has role
waste material
A material which is not the desired output of a process and which is typically the input of a process which removes it from its producer (e.g. a disposal process).
This seems more like a role than a material. Anything can be waste. Thus, a "waste" role or disposition will be created and this class can then be populated by inference: any environmental material which has [role,disposition] waste will be considered a waste material.
environmental material
waste role