Investigation starting points
| Symptom | Investigate first | Useful evidence |
|---|---|---|
| Door leakage | Gap variation and latch loading | Gap map and contact marks |
| Flattened seal | Squeeze, time and temperature | Original section and recovery conditions |
| Lifting adhesive | Substrate and surface preparation | Tape reference and coating |
| Corner leakage | Joint geometry and distortion | Joint drawing and close-up |
| Filament loss | Retention and impact | End closure and loose-filament sample |
| Rapid brush wear | Deflection, alignment and speed | Installation and contact direction |
Control one change at a time
Keep a record of the original specification and proposed change. Test a representative assembly; a new material can alter fit, force and wear as well as environmental resistance.