Any other fillers for plastic injection molding?

Ok so I am writing an article about injection molding and I want to get it right.

To my knowledge, there are mainly seven types of fillers used in the injection molding process:

Filler to adjust rigidity: it can be glass or carbon fiber...

Filler to reduce cost: commonly known as CaCO3 filler masterbatch

Filler to improve processing: mold release agents or lubricants...

Filler for appearance: commonly know as masterbatch (color pigment)

Filler for special application purpose: UV stabilizers,...

Is there any other types of filler I miss?

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