ICBC freezes the number of products held by customers in the previous issue at 22: 05 on the closing day of the previous issue, and the freezing lasts until the end of the exhibition period, usually until 7: 05 or later the next day.

Customers can turn on or off the extension function at any time except the freezing time (including the trading time before the expiration of the previous product). Once the expiration extension is started, it will be effective for a long time until the customer turns off the expiration extension function.

According to the extension method selected by customers, ICBC distinguishes the transaction types of buying before selling and selling after buying according to the maturity settlement price of the previous product and the extension settlement price of the next product on the same day, and handles the extension settlement on the day after the product expiration date. The settlement rules for the due extension are the same as those for the optional extension.

The maturity extension of crude oil in ICBC's personal account refers to the extension when the previous product expires, and the bank completes the extension operation on the day after the product expiration date according to the settlement price of the previous product, the current settlement price of the next product and the selected extension method.