Today's KNOWLEDGE Share : Understanding Shrinkage in Injection Molding

 Today's KNOWLEDGE Share

🔹 Understanding Shrinkage in Injection Molding — It’s Not Just About the Mold

Shrinkage is one of the most overlooked—but most important—factors in plastic part design.

Why? Because every plastic shrinks as it cools. If not accounted for early, it can lead to:

✅ Warping

✅ Out-of-spec dimensions

✅ Assembly issues

Shrinkage depends on:

🔬 Material type – ABS vs. PA vs. PP = different shrink rates

🌡️ Molding conditions – like cooling rate and pressure

🧩 Part geometry – thicker walls tend to shrink more

📏 A 2% shrinkage may sound small—but on a 100 mm part, that’s 2 mm out of spec.

SCSplastic, we always simulate and calculate shrinkage before tooling starts. That’s how you get precision parts right the first time.

🛠️ Good shrinkage planning = less rework, better fit, and fewer surprises.

source : SCSplastic