How do you calculate raw material shelf life risk?

Multiply the three scores: shelf-life failure impact severity, expiry or degradation likelihood, and pre-use detection difficulty. In the worked example, 8 x 5 x 4 produces a risk priority value, with the headline normalized score shown as 5.95 for ranking against other materials.

What is a good or acceptable shelf life risk score?

Lower is better. There is no universal threshold, but teams typically set an internal action line, for example flagging anything in the top quartile of their scored inventory for tighter retest or rotation. A severity of 8 like the example almost always warrants a control even if likelihood is moderate.

Why multiply the three scores instead of adding them?

Multiplication makes a material dangerous only when all three factors are non-trivial. A catalyst that is catastrophic if degraded (high severity) but is easily caught by an incoming viscosity check (low detection difficulty) is correctly pulled down, which addition would not do.

What does pre-use detection difficulty mean for raw materials?

It scores how hard it is to notice degradation before the material enters a batch. A pigment that visibly separates is easy to catch (low score); a hardener whose NCO content has quietly drifted with no field test is hard to catch (high score, like the 4 in the example).

How is this different from a general FMEA risk priority number?

It uses the same severity-occurrence-detection logic as an FMEA RPN, but it is scoped specifically to time-and-storage-driven raw material degradation rather than process or equipment failure modes, so the questions behind each score are about shelf life, expiry and incoming inspection.

How should I act on a high shelf-life risk score?

Attack the factor you can move. You usually cannot lower severity, but you can cut likelihood with better climate control and FEFO rotation, and cut detection difficulty by adding an incoming or pre-use test, which mechanically lowers the score.

Coatings, Inks & Specialty Chemical Production calculator

Raw Material Shelf Life Risk Calculator

Raw Material Shelf Life Risk is an FMEA-style score that ranks how dangerous a degrading or expired raw material is to a coatings, ink or specialty chemical operation. Quality engineers, warehouse managers and formulators use it to decide which resins, hardeners, pigments, catalysts and solvents need tighter rotation, retest dates or supplier controls. It matters because many specialty inputs change quietly with time, temperature and exposure, and a settled pigment or a hydrolyzed isocyanate that reaches the mixer can scrap a whole batch. Scoring severity, likelihood and detection together stops you from treating every drum the same and focuses attention where degradation will actually hurt.

What this calculator does

Score raw material shelf-life risk from impact severity, likelihood of expiry or degradation, and detectability before use.
prioritizing raw materials that need rotation, retest, disposal, or purchasing controls
It computes a single risk score by multiplying the severity of a shelf-life failure, the likelihood the material degrades or expires, and how hard that degradation is to catch before use.

Formula used

Raw Material Shelf Life Risk = shelf-life impact severity × expiry or degradation likelihood × pre-use detection difficulty
Use the same scoring scale across comparable raw materials and storage conditions.

Inputs explained

Shelf-life failure impact severity:
Expiry or degradation likelihood:
Pre-use detection difficulty:

How to use the result

Use it when ranking raw materials for retest frequency, FEFO rotation rules, storage upgrades or supplier shelf-life agreements across a chemical or coatings store.
The score is only meaningful when every material is rated on the same scale and storage condition; a high number flags relative priority, not an absolute probability or a guaranteed failure.

Current U.S. benchmarks

Industrial electricity averages 8.66 cents per kWh across the U.S. (EIA, Apr 2026), up 5.5% from a year earlier. Energy-intensive steps carry this directly into unit cost.
The producer price index for industrial chemicals stands at 344.336 (BLS, May 2026), up 16.1% from a year earlier. Quotes priced off last quarter's material cost miss this move.
The U.S. has 14,543 chemical manufacturing establishments employing about 911,245 workers (Census County Business Patterns, 2023).

Common questions

How do you calculate raw material shelf life risk? Multiply the three scores: shelf-life failure impact severity, expiry or degradation likelihood, and pre-use detection difficulty. In the worked example, 8 x 5 x 4 produces a risk priority value, with the headline normalized score shown as 5.95 for ranking against other materials.
What is a good or acceptable shelf life risk score? Lower is better. There is no universal threshold, but teams typically set an internal action line, for example flagging anything in the top quartile of their scored inventory for tighter retest or rotation. A severity of 8 like the example almost always warrants a control even if likelihood is moderate.
Why multiply the three scores instead of adding them? Multiplication makes a material dangerous only when all three factors are non-trivial. A catalyst that is catastrophic if degraded (high severity) but is easily caught by an incoming viscosity check (low detection difficulty) is correctly pulled down, which addition would not do.
What does pre-use detection difficulty mean for raw materials? It scores how hard it is to notice degradation before the material enters a batch. A pigment that visibly separates is easy to catch (low score); a hardener whose NCO content has quietly drifted with no field test is hard to catch (high score, like the 4 in the example).
How is this different from a general FMEA risk priority number? It uses the same severity-occurrence-detection logic as an FMEA RPN, but it is scoped specifically to time-and-storage-driven raw material degradation rather than process or equipment failure modes, so the questions behind each score are about shelf life, expiry and incoming inspection.

Last reviewed 2026-05-12.