what standards on use of secondary processing of plastic are?

[designer]

could you please help me what standards on use of secondary processing of plastic are?

How many percent are allowed to add when recycling plastic? How can exchange mechanical and chemical physical properties from use of secondary raw materials?

What recommendations of producers of raw materials for molding of plastic under pressure are?

Me interests granulated polycarbonate without cretaceous filler.

[Suhas]

There is no definite answer on the %. It will all depend on the product. You must mold parts with varying % of regrind and do the testing. In some cases, you may find you can use 100% regrind and in others may be 10% is detrimental.
Sorry, no sure answer here. may be some other replies will help.
Regards,
Suhas

[designer]

Is there standart about secondary processing of plastic?

May be in DIN, ISO or ASME system?