Drying shrinkage vs firing shrinkage

Drying shrinkage runs from wet to dry; firing shrinkage runs from dry to fired. The percentages use different starting values, so simply adding them overstates the total.

Procedure

1. Drying shrinkage runs from wet to dry; firing shrinkage runs from dry to fired. The percentages use different starting values, so simply adding them overstates the total.
2. For final-size planning apply the two multipliers in sequence. The tool shows dry and fired dimensions so the stage of a discrepancy is visible.
3. Results depend on batch, preparation, particle alignment, thickness and actual heatwork.

What to record in CeramikaTo

• Work or sample code and date.
• Material, batch, cone, schedule and position.
• Observation separated from hypothesis.

Common mistakes

• Changing several variables at once without a control sample.
• Missing batch, cone or kiln-position information.
• Treating an estimate as a guarantee.