Specialty Gas Equipment Abbreviations & Symbols Symbol Chemical Name Symbol Chemical Name Al2O3 Aluminum Oxide CH3SH Methyl Mercaptan Ar Argon CH4 Methane AsH3 Arsine B F Boron 11 Trifluoride CHClF2 Chlorodifluoromethane 11 3 (Halocarbon 22) B2H6 Diborane BCl Boron Trichloride CHCl2F Dichlorofluoromethane 3 (Halocarbon 21) BF3 Boron Trifluoride CHF3 Trifluoromethane (Halocarbon 23) C2ClF5 Chloropentafluoroethane (Halocarbon 115) Cl2 Chlorine C2Cl2F4 1,2-Dichlorotetrafluoroethane (Halocarbon 114) CO Carbon Monoxide C2F6 Hexafluoroethane (Halocarbon 116) CO2 Carbon Dioxide C2H2 Acetylene C H F 1,1-Difluoroethylene (Halocarbon 1132A) COCl2 Phosgene 2 2 2 COS Carbonyl Sulfide C2H3CIF2 1-Chloro-1, 1-Difluoroethane (Halocarbon 142B) D2 Deuterium C2H4 Ethylene Fe2O3 Iron Oxide C2H4F2 1,1-Difluoroethane (Halocarbon 152A) H2 Hydrogen C2H4O Ethylene Oxide H2O Water C2H5Cl Ethyl Chloride H2S Hydrogen Sulfide C2H6 Ethane H2SiCl2 Dichlorosilane C2H6O Dimethyl Ether C F Perfluoropropane (Halocarbon 218) HCl Hydrogen Chloride 3 8 HD Hydrogen Deuteride C3H4 Allene (Propadiene) C3H6 Propylene He Helium Hg Mercury C3H6O Propylene Oxide HSiCl3 Trichlorosilane C3H6O Vinyl Methyl Ether K2O Potassium Oxide C3H8 Propane C4F8 Octafluorocyclobutane (Halocarbon C-318) Kr Krypton MgO Magnesium Oxide C4H6 1,3-Butadiene N2 Nitrogen C4H6 Ethyl Acetylene N2O Nitrous Oxide C4H8 1-Butene C4H8 cis-2-Butene N2O4 Nitrogen Tetroxide C H Isobutylene Na2O Sodium Oxide 4 8 Ne Neon C4H8 Trans-2-Butene NH3 Ammonia C4H10 Butane C4H10 Isobutane NO Nitric Oxide NO2 Nitrogen Dioxide C5H12 Isopentane CaO Calcium Oxide O2 Oxygen PF5 Phosphorous Pentafluoride CBrF3 Bromotrifluoromethane (Halocarbon 13B1) CClF3 Chlorotrifluoromethane (Halocarbon 13) PH3 Phosphine SF6 Sulfur Hexafluoride CCl2FCClF2 1,1,2-Trichloro-1,2,2-Trifluoroethane (Halocarbon 113) Si Silicon SiCl4 Silicon Tetrachloride CCl2F2 Dichlorodifluoromethane (Halocarbon 12) SiF4 Silicon Tetrafluoride SiH4 Silane CCl3F Trichlorofluoromethane (Halocarbon 11) SiO2 Silicon Dioxide CF4 Tetrafluoromethane (Halocarbon 14) SO2 Sulfur Dioxide CH3Cl Methyl Chloride Xe Xenon Specialty Gas Equipment Abbreviations & Symbols Cont. Symbol Symbol A G Å Angstrom(s) g gram(s) AA Atomic Absorption gal gallon(s) abs absolute GC Gas Chromatography or ACGIH American Conference of Chromatograph Governmental Industrial Hygienists GMIS Gas Manufacturers Intermediate ASTM American Society for Testing Standard Materials GPA Gas Processors Association atm atmosphere(s) avg average H Hall Electrolytic Conductivity Detector B HAP Hazardous Air Pollutants bp boiling point HID Helium lonization Detector Btu British thermal unit(s) hr hour Hz hertz C CAA Clean Air Act I cal calorie(s) ICP Inductively Coupled Plasma CAS Chemical Abstract Services (Spectroscopy) ccm cubic centimeter(s) per minute ID Identification or inside diameter ccs cubic centimeter(s) per second in, ins inch(es) CEM Continuous Emission Monitor in3, cu in cubic inch(es) cf cubic feet CFCs Chlorofluorocarbons J CFR Code of Federal Regulations J joule CGA Compressed Gas Association K cm centimeter(s) cm2 square centimeter K Kelvin cm3, cc cubic centimeter kg kilogram(s) COA Certificate of Analysis kPa Kilo pascal(s) COC Certificate of Conformance ºK degree(s) Kelvin CP Chemically Pure L Cp specific heat at constant pressure L liter(s) Cv specific heat at constant volume lb pound(s) Cv