Need Help to Determine Injection Mold Porosity

You may be able to find this in a mechanical or material standard relating to either your material or the application your material is going to be used for. For example if your material is being used as a high voltage insulator you may find this in the standard relating to insulators.

Alternatively mechanical and electrical testing (to applicable standards relating to the materials application) may be enough to prove that the product is fit for purpose.

Your customer should be able to assist to some extent with regard to intended application and possibly even relevant standards or acceptance testing.

You should also consult an electrical/mechanical testing laboratory for further advice (and possibly testing) once you know what the end use of the material is for. They should be able to offer more specific guidance.

If you were making the part for me the answer would be zero. If you can't mold parts without voids, you process is not under control. Do you have cavity pressure monitors?

Maybe your customer will accept defective parts, I wouldn't.

I doubt you will have excellent electrical properties if your parts have voids.

Regrind and start over.

Review your dfmea and check which failure modes are affected by porosity, and what level of porosity results in your component not being able to fulfill it's functions for the product design life...

Molded material shall have no porosity if the compounding process was very very well, presence of the porosity is not acceptable for molding and will cause bad mechanical and electrical properties for your finish goods as well as problem for your process, Actually you will not find standard specify this according to compound material. By the way, porosity is just important during compounding as the resin (PE for example) shall have this metallurgic characteristic to allow absorption plasticizers during compounding process. So if you talking about porosity in finish good that is not acceptable, but in polymers you will find some help in ASTM standards or you can contact you raw material supplier/s to get some support. Thanx, Eng.Elaji