The petrochemical industry is an industrial sector that is involved in the organic sector of the chemical industry, with downstream (manufacturing), fabrication or compounding activities, or with the petroleum refining industry. The petrochemical industry also includes the treatment of hydrocarbon streams from the petroleum refining industry and natural gas liquids from the oil and gas production industry. The petrochemical industry produces solvents and chemicals of various grades or specifications which are used to produce industrial organic chemicals, including benzene, the butylenes, cresols and cresylic acids, ethylene, naphthalene, paraffins, propylene, toluene, and xylenes. Approximately 2500 organic chemical products are produced directly or indirectly from basic petrochemicals. The industrial organic chemicals produced from petrochemicals are employed in downstream industries including plastics and resins, synthetic fibers, elastomers, plasticizers, explosives, surface active agents, dyes, surface coatings, pharmaceuticals, and pesticides.