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Tools / Measuring & Mixing / Shrink Ruler



Shrink Ruler


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. 14% 12%, 10%, 6%.

Directions: HOW TO USE YOUR SHRINK RULER
To replace a lid for a casserole dish that has been bisque fired, measure the casserole dish with a regular ruler. Using that same measurement, measure your wet clay with the Shrink Ruler on the side with the closest shrinkage rate to your wet clay.
To replace a lid for a casserole dish that has been glaze fired, measure the casserole dish with a regular ruler. Using that same measurement measure your wet clay with the Shrink Ruler on the side with the closest shrinkage rate to yours.
Example: If you want a piece to measure 8” after 12% shrinkage, use the 12% scale on the Shrink Ruler to measure 8” on the wet clay.

How To Measure The Shrinkage Rate Of Your Clay

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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Item Product SKU Name Size Price Qty Add
CISR Shrink Rule   $23.00  Add
Tools / Measuring & Mixing / Shrink Ruler