Five tons. It costs about 5,000 yuan to buy primary styrene, and 5 tons of primary styrene is traded in futures. Styrene futures is a variety listed on Dalian Commodity Exchange, which belongs to ordinary commodity futures. There is no capital threshold requirement for futures accounts. Only after opening an account, investors can meet the first-hand deposit funds, and futures account is also very simple, and the whole process is handled online. Before futures account, you need to prepare the original ID card, bank card, pen and paper.