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PEEK fitting pressure can fall below a catalog value when the field assembly does not reproduce the conditions used for the published test. A recent customer case reported that a WK11A-10-32-K one-piece finger-tight connector released at about 15 MPa even though the customer expected roughly 25 MPa. The sales-experience record did not treat that observation as proof of a defective connector. It first directed attention to tightening force, use of the matching installation handle, and verification with a torque detector.
The product catalog supplies the context needed to investigate the difference. It lists the WK11A-10-32-K for 1.6 mm outside-diameter semi-rigid tubing with a recommended torque of 0.45 N.m and a pressure value of 25.20 MPa. The catalog also explains that its pressure value is a safe pressure derived from a specific test method, and that actual results can change with the receiving port, tubing material and diameter, temperature, and solvent. The correct engineering response is therefore to recreate the catalog assembly as closely as possible, document deviations, and change one variable at a time.
If a WK11A-10-32-K connection releases near 15 MPa, do not assume that the 25.20 MPa catalog value applies to the field setup without qualification. Confirm that the connector is used with 1.6 mm OD semi-rigid tubing, the tube reaches the bottom of the receiving port, the thread and port geometry match, and the connector is tightened to the catalog value of 0.45 N.m using the appropriate tool. Then repeat the pressure test under controlled conditions. The catalog data were generated with 1.0 x 1.6 mm PEEK capillary tubing and, unless otherwise stated, with water at 25 degrees C. Record the actual tubing, port, liquid, temperature, pressure ramp, hold time, and failure location before comparing the two results.
The connection catalog does not describe the listed number as an unconditional burst guarantee for every assembly. It defines the published pressure value as a safe pressure equal to 70 percent of the critical pressure at which a tube or connector begins to leak in the pressure test. The catalog test places the sample in a water-filled tank, increases gas pressure step by step until leakage is observed, records that value, reduces it to 70 percent, and performs a pressure-hold observation.
That definition matters because a field event described as the connector popping open may not be identical to the catalog leakage endpoint. The customer report says the connection opened at around 15 MPa, while the catalog method records the point at which leakage begins and then derives a lower safe value. Before comparing numbers, classify the actual failure: leakage at the port, tubing pullout, thread disengagement, connector damage, tube damage, or another visible mechanism. The source documents do not provide a universal conversion between those failure modes. Data not available in source documents.
The catalog also states that tests are performed with water at room temperature of 25 degrees C unless another condition is specified. It warns that the receiving port and tubing material, actual tubing diameter within tolerance, temperature, and solvent can change results. These are not minor footnotes. They define the boundary of the published evidence.
A useful PEEK fitting pressure investigation separates the connector specification from the complete assembled joint. For the WK11A-10-32-K, the catalog identifies a one-piece PEEK finger-tight connector with a 10-32UNF conical interface for 1.6 mm OD PEEK, PTFE, ETFE, FEP, and other semi-rigid tubing. The same page lists 0.45 N.m torque, 10.52 kgf pullout force, 25.20 MPa pressure, and 0.72 tube-port deformation for the first WK11A row. The test note states that the pressure-related data use 1.0 x 1.6 mm PEEK capillary tubing.
Use those values as a matched test configuration, not as independent promises. Changing the tube material, tube dimensions, receiving port, liquid, or assembly method creates a different joint. The catalog illustration also warns that a tube that does not reach the bottom of the receiving port introduces dead volume. In a pressure investigation, incomplete insertion is therefore both an assembly deviation and a possible indicator that the sealing geometry was not engaged as intended.
Check | Catalog or case evidence | Field verification |
Connector | WK11A-10-32-K one-piece PEEK finger-tight fitting | Record the exact part marking and inspect for damage |
Interface | 10-32UNF conical port | Confirm the receiving port standard and condition |
Tubing | 1.6 mm OD semi-rigid tube; catalog test used 1.0 x 1.6 mm PEEK capillary | Record material, ID, OD, cut quality, and insertion depth |
Torque | Recommended value 0.45 N.m | Use the matching handle and a calibrated torque detector |
Pressure basis | 25.20 MPa for WK11A; catalog safe value derived from the leakage threshold | Match medium and temperature or document the deviation |
Customer observation | Connection reported to open at about 15 MPa | Capture failure location, ramp, hold time, and repeatability |
1. Identify every component. Record the connector model, receiving port type, tubing material, tubing ID and OD, and whether any adapter is installed between the connector and the pressure source.
2. Inspect the tube end and insertion. Use a clean square cut, confirm that the outside diameter is suitable for the fitting, and verify that the tube reaches the bottom of the port as shown in the catalog installation guidance.
3. Inspect the port and connector. Look for visible thread damage, contamination, deformation, or previous over-tightening. The source documents do not define numerical rejection limits for these observations. Data not available in source documents.
