When a rubber part shows a quality deviation, begin with the part identification, drawing requirement and observed condition. Preserve affected and unused samples, identify the quantities involved and agree how suspect material will be handled. These inputs support a useful investigation before a material or process change is proposed.
The 8D problem-solving approach provides a structure for organising the team, containing the issue, verifying causes and checking corrective action. For a purchased rubber component, the report needs to connect those activities to the actual part, lot, assembly and operating conditions.
Build an issue record the supplier can investigate
| Input | What to provide |
|---|---|
| Part identity | Part number, drawing revision, material specification, order and lot markings |
| Observed condition | Measured result or photographs, location on the part, and the requirement used for comparison |
| Extent | Quantity examined, quantity affected, locations and dates where the issue was found |
| History | Storage, cleaning, assembly and service conditions, including recent changes |
| Comparison samples | Unused parts from the same lot and available parts that performed as expected |
| Immediate need | Suspect stock locations, assembly impact and the information needed for the next decision |
Describe the observation precisely. “Leakage after assembly” and “surface damage found during incoming inspection” lead to different investigation paths. Keep a suspected cause separate from the condition that was actually measured or observed.
Use the 8D structure to make responsibilities clear
Agree the report format, responsible contacts and the updates the customer needs. The sequence below is a practical way to organise the discussion; the customer's required form and timing should be established for the project.
- Bring together the people who understand the component and its use.
- Define the problem and its affected population.
- Identify and check temporary containment.
- Investigate and verify the causes of occurrence and escape.
- Choose corrective actions and establish how to validate them.
- Implement the actions and check their effectiveness.
- Update relevant controls to reduce recurrence.
- Close the issue with an agreed record and team acknowledgement.
Connect the cause to the evidence
For a rubber seal, useful comparisons may include incoming dimensions and surface condition, material identification, assembly records and exposure history. A bonded part may also need photographs showing where separation occurred and the relevant substrate and process records.
A proposed material change should explain which requirement it addresses and what comparison will test that explanation. Changing a compound, a tool setting and an assembly method together can make the effect of each change difficult to assess. Define the comparison and retain the relevant samples and records.
Review why the issue occurred and why the applicable controls did not detect or prevent it. A replacement shipment may resolve an immediate supply need, while the investigation still requires evidence about the cause and the longer-term action.
Define what closes the issue
Agree the acceptance criteria, sample identification, test conditions and person responsible for confirming the result. Record which drawing, material or process revision applies to the evaluated parts. If the action changes an approved specification, establish the customer's approval requirements before further supply.
The closing record should state the action taken, the evidence reviewed and the follow-up needed under the agreed conditions. Separate a laboratory result, an assembly trial and observed service performance so procurement and engineering can assess each on its own basis.
Discuss a component concern with RubberQ
For an existing order or a new development enquiry, provide the part identity, requirement and available evidence. RubberQ's quality information, testing discussion and seal investigation guide can help organise the technical questions.
Contact RubberQ with the drawing, lot details and observed condition to begin the discussion.