How is the risk priority number built?

Multiply severity, occurrence and detection. The defaults 8, 4 and 5 give 160, which is 16% of the maximum 1,000.

Which rating should I work on first?

Usually occurrence or detection, because severity is the hard ceiling. A one-point cut on the smallest rating moves the number most; cut occurrence with better consolidation or detection with more inspection.

Why is the maximum score 1,000?

Three ratings at 10 give 1,000, so every product sits between 1 and 1,000 and its share is easy to compare across a register.

Can a lower score still demand action?

Yes. A severity rating of 8 or more can justify action even at a moderate product, because the consequence is critical and the product hides it.

Composites, Fiberglass & Advanced Materials calculator

Delamination Risk Calculator

Score ply separation risk on the conventional 1 to 10 rating scales and read the product as a priority number. The share of the maximum 1,000 shows how far this mode sits up the register.

What this calculator does

Risk priority number for delamination from severity, occurrence and detection ratings on the conventional scales.

Formula used

Risk priority number = severity rating × occurrence rating × detection difficulty rating
Share of maximum score (%) = risk priority number ÷ 1,000 × 100

Inputs explained

Severity Rating: Rater guide score for the consequence of ply separation.
Occurrence Rating: Rater guide score for how often the mode appears.
Detection Difficulty Rating: Rater guide score for how hard the mode is to find.

How to use the result

Best suited to process review on a laminate part, triaging delamination findings, justifying added inspection coverage.
Multiplying ordinal ratings can reorder modes of very different severity. The number ranks modes, it does not give a failure probability.

Current U.S. benchmarks

The producer price index for plastic resins and materials stands at 280.569 (BLS, Aug 2026), up 6.6% from a year earlier. Quotes priced off last quarter's material cost miss this move.
Steel mill PPI stands at 381.162 (BLS, Aug 2026), up 23.4% from a year earlier. New factory orders are up 8.5% year over year (Census).

Common questions

How is the risk priority number built? Multiply severity, occurrence and detection. The defaults 8, 4 and 5 give 160, which is 16% of the maximum 1,000.
Which rating should I work on first? Usually occurrence or detection, because severity is the hard ceiling. A one-point cut on the smallest rating moves the number most; cut occurrence with better consolidation or detection with more inspection.
Why is the maximum score 1,000? Three ratings at 10 give 1,000, so every product sits between 1 and 1,000 and its share is easy to compare across a register.
Can a lower score still demand action? Yes. A severity rating of 8 or more can justify action even at a moderate product, because the consequence is critical and the product hides it.

Last reviewed 2026-10-01.