Implant-grade polyetheretherketone (PEEK) continues to gain ground in orthopedics, trauma, and spinal applications because it combines radiolucency, fatigue resistance, and a modulus closer to cortical bone than titanium or cobalt chrome. When sourcing stock shapes for CNC machining of medical devices, a virgin PEEK round bar is often the baseline reference for purity and traceability. Our natural PEEK rod for medical implant is produced from certified medical-grade resin without reprocessed content, and it is available in full-length bars or cut-to-size blanks with batch-level documentation. The same high-temperature stability that makes PEEK rod high temperature insulation suitable for demanding electrical and thermal barriers also supports repeated autoclave, EtO, and gamma sterilization cycles in clinical environments. As a focused natural PEEK rod manufacturer, we control diameter tolerance, ovality, surface finish, and residual stress to reduce scrap during Swiss turning, milling, and drilling operations. Although this stock is optimized for implant components such as interbody cages, suture anchors, trauma screws, and dental abutments, it shares dimensional discipline with PEEK rod for aerospace structural part where lot-level consistency and documentation are non-negotiable. The natural unfilled grade offers the lowest risk of additive-related biocompatibility questions and provides excellent machinability for tight-tolerance features like thread forms, snap fits, and porous coatings. This reduces rework and improves first-pass yield for high-value implant components where surface integrity and dimensional repeatability directly affect regulatory submissions.
The natural PEEK rod for medical implant is available in diameters from 6 mm to 150 mm and lengths up to 3000 mm, with tighter cut tolerances on request. Rods can be supplied in extruded or annealed condition, and custom diameters are available for volume programs. For development and pilot builds, small quantities are available from stock in common diameters, and larger diameters can be produced with a lead time of two to four weeks. Custom cut blanks, annealed rods, and machined PEEK components are also offered through the same controlled production line. The following specifications define the standard product:
Typical physical and mechanical properties are listed below for the unfilled medical-grade rod.
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 1.30–1.32 g/cm³ | ISO 1183 |
| Tensile strength at break | 95–100 MPa | ISO 527 |
| Tensile modulus | 3.6–4.0 GPa | ISO 527 |
| Flexural modulus | 4.0–4.1 GPa | ISO 178 |
| Elongation at break | 20–30% | ISO 527 |
| Compressive strength | 118–125 MPa | ISO 604 |
| Izod impact strength, notched | 6–8 kJ/m² | ISO 180 |
| Melting point | 343 °C | ISO 11357 |
| Glass transition temperature | 143 °C | ISO 11357 |
| Heat deflection temperature (1.8 MPa) | 152 °C | ISO 75 |
| Water absorption (24 h, 23 °C) | 0.1–0.2% | ISO 62 |
| Rockwell hardness | M 99 | ISO 2039-2 |
| CTE (23–150 °C) | 47–54 ppm/°C | ISO 11359 |
Each production run is verified against a documented certificate of analysis that includes melt flow index, crystallinity, color, and mechanical test results. The rod is supplied with a continuous cast or extruded structure to minimize residual stress, which improves dimensional stability during secondary machining and long-term implant performance. Mechanical values are tested on injection-molded or machined specimens depending on the lot configuration, and all properties remain within the ranges published by resin manufacturers for implantable PEEK. For implant programs, the natural unfilled PEEK rod supports imaging compatibility, low particulate generation, consistent screw retention, and long-term biostability in bone-contact environments. It also allows radio-frequency welding and bonding with compatible PEEK components without introducing metallic fillers.
