Is polystyrene highly flammable?

Online Answer
Polystyrene is highly flammable and ignites at relatively low temperatures. It has been linked with huge fires, often in commercial buildings and warehouses, where its use is more common.
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Products derived from plastics, and those especially from oil, tend to be seen as environmentally unfriendly. Polystyrene is also slow to biodegrade which adds to its poor reputation among environmentalists..
Polystyrene is highly flammable and ignites at relatively low temperatures. It has been linked with huge fires, often in commercial buildings and warehouses, where its use is more common.