| 510k | FDA Approval for Medical Device |
| AC2 | ACGIH suspected human carcinogen |
| ACX No | Available Chemicals Xchange Number |
| ADME | Administration, Distribution, Metabolism, and Excretion |
| AFFF | Aqueous Film Forming Foam |
| ALARA | As Low As Reasonably Achievable |
| ALG | Allergen (Section 3 of MSDS) |
| ALS | Advanced Life Support |
| AQTX | Aquatic Toxicity |
| ASC | Administrative Support Center |
| AST | Aboveground Storage Tank |
| Atm | Atmosphere (unit of pressure) |
| B | Background (in BEI® notation) |
| BAT | Best Available Techniques |
| BAT | Biologische Arbeitsplatztoleranz (Germany, biological tolerance values for occupational exposures) |
| BCF | Bioconcentration Factor |
| BEI® | Biological Exposure Indices (US, see ACGIH) |
| BHC | Benzene Hexachlorides |
| BHT | Butylated Hydroxytuolene |
| BLO | Blood (Section 3 of MSDS) |
| BLS | Basic Life Support |
| BNM | Bone Marrow (Section 3 of MSDS) |
| BOD | Biochemical Oxygen Demand/Biological Oxygen Demand |
| BTEX | Benzene, Toluene, Ethyl-benzene and Xylene |
| BTX | Benzene, Toluene, and Xylene |
| Bp | Boiling Point |
| C | Ceiling |
| CAR | Carcinogenic Effects |
| CAS No | Chemical Abstracts Service Number (see ACS - American Chemical Society) |
| CC | Closed Cup |
| CCP | Cleveland Closed Cup |
| CFC | Chlorofluorocarbon |
| CGI | Combustible Gas Indicator |
| CMRs | Carcinogenic, Mutagenic or toxic to Reproduction (substances) |
| CNS | Central Nervous System |
| COC | Cleveland Open Cup |
| COC | Chemical of Concern |
| COD | Chemical Oxygen Demand |
| CPG | Comprehensive Procurement Guidelines (EPA mechanism) |
| CPP | Citizen Participation Plan |
| CPR | Emergency Cardiopulmonary Resuscitation |
| CSR | Chemical Safety Report |
| CU M/CU.M | Cubic Meter |
| CVOC | Chlorinated Volatile Organic Compound |
| Ca | (Circa) about |
| Cc | Cubic Centimeter |
| Cesog | Conditionally-Exempt Small Quantity Generator |
| Conc | Concentration |
| Concen. | Concentration |
| DALYs | Disability Adjusted Life Years |
| DDT | Dichloro-Diphenyl-Trichloroethane (pesticide) |
| DGSA | Dangerous Goods Safety Advisor |
| DNEL | Derived No-Effect Level |
| DOT | Dictionary of Occupational Titles, Department of Transportation (US) |
| DRO | Designated Responsible Official |
| DSL | Department Safety Liaison |
| Decomp | Decompose |
| ECL | Environmental Conservation Law |
| ECO | Environmