I'm trying to model an injection molding process in which about 3.5% of the input materials are actually turned into scrap plastic. Therefore, 1.0363 kg of polycarbonate granulate is needed to be inputted in order to get 1 kg of injection-molded polycarbonate pieces (.0363 kg /1.0363 kg = .035 kg = 3.5%). I am not including the disposal/recycling of this waste scarp within the scope of my LCA. I only want to make sure I'm correctly accounting for the extra amount of input required to get 1 kg of output.

My question is: when defining the inputs/outputs of the polycarbonate in the openLCA process, do I need to define it in this way?

- inputs: 1.0363 kg polycarbonate granulate
- outputs: 1 kg of injection molded polycarbonate pieces (reference flow) AND .0363 kg polycarbonate granulate

Or do I not need to include the .0363 kg polycarbonate as an output? So that the polycarbonate inputs/outputs of the process would be:

- inputs: 1.0363 kg polycarbonate granulate
- outputs: 1 kg of injection molded polycarbonate pieces (reference flow)