While doing research on this I keep coming upon variations of this fact:
“During World War II the availability of platinum was limited since it was declared as a strategic material. Use of platinum for most non-military applications was prohibited. After the war, consumption of platinum increased due to its catalytic properties.”
It also seems to have been declared such during WWI. The closest I can come to an answer to why it was strategic is that it comes from places like Russia which were unstable or difficult to access during those times.
What I don’t know is this: Why was platinum considered strategic during WWII and what were its “military application” during WWII.