coefficient of flow LC Liquid Chromatography ºC degree(s) Celsius Lpm liters per minute D M DID Discharge lonization Detector ␮ micron(s), 10-5m DIN Deutsche Industrie Normen m3 cubic meter(s) (German Industrial Standards) mA milliampere DISS Diameter Index Safety System max maximum DOT Department of Transportation mg milligram(s) E min minute(s) ea each ml milliliter(s) ECD Electron Capture Detector mm millimeter(s) EPA Environmental Protection Agency MNPT Male National Pipe Thread mol.wt. molecular weight F MOS Metal Oxide Semiconductor ºF degree(s) Fahrenheit MW molecular weight FID Flame lonization Detector mp melting point FNPT Female National Pipe Thread MS Mass Spectrometry F.O.B. Freight on Board MSD Mass Selective Detector FPD Flame Photometric Detector MVCR Male VCR ft foot, feet MVFS Male Vacuum Face Seal 3 ft , cu ft Cubic foot (feet) N FTIR Fourier Transform Infrared Spectrometer or Spectroscopy N/A not applicable FIFRA Federal Insecticide, Fungicide, and nbp normal boiling point Rodenticide Act NDIR Non-Dispersive Infrared Analyzer Specialty Gas Equipment Abbreviations & Symbols Cont. Symbol Symbol NDUV Non-Dispersive Ultraviolet Analyzer S NER normal evaporation rate SCC standard cubic centimeters NF National Formulary sccm standard cubic centimeters per NFPA National Fire Protection Association minute NIST National Institute of Standards and sccs standard cubic centimeters per Technology second nm nanometer(s) scfh standard cubic feet per hour No number scfm standard cubic feet per minute nom nominal scfs standard cubic feet per second NOS not otherwise specified sec second(s) NPD Nitrogen/Phosphorous Detector SFC Supercritical Fluid Chromatography NPT National Pipe Thread SFE Supercritical Fluid Extraction NTP Normal temperature and pressure slpm standard liters per minute NTRM NIST Traceable Reference Material sp. gr. specific gravity NMR Nuclear Magnetic Resonance sp. vol. specific volume Spectroscopy SRM Standard Reference Materials O SS Stainless Steel Stn. Stl. Stainless Steel OD outside diameter STEL Short Term Exposure Limit Ohm-cm ohms centimeter STP standard temperature and pressure OSHA Occupational Safety and Health Administration T oz ounce(s) TCD Thermal Conductivity Detector P TEA Transversely Excited Atmosphere THC Total Hydrocarbon Content Pa pascal(s) TLV Threshold Limit Value PID Photo Ionization Detector tp triple point ppb part(s) per billion TPH Total Petroleum Hydrocarbons ppba part(s) per billion atomic TWA Time Weighted Average ppbv part(s) per billion by volume ppbw part(s) per billion by weight U ppm part(s) per million UHP Ultra High Purity ppma part(s) per million atomic UN United Nations ppmv part(s) per million by volume USP United States Pharmacopoeia ppmw part(s) per million by weight UPC Ultra Pure Carrier ppt parts(s) per trillion ppta Parts(s) per trillion atomic V pptv Parts(s) per trillion by volume VAC volts alternating current pptw Parts(s) per trillion by weight VDC volts direct current psi pound(s)-force per square inch VOC Volatile Organic Compounds psia pound(s)-force per square inch Vol volume absolute Vol% volume percent psig pound(s)-force per square inch gauge W w.c. water column pressure R wt. weight Ra Roughness average wt% weight percent RFO restricted flow orifice wt. ppm weight parts per million ºR degree(s) Rankine Y yd yard(s) > greater than < less than.