On April 7, Sinopec Qingdao Refining & Chemical Co., Ltd.'s quotation for propylene is $5100 per ton. The specifications of propylene are as follows: Propylene, % (V/V) - Not less than: 95%. The validity period of this quotation is 3 days. The quoting party is Sinopec Qingdao Refining & Chemical Co., Ltd.