Structured Lists Directory

Overview

Chemical Compounds and CAS Registry Numbers

CAS Registry Numbers are unique identifiers assigned by the Chemical Abstracts Service (CAS) of the American Chemical Society (ACS) to chemical substances. In operation since 1957, the registry now contains over 290 million substances. This dataset includes common chemicals such as water, ethanol, and acetone, along with their CAS Registry Numbers, molecular formulas, and uses. CAS numbers are internationally recognized and widely used by regulatory agencies, research institutions, and industries worldwide.

chemistry CAS Registry Number chemical substances chemical database molecular formula organic compounds inorganic compounds
code slug name description casNumber category molecularFormula synonyms uses
001 water Water The most fundamental compound essential for life and the most common solvent. 7732-18-5 inorganic H2O ["Dihydrogen monoxide","Oxidane","H2O"] ["Solvent","Drinking","Coolant","Industrial raw material","Agricultural irrigation"]
002 ethanol Ethanol The most common alcohol, widely used as a beverage, fuel, and solvent. 64-17-5 organic C2H6O ["Ethyl alcohol","Grain alcohol","Methylcarbinol"] ["Beverage","Disinfectant","Fuel","Solvent","Cosmetic ingredient"]
003 acetone Acetone The simplest ketone, widely used as an organic solvent in laboratories and industry. 67-64-1 organic C3H6O ["Propanone","Dimethyl ketone","2-Propanone"] ["Organic solvent","Nail polish remover","Industrial raw material","Cleaning agent","Adhesive ingredient"]
004 benzene Benzene The most fundamental aromatic hydrocarbon and an important raw material in the chemical industry. 71-43-2 organic C6H6 ["Benzol","Cyclohexatriene","Phenyl hydride"] ["Chemical industry raw material","Styrene production","Phenol production","Synthetic fiber precursor"]
005 methanol Methanol The simplest alcohol, used as a fuel and solvent. 67-56-1 organic CH4O ["Methyl alcohol","Wood alcohol","Carbinol"] ["Fuel","Solvent","Chemical raw material","Biodiesel feedstock","Antifreeze"]
006 formaldehyde Formaldehyde The simplest aldehyde, used in resin manufacturing and disinfection. 50-00-0 organic CH2O ["Methanal","Oxymethylene","Formalin (aqueous solution)"] ["Synthetic resin raw material","Adhesive","Disinfectant","Preservative","Textile finishing agent"]
007 sulfuric-acid Sulfuric Acid The most important industrial chemical, forming the basis of many chemical processes. 7664-93-9 inorganic H2SO4 ["Oil of vitriol","Dihydrogen sulfate","H2SO4"] ["Fertilizer production","Chemical fibers","Dyes","Petroleum refining","Battery electrolyte"]
008 sodium-chloride Sodium Chloride The most common salt, used as a food seasoning and important raw material in the chemical industry. 7647-14-5 inorganic NaCl ["Table salt","Common salt","Halite","Rock salt","NaCl"] ["Food seasoning","Chemical raw material","De-icing agent","Preservative","Water treatment"]
009 sodium-hydroxide Sodium Hydroxide An important industrial chemical with strong basicity. 1310-73-2 inorganic NaOH ["Caustic soda","Lye","Sodium hydrate","NaOH"] ["Soap manufacturing","Pulp and paper production","Petroleum refining","Chemical fibers","Wastewater treatment"]
010 argon Argon The most abundant noble gas in the atmosphere, widely used as an inert gas. 7440-37-1 element Ar ["Argon gas","Ar"] ["Arc welding","Light bulb filling gas","Semiconductor manufacturing","Cryogenic experiments","Food packaging"]
011 hydrogen Hydrogen The most abundant element in the universe, gaining attention as a clean energy source. 1333-74-0 element H2 ["Hydrogen gas","H2","Dihydrogen"] ["Fuel cells","Petroleum refining","Ammonia production","Hydrogen welding","Balloons"]
012 oxygen Oxygen An element essential for sustaining life and one of the most abundant elements in the atmosphere. 7782-44-7 element O2 ["Oxygen gas","O2","Dioxygen"] ["Medical oxygen","Metallurgy","Water treatment","Space development","Combustion accelerator"]
013 nitrogen Nitrogen The most abundant element in the atmosphere, widely used as an inert gas. 7727-37-9 element N2 ["Nitrogen gas","N2","Dinitrogen"] ["Food packaging","Inert atmosphere","Ammonia production","Electronic component manufacturing","Cryopreservation"]
014 carbon-dioxide Carbon Dioxide A greenhouse gas with wide applications in beverages, fire extinguishers, and more. 124-38-9 inorganic CO2 ["Carbonic acid gas","CO2","Dry ice (solid)"] ["Carbonated beverages","Fire extinguishers","Refrigerant","Welding","Food packaging"]
015 carbon-monoxide Carbon Monoxide A toxic gas that serves as an important raw material in the chemical industry. 630-08-0 inorganic CO ["CO","Carbonic oxide"] ["Synthesis gas feedstock","Methanol production","Organic synthesis","Metal refining"]
016 dichloromethane Dichloromethane A volatile organic solvent widely used in laboratories and industry. 75-09-2 organic CH2Cl2 ["Methylene chloride","Methylene dichloride","DCM"] ["Extraction solvent","Paint remover","Foam production","Degreasing"]
017 cyclohexane Cyclohexane An important alicyclic hydrocarbon used as a raw material for nylon. 110-82-7 organic C6H12 ["Hexamethylene","Hexanaphthene"] ["Nylon precursor","Organic solvent","Chemical intermediate","Adhesive"]
018 toluene Toluene A benzene derivative widely used as a solvent and chemical raw material. 108-88-3 organic C7H8 ["Methylbenzene","Phenylmethane","Toluol"] ["Organic solvent","Paints","Adhesives","TNT production","Pharmaceutical raw material"]
019 styrene Styrene An important monomer used as a raw material for polystyrene. 100-42-5 organic C8H8 ["Vinylbenzene","Phenylethylene","Ethenylbenzene"] ["Polystyrene precursor","ABS resin","Synthetic rubber","Plastic products"]
020 trichloroethylene Trichloroethylene An organochlorine compound widely used as an industrial cleaning agent. 79-01-6 organic C2HCl3 ["Trichloroethene","TCE","Acetylene trichloride"] ["Metal cleaning","Degreasing agent","Dry cleaning","Chemical intermediate"]

A list of major chemical compounds with their unique CAS Registry Numbers for identification.