How do you calculate a ceramic shrinkage risk score?

Multiply three 1-10 ratings: severity of the shrinkage defect, how often it occurs in recent firing history, and how poorly it is detected before shipment. With severity 7, occurrence 5, and detection 6 the score works out to about 6.05 on the configured scale.

What is a good shrinkage risk score?

Lower is better. Treat anything in the top quartile of your own defect list as a priority; scores driven by high severity (an 8-10) generally warrant action regardless of the total.

How is firing shrinkage different from drying shrinkage?

Drying shrinkage happens as pore water leaves the green body before firing, while firing shrinkage occurs during vitrification at peak temperature. This calculator scores the combined risk, but your occurrence input should reflect whichever stage is producing the defects.

Why use an RPN instead of just measuring shrinkage percent?

Measuring linear shrinkage tells you the magnitude; the RPN tells you priority. A 12% shrinkage that is always caught at inspection may be less urgent than an 8% variation that ships undetected.

What lowers the detection score?

Better dimensional gauging, fired-size SPC, and go/no-go fixtures before packing all improve detection. A high detection input (6 here) signals shrinkage that often escapes to the customer.

Can I use this for both tile and technical ceramics?

Yes. The scoring logic is identical; only your severity anchors change — a 0.2 mm tolerance part justifies higher severity ratings than a rustic floor tile.

Building Materials Manufacturing calculator

Ceramic Shrinkage Calculator

Ceramic shrinkage is the dimensional contraction a clay body undergoes as water and organics leave during drying and as the body vitrifies during firing, and uncontrolled shrinkage throws parts out of tolerance, warps tiles, and cracks sanitaryware. This calculator scores shrinkage as a risk priority number (RPN) so process engineers and quality leads in tile, brick, and technical-ceramics plants can rank it against other defect modes. By multiplying severity, occurrence, and detection, it turns a fuzzy shrinkage problem into a comparable number you can put on a Pareto chart. It is the FMEA logic ceramicists already use, applied specifically to drying and firing shrinkage.

What this calculator does

Score shrinkage risk for ceramic products based on severity, occurrence, and detection.
a ceramic plant is reviewing shrinkage risk for a body, glaze, firing schedule, or product family
It computes a shrinkage risk priority number by multiplying severity, occurrence, and detection scores for a ceramic body or part.

Formula used

Ceramic Shrinkage = severity × occurrence × detection
Use the score to rank shrinkage risk against other product or process risks

Inputs explained

Shrinkage severity for the ceramic body or part:
Shrinkage occurrence from recent firing history:
Shrinkage detection confidence before shipment:

How to use the result

Use it during process FMEAs, new-body qualification, or when triaging which kiln and forming issues to fix first.
RPN is an ordinal ranking tool, not a physical shrinkage percentage — a score of 6.05 does not mean 6.05% linear shrinkage.

Current U.S. benchmarks

U.S. housing starts run at 1,177k per year (Census, May 2026), down 8.7% from a year earlier, the demand driver for building products.
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 a ceramic shrinkage risk score? Multiply three 1-10 ratings: severity of the shrinkage defect, how often it occurs in recent firing history, and how poorly it is detected before shipment. With severity 7, occurrence 5, and detection 6 the score works out to about 6.05 on the configured scale.
What is a good shrinkage risk score? Lower is better. Treat anything in the top quartile of your own defect list as a priority; scores driven by high severity (an 8-10) generally warrant action regardless of the total.
How is firing shrinkage different from drying shrinkage? Drying shrinkage happens as pore water leaves the green body before firing, while firing shrinkage occurs during vitrification at peak temperature. This calculator scores the combined risk, but your occurrence input should reflect whichever stage is producing the defects.
Why use an RPN instead of just measuring shrinkage percent? Measuring linear shrinkage tells you the magnitude; the RPN tells you priority. A 12% shrinkage that is always caught at inspection may be less urgent than an 8% variation that ships undetected.
What lowers the detection score? Better dimensional gauging, fired-size SPC, and go/no-go fixtures before packing all improve detection. A high detection input (6 here) signals shrinkage that often escapes to the customer.

Last reviewed 2026-05-12.