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Flash (manufacturing)

Flash, center, on a molded plastic laundry basket. Plastic has filled an area that should be an empty space, probably by seeping through a gap where the molds were not clamped sufficiently close together.

Flash, also known as flashing, is excess material attached to a molded, forged, or cast product, which must usually be removed. This is typically caused by leakage of the material between the two surfaces of a mold (beginning along the parting line[1]) or between the base material and the mold in the case of overmolding.

  1. ^ David Kazmer (2007). Injection mold design engineering. Hanser Verlag. p. 70. ISBN 978-1-56990-417-6. Retrieved 15 April 2011.
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