What Is Flash on a Casting

Flash or flashing is the material that is left on the casted part due to the ‘seam’ of the mould. The material enters into the seam of the mould slightly and when removed from the mould leaves a thin wafer of material attached. This is common and simple to remove with simple methods.

What is flashing in Moulding?

Molding Flash is a thin film of plastic showing at the parting line of the mold or between inserts. A thin film of plastic showing at the parting line of the mold or between mold inserts. … If the mold is older, it may be caused by tooling wear or damage.

How do you prevent flash in injection molding?

A common first response to reduce flash is to slow down the injection rate. While decreasing the injection rate eliminates flash by raising material viscosity, it also increases cycle time and still doesn’t address the original cause of flashing. Worse yet, flash may reappear during the pack/hold phase.