and required declarations. Medical, food-contact and other application approvals follow the named grade and the declarations you require.
Keep the approved drawing revision, material specification, finish and acceptance records together. On a repeat order, confirm the current quantities and whether any material-source or process changes need your approval.
Yes. We can discuss direct production, coordination with a suitable partner or a direct introduction. The production source, responsibility for inspection, commercial arrangement and permitted sharing of your files should be clear before the project proceeds.
Agree confidentiality and the transfer method before sharing sensitive or restricted files.
Share your drawing, material and quantity. Tell us what you need and we will reply by email.
Manufacturer references for PEEK properties and machining. Use the current documentation for the exact stock grade and application.
Unfilled PEEK: grade-specific properties and thermal data.
Glass reinforcement, stiffness and mating-surface considerations.
Carbon reinforcement and grade-specific mechanical, thermal and electrical data.
An example of a wear-modified formulation; not a universal definition of every bearing-grade PEEK.
Tooling, thermal control, support and material-specific machining considerations.
Stress redistribution and case-specific stabilization planning.
Additional manufacturer background on unfilled, reinforced and bearing formulations.
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