Definition of the Flash Size in the Plastic Part Drawing

Do you mean "flash" (excess material that is formed with and attached to the component along a seam or mould parting line)?

Yes ,sorry, I meant flash -material residues.

Hello and welcome to this forum.

I suspect that there is a small error in translation here.

For injection moulding there is a characteristic known as "flash" (not flesh) that is the result of material squeezing between the closed surfaces of the moulding tool.

Thus the flash will usually appear as a localised increase in diameter at that end of the component where the tool parting line is.

The effect will also show in thepart total length as it will represent that amount that the two halves of thetool have not been able to close.

This means that length could be up to the flash size above nominal toleranced size, but dameter could locally be up to 2 x flash size increase in diameter (will happen both sides) and it could also be evident on the inside if thepart is a tube and thedie doesn't have proper blank-off.

So , in my case the total length including flash could be 10.15 mm ,isn't it?
(taking into account that the flash is 0.05 and cylinder is up to 10.1mm)
And in case of diameter 5±0.1mm , i can accept the part 5.2 mm (0.05 mm flash on each side ) ?

It seems that you might have the cart before the horse.

You (or the customer/designer) need to understand what is the acceptable component size and whether the capability of this supplier can satisfy those needs. I cannot tell you what is acceptable for your expectations.

If the flash allowance they are suggesting in unacceptable, then some means needs to be developed to overcome that. (Either an alternate supplier, some rework process, or better process control.)

Also note that a 0.5 flash on diameter might only be 0.01mm thick.

You need to work with your supplier to develop a process that supplies what you need.

Remove all flash before inspection. It is a defect.

The width of the cylinder's wall is 0.15mm. So edge has some flashes after macrolon injection . Nothing to do with it . The question how to measure the overall length .
For metal industry it's clear-not accepted . But plastic is different . I'm looking for some standard defines that cases.

Just trim the flash off, and inspect to spec.

20K per month .
The issue is gap between supplier and Incoming control in drawing understanding .

From your description of the "wasted material," the drawing has specific requirements for cylinder wall thickness. I must make the assumption that (1)cylinder(s) is spun injected to get the maximum uniformity of product in the mold. (2) the only way to assure this wall thickness is to destructively test a sample of the cylinders.

This being said, the amount of material is carefully calculated to assure product uniformity. This includes an adequate seal of the mold. The less adequate the seal, the more the "flash." The more the flash, the less able the machine is able to hold tolerance; which, by judging the amount of allowed material, is very tight.

In every product, you have an "allowable" amount of scrap. You don't have a calculated allowable amount of "waste;" unless, that is, you are the Government.