This Process FMEA evaluates 3 failure modes for injection molding; the highest RPN is 252 (short shot), computed as Severity × Occurrence × Detection.
RPN = Severity (S) × Occurrence (O) × Detection (D), each rated 1–10.
| Failure Mode | S | O | D | RPN | Risk |
|---|---|---|---|---|---|
| short shot | 9 | 4 | 7 | 252 | high |
| warpage | 7 | 5 | 6 | 210 | high |
| sink marks | 4 | 6 | 5 | 120 | high |
Focus corrective actions on the highest RPN first — typically RPN above 100 is treated as high risk.
RPN = Severity × Occurrence × Detection. Example: short shot 9×4×7 = 252.
RPN above ~100 is generally considered high risk; address the highest RPNs first with corrective actions.