Rubber Mold Engineering

📏Shrinkage & Mold Cavity Size

Mold cavity = part dimension × (1 + shrinkage). Rubber shrinks after demolding and cooling, so the cavity must be larger than the finished part.

%
mm
Compensate mold-steel thermal expansion
the cavity is filled at mold temperature, where the steel has expanded; after correction the room-temperature cavity is the machining target.
×10⁻⁶ /°C
°C

✓ Result

Shrinkage depends on compound hardness, wall thickness, mold temperature and curing…