PEEK Sample Probe Assemblies
PEEK and PEEK-lined sample probes for clinical diagnostics, ICP-MS trace metals analysis, ELISA autosamplers, and ultrapure water service. USP Class VI biocompatibility and zero metal contamination.
Why PEEK?
PEEK (polyetheretherketone) is the polymer of choice for sample probes when metal contamination must be zero and the operating envelope fits within PEEK's mechanical limits. The full tradeoff against 316L is in Stainless vs PEEK in Harsh Chemistry.PEEK probes dominate three application categories:
1. Clinical diagnostics — IVD, ELISA, immunoassay, blood-gas
2. Trace metals analysis — ICP-MS, ICP-OES, AA spectrometry
3. Ultrapure water (UPW) — semiconductor and pharmaceutical loops
Key Properties
| Property | Value |
| Continuous service temperature | ~250 °C (no load) |
| Max practical service under load | ~150 °C |
| Tensile strength | 100 MPa |
| Elastic modulus | 3.6 GPa |
| Density | 1.32 g/cc |
| USP Class VI | Yes |
| ISO 10993 biocompatibility | Yes |
| Chemical resistance | Excellent (except concentrated H2SO4, oleum) |
Standard Configurations
| Parameter | Range |
| OD | 1/16" - 3/8" |
| Wall thickness | 0.020" - 0.060" |
| Length | 1" - 24" |
| Tip geometry | Square, conical, side-port |
| Compliance | USP Class VI, ISO 10993, ISO 13485 |
When PEEK Is the Wrong Choice
PEEK is not the right material when:
- Process pressure exceeds 200 psig at elevated temperature
- Service temperature exceeds 150 °C under load
- Mechanical bending stress is significant (long cantilever)
- Concentrated sulfuric acid or oleum is present
For these envelopes, switch to electropolished 316L with SilcoNert 2000 coating, which preserves the metal-free wetted surface while handling the mechanical envelope.
Configure
Open the SPA Configurator, select PEEK as the wetted material, and the wizard will validate the entered pressure and temperature against PEEK's derated envelope. If the design exceeds the envelope, the wizard recommends a SilcoNert-coated 316L alternative.