Plastic

It is a shared-use checkpoint between refinery planning and advanced goods; track its consumers before allocating the output.

When it fits: Include it when a named project needs plastic and confirm that the refinery chain can sustain it.

The tradeoff: One source recipe run makes 18 and lists 6 Ethanol, 4 Chlorine at Polymerization plant; 2 recipe variant(s) for this output are grouped together. Verify access where the pack is incomplete. Plastic ties the target to petrochemical and gas inputs, which may also support fuel and other chemical products.