Start a rubber-to-metal bond-failure investigation by documenting where separation occurred and preserving the affected surfaces. Record the component, material lot, insert and service history before cleaning or destructively testing the remaining samples. Visible separation helps frame the investigation; it does not establish the root cause on its own.
The useful question is how the observed damage relates to the part geometry, loading and manufacturing records. A result from a laboratory adhesion specimen also needs its method and conditions before it can be compared with another result or a failed component.
Record the location before interpreting it
Photograph the whole component and both sides of the separated region. Show orientation, loading direction and the position of the damage relative to the insert, corners and exposed edges. Include scale and identify any areas altered during removal.
| Observation to record | Information to retain |
|---|---|
| Rubber visible on an insert | Location, extent, thickness appearance and matching surface |
| Exposed insert surface | Photographs before cleaning, surface condition and any visible coating |
| Crack or tear within the rubber | Apparent starting area, direction and surrounding geometry |
| Mixed separation across the part | A location map rather than one label for the entire component |
| Damage created during removal | The extraction method and which observations may have been affected |
Agree terminology with the teams reviewing the samples. Keep a description of what is visible separate from explanations such as contamination, surface preparation, cure conditions or overload. Those explanations need supporting records and comparison evidence.
Reconstruct the service and assembly history
Collect the drawing revision, elastomer identification, insert material and surface specification. Identify installation preload, loading direction, movement, frequency or cycle history where relevant. Include temperature, contacting media, cleaning and storage conditions.
Ask whether the problem appeared at incoming inspection, during assembly, in an agreed test or after service. Compare affected and unaffected components where available. Keep samples linked to lots and production dates rather than combining observations from unidentified parts.
Compare adhesion results on the same basis
ASTM D429 covers methods for rubber adhesion to rigid substrates. Its public scope distinguishes several specimen arrangements. Name the applicable method and edition, specimen geometry, loading arrangement and conditioning when requesting or reviewing a result.
For a component test, show how the part was held and loaded. Request the force record, any normalization used and the observed separation location. Do not compare figures from different geometries or loading methods as though the number alone described bond quality.
Turn the investigation into a controlled comparison
Agree which samples and records will test each proposed explanation. Identify any changed insert preparation, material, tooling or process condition. Keep the comparison and acceptance requirement specific enough that the engineering and quality teams can evaluate the result.
Static adhesion results, repeated-load performance and assembly function are separate requirements. Where the application needs dynamic validation, define that loading and acceptance plan explicitly rather than treating a peel result as proof of component life.
Send the component evidence
Contact RubberQ with drawings, photographs, lot identification and the operating or test history. State whether the request concerns a new rubber-to-metal component, an existing quality deviation or a comparison of candidate constructions. Discuss the test and reporting requirements alongside the sample plan.