A parting line in moldmaking is the place where two or more parts of the mold meet^[1]. At times, either because the mold halves do not meet with enough precision or because injection pressure is high, material will creep into the space between the molds. This material is generally called molding flash or simply flashing. At times the parting line can be seen on cheaper toys and other items as a raised line around the product.

Parting lines are commonly removed on Iron, Bronze and Aluminium by cutting, breaking or grinding. These processes are time consuming and dangerous. More and more foundries are using robot autogrinders to remove this unwanted material.

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