My Brompton has a Plastic bushing and the seat post is Chrome plated steel. It must be free of oil and any Grease ..

My Bike Friday ,the seat post is Hinged , the saddle stays at a fixed height, so It does get a tiny amount of grease between the steel and aluminum parts.

IDK about yours, since you did not say.

you assume people know too much ( or boss wont let you write more on the company Computer ,on their time)