On October 29th, 2020, Shandong Deshunyuan Petroleum Sci& Tech. Co., Ltd accepted the on-site inspection by the quality certification inspection team of CNPC and gained a full understanding and affirmation of the production capacity and quality control level through the data inspection, communication and on-site observation of the inspection operation of quality inspectors. It was agreed that the two products added by the company this time: Sulfomethyl Phenolic Resin SMP-1 and SMP-3, which are fully met the standard requirements of the product quality certification additions of CNPC.