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Shrink Rule

Shrink Rule Clay Ruler

Our Price: $18.00

Product Code: CSR



Shrink Rule – This is a ruler that you use to measure your raw clay pieces so you will know how much smaller they will be after they are fired.
An innovative way to measure the shrinkage of your clay. Works great when making replacement lids for a casserole dish that has been bisque fired. This flexible two-sided ruler has 4 clay shrinkage percentages to aid in matching lids to bowls etc.

When you make a pot and you know the approximate shinkage of the clay, this ruler will tell you how big it will be after it is fired. It include scales for low shrinkage sculpture clay to high shinkage (14%) for pocelain clay.It also has scales for 6% and 10% shinkage as found in stoneware and eathernware clay bodies.
Shrink Rule Clay Ruler


Make a rectangular clay slab as thick as you plan to make your piece and 4” X 12”, then with a regular ruler measure and carve a 10” line in the wet clay.
Bisque fire the clay slab. Measure the length of the same line again with the regular ruler.
Use the following formula to solve for S: S=(1-F/M)x100 M=length of line in original moist clay slab (with regular ruler) S=percentage of shrinkage, F= length of line in finished clay slab (with regular ruler).
Fire the clay slab to maturity and repeat steps 3 and 4 (this will allow you to determine the shrinkage of your clay after both bisque and glaze fired).

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