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A parting line in moldmaking is the place where two or more parts of the mold meet.[1] Parting lines occur due to minute inherent gaps between two mating faces of halves of the die. The material filling into these gaps is generally called molding flash or simply flashing. Parting lines generally show up as a raised line around the product (witness mark) on commodity products such as toys.

Many applications (seals, tight running molded parts) that require precision for shape control, call for removal of flashes. Secondary operations are thus employed, in addition to high precision molding dies to remove these flashes. Many molders will repair or even replace the mold tooling so that the flash is reduced to an acceptable tolerance or eliminated altogether. Secondary operations to remove parting line flash include hand trimming, vibratory tumbling, media blasting and cryogenic deflashing.[2]

Flashes are known to improve sealing between mating faces in some instances (Fuel tank seals, hydraulic power steering gear, etc.), and thus flashes are permitted to some extent in special cases.

In engineering drawing, parting line is often abbrivated as PL. ASME's Y14.8 standard specifies a symbol for parting line.[3]


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316 news items


Sun, 24 Aug 2014 22:31:12 -0700

First of all, the location of the parting line determines the direction of mold opening and, consequently, the direction in which features must be drafted for easy ejection. Second, it affects where any vestiges left by the mating surfaces of the mold ...
London Free Press
Fri, 14 Nov 2014 13:45:00 -0800

His parting line has stayed with me all these years and put the whole episode in perspective, giving my ego a devastating blow. Yet it was all too bizarre and funny to do anything but benignly smile. His closing question, “Well, I'm sorry you feel that ...

Wall Street Journal (blog)

Wall Street Journal (blog)
Tue, 11 Nov 2014 14:53:13 -0800

Will you clear up, in the next season, Tom's parting line “I was locked up for 4 months and never once told her about us.” That is definitely a story we are going to explore. Will we see more of Paul Reubens's character? I love Paul. Paul loves the show.
Today's Zaman
Wed, 17 Sep 2014 09:18:45 -0700

A parting line was running through the Muslim majority. As for the goal of secular Young Turk revolutionaries, it consisted of destroying the ancient regime, and those who were not fitting in the definition of “new” were doomed to destruction, exactly ...


Tue, 23 Sep 2014 10:19:38 -0700

He got a redemption arc last season that did not hinge whatsoever on Abbie reciprocating his feelings, which was great, and even makes his parting line seem less like creeping than like an apology. (And really, "You remind me that I am human" is a ...

Consequence of Sound

Consequence of Sound
Thu, 11 Sep 2014 21:01:01 -0700

And how you respond to Goodwin's parting line depends on whether or not you see him as the hero. It's easy to accept him as such: he's young, handsome, and presented as a morally sound individual with big dreams. I, however, do not see Dick Goodwin as ...


Mon, 29 Sep 2014 07:34:41 -0700

Since this is for a two-part mold, you will need to consider where the parting line is, with this one having a center line between the front and the back. Once that's done, you'll need to either use your 3D printer to print out the original, or arrange ...
The Republican - masslive.com
Wed, 08 Oct 2014 12:26:23 -0700

Not in the real world known as the private sector. But, of course, they would no be able to do that. In this economy pay raises are almost unheard of. They need a reality check or psychiatric help. I agree with POORboy14's parting line times 25,000 ...

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