The image above represents part shrinkage ratio.

To compute for part shrinkage ratio, two essential parameters are needed and these parameters are **mold dimension (D _{M})** and

**part dimension (D**

_{P}).The formula for calculating part shrinkage ratio:

R_{PS} = ^{DM – DP} / _{D}_{M}

Where:

R_{PS} = Part Shrinkage Ratio

D_{M} = Mold Dimension

D_{P} = Part Dimension

Let’s solve an example;

Find the part shrinkage ratio when the mold dimension is 8 and the part dimension is 10.

This implies that;

D_{M} = Mold Dimension = 8

D_{P} = Part Dimension = 10

R_{PS} = ^{DM – DP} / _{DM}

R_{PS} = ^{8 – 10} / _{8}

R_{PS} = ^{-2} / _{8}

R_{PS} = -0.25

Therefore, the **part shrinkage ratio** is **-0.25**.

Continue reading How to Calculate and Solve for Part Shrinkage Ratio | Polymer & Textile