Common uses include water, sewage, agriculture, petroleum and petrochemical pumping. Saudi Aramco's downstream operations are shifting emphasis to integrate refineries with petrochemical facilities. It produces petroleum, petrochemical, and lubricant products. Sources of pollution include waste materials from certain mining, agricultural, petrochemical, and industrial manufacturing operations. It manufactures industrial gas used in the oil, gas, and petrochemical industries. Other uses include military equipment and chemical, petrochemical, and electrical industries. Other important users are petrochemical, chemical, and nuclear industries. The AMTF included participants from chemical, petrochemical, and refining operations. Those olefinic gases are valuable for use as petrochemical feedstocks. Sillimanite refractory bricks are used in steel, glass and petrochemical industries. With the creation of petrochemical industries, thousands of ex-farmers became industrial workers. This standard is used in the petrochemical and hazardous chemical industries, among others. However, many Uyghurs are also employed in the mining, manufacturing, cotton, and petrochemical industries. Beijing complements this economic activity with strong petrochemical, education and R&D industries. It is specialized in oil and petrochemical products exports.