What are insulated foam cups most likely mode out of? polymyethyene

polystyrene

nylon thread

vulcanized rubber

Polystyrene

Explanation:

Polystyrene is synthetic hydrocarbon made up of styrene monomers.

It is water proof material.

It is chemically inert that's why can not break down by the reaction of acid and bases.

It is used for the production of disposable glass, cups, plated and other dinner ware.

It is also used in packing.

Polystyrene is light weighted because it consist of almost 98% air.

Polystyrene foams are used as insulating material in buildings.

Polystyrene foam is formed by using blowing agents.

It is non-biodegradable.

Its formula is (C₈H₈) ₙ.

Its density is 0.96 - 1.05 g/cm³.

It is solid at room temperature and melt above 100°C but on cooling again it becomes rigid.