4. Control assembly torque. Tighten to the catalog recommendation of 0.45 N.m with the matching installation handle and a torque detector that can be preset. Do not substitute an operator's hand feel for a controlled setting when pressure performance is being qualified.
5. Reproduce the reference medium and temperature where practical. The catalog basis is water at 25 degrees C unless otherwise specified. If the application uses another liquid or temperature, treat the result as application-specific evidence.
6. Define the pressure procedure before testing. Record the pressure ramp, each dwell, the maximum pressure, the hold time, and the observation method. The source documents do not give one universal ramp rate or hold duration for customer validation. Data not available in source documents.
7. Classify the first failure. Photograph the joint and note whether the first sign is leakage, tube movement, thread movement, connector damage, or another mechanism.
8. Repeat with one variable changed. Replacing several parts and changing torque at the same time prevents a clear conclusion. Keep a short assembly and test record for each run.
The sales-experience record links the customer's lower result to uncontrolled manual tightening as the first hypothesis to test. It recommends the matching finger-tight installation fixture and torque detector so the connector can be assembled to a defined torque. The catalog supports that recommendation by listing 0.45 N.m and by describing a detector that can be preset to prevent excessive tightening.
Both insufficient and excessive tightening must be avoided during a controlled test. The documents specifically identify insufficient hand tightening as a possible reason for not reaching the expected pressure, while the tooling note says preset torque prevents over-tightening. This is why the procedure should target the stated torque rather than simply applying more force after a failure.
A valid comparison states both configurations side by side. For the catalog reference, record WK11A-10-32-K, 10-32UNF conical interface, 1.0 x 1.6 mm PEEK capillary, 0.45 N.m torque, water, and 25 degrees C, together with the catalog definition of safe pressure. For the field configuration, record the same fields plus pressure procedure and failure mode. If any item is unknown, label it unknown rather than assuming it matches.
If the controlled assembly approaches the catalog result while the original hand-tightened assembly does not, the evidence supports an assembly-process difference. If both controlled and original assemblies fail at a similar lower pressure, escalate with the complete test record. The sales guidance specifically advises against giving an immediate unsupported answer and recommends clarifying the real application before proposing a solution or alternate product.
· Exact connector and receiving-port part numbers
· Tube material plus measured ID and OD
· Assembly torque and tool identification
· Fluid, temperature, and test pressure source
· Pressure ramp, dwell sequence, and hold time
· Failure mode, failure pressure, and repeat count
· Photos before assembly and immediately after failure
· Whether a tool-controlled assembly shows the same behavior
This record gives technical support enough information to separate a product issue from a configuration or test-method mismatch. It also prevents the catalog pressure value from being repeated without the conditions that make it meaningful.
The catalog value comes from a defined assembly and test method. The receiving port, tubing material and diameter, temperature, solvent, insertion, and tightening torque can change the result. A field event also needs to be classified as leakage, tube pullout, thread movement, or another failure before it is compared with the catalog endpoint.
The RUNZE connection catalog lists 0.45 N.m for WK11A-10-32-K used with 1.6 mm OD tubing. Use a matching installation handle and a torque detector rather than relying only on hand feel during qualification.
The catalog table lists 25.20 MPa for the WK11A-10-32-K row. The same catalog defines listed pressure as a safe pressure derived from the leakage threshold and describes water testing at 25 degrees C unless otherwise stated.
No universal application to every fluid is stated. The catalog says solvent, temperature, tubing, and receiving-port conditions can change the result. Chemical compatibility and pressure performance should therefore be qualified with the actual application conditions.
The documents do not recommend uncontrolled extra force. They provide a recommended torque and tooling intended to prevent both insufficient assembly and excessive tightening. Use the stated setting and document the tool.
The note on the relevant catalog page states that the pressure-related data use 1.0 x 1.6 mm PEEK capillary tubing. The fitting is described for 1.6 mm OD semi-rigid tubing, including PEEK, PTFE, ETFE, and FEP.
Stop increasing pressure, preserve the failed assembly, and send the full configuration and test record to technical support. A universal alternate part or pass-fail rule is not provided in the source documents. Data not available in source documents.
PEEK fitting pressure should be evaluated as a property of the complete assembled connection and test method. For WK11A-10-32-K, the evidence supports a controlled check of the 10-32UNF port, 1.6 mm OD tubing, full insertion, 0.45 N.m torque, test medium, temperature, and observed failure mode. The catalog's 25.20 MPa value is useful only with its stated basis and limitations. Reproducing those conditions, documenting deviations, and escalating with repeatable evidence is the safest way to resolve a field result near 15 MPa without inventing a specification or making an unsupported guarantee.
