Plastic as non metal material actually can't be electroplated. While any plastic material that can coated with metal substance are using by other process of coating. Plastic coating can use by many ways. The way to coat plastic use metal material like chromium can be done by modified by gluing by metal adhesive, this adhesive have mixed by metal substance or contain metal substances.
After this plastic coated by those metal adhesive than this plastic have similar properties with metal. when this plastic been treated by electroplating process than chrome substance can be attract to the plastic. The condition for using this process should be fulfilled because many plastic material can't resist to hot condition that merge to on the chrome plating bath.
Those description just my opinion only, if you have any other think that is different or experience, please tell me, and I will adopt your thinking and will published here.
After this plastic coated by those metal adhesive than this plastic have similar properties with metal. when this plastic been treated by electroplating process than chrome substance can be attract to the plastic. The condition for using this process should be fulfilled because many plastic material can't resist to hot condition that merge to on the chrome plating bath.
Those description just my opinion only, if you have any other think that is different or experience, please tell me, and I will adopt your thinking and will published here.