How do you calculate prepreg out time risk?

Multiply the three FMEA ratings: severity x occurrence x detection. With severity 8, occurrence 3 and detection 5, the raw product is 120, scaled to the calculator's 5.5 risk score.

What is a high out-time risk score?

On a 1-10 per-factor scale, raw products above ~100 are typically high priority. A severity of 8 alone — meaning a degraded part could ship — flags this mode for action regardless of the total.

What does the detection rating mean for prepreg out-time?

It rates how hard the problem is to catch before it reaches a part. A 5 means out-time overrun is only moderately detectable — log-based tracking helps but visual tack loss is unreliable. Higher scores mean worse detectability.

Why is severity the rating to watch?

Out-time defects often cause poor consolidation or undercure that survives inspection and fails in service. That high severity (8) is why this mode deserves attention even though occurrence is only 3.

How do I lower the out-time risk score?

Attack the most reducible factor. You rarely lower severity, but barcode out-time tracking and freezer logs cut occurrence and improve detection — moving detection from 5 toward 2 meaningfully drops the score.

Is RPN enough to manage prepreg out-time?

No. Use it to prioritize, but pair it with a strict out-time accumulation log per roll. The score tells you how urgent controls are; the log is the control.

Composites, Fiberglass & Advanced Materials calculator

Prepreg Out Time Risk Calculator

Prepreg Out Time Risk scores how dangerous it is when prepreg sits out of the freezer too long, using the FMEA logic of severity times occurrence times detection. Composites quality and process engineers use it to rank out-time exposure against other process risks and to decide where to add controls. It matters because prepreg has a finite out-time budget — once tack and flow degrade, the resin will not consolidate or cure correctly, and the damage is often invisible until a part fails. A single risk number lets a team compare a hard-to-detect, high-severity out-time mode against more obvious problems and prioritize honestly.

What this calculator does

Estimate risk priority from prepreg out-time exposure during thaw, cutting, kitting, or layup.
prioritizing controls for prepreg out-time exposure
It multiplies the severity, occurrence and detection ratings for prepreg out-time into a single FMEA-style risk priority score.

Formula used

Prepreg Out Time Risk = out-time severity score × out-time occurrence score × out-time detection difficulty score

Inputs explained

Out-time defect severity rating:
Out-time exposure occurrence rating:
Out-time detection difficulty rating:

How to use the result

Use it during PFMEA, control-plan reviews, or any time you are deciding whether out-time tracking needs tighter controls.
Like all RPN scoring it can mask a high-severity, low-occurrence mode behind a moderate total, so always check severity on its own, not just the product.

Current U.S. benchmarks

The producer price index for plastic resins and materials stands at 319.371 (BLS, May 2026), up 19.5% from a year earlier. Quotes priced off last quarter's material cost miss this move.
Steel mill PPI stands at 348.53 (BLS, May 2026), up 6.7% from a year earlier. New factory orders are up 2.3% year over year (Census).

Common questions

How do you calculate prepreg out time risk? Multiply the three FMEA ratings: severity x occurrence x detection. With severity 8, occurrence 3 and detection 5, the raw product is 120, scaled to the calculator's 5.5 risk score.
What is a high out-time risk score? On a 1-10 per-factor scale, raw products above ~100 are typically high priority. A severity of 8 alone — meaning a degraded part could ship — flags this mode for action regardless of the total.
What does the detection rating mean for prepreg out-time? It rates how hard the problem is to catch before it reaches a part. A 5 means out-time overrun is only moderately detectable — log-based tracking helps but visual tack loss is unreliable. Higher scores mean worse detectability.
Why is severity the rating to watch? Out-time defects often cause poor consolidation or undercure that survives inspection and fails in service. That high severity (8) is why this mode deserves attention even though occurrence is only 3.
How do I lower the out-time risk score? Attack the most reducible factor. You rarely lower severity, but barcode out-time tracking and freezer logs cut occurrence and improve detection — moving detection from 5 toward 2 meaningfully drops the score.

Last reviewed 2026-05-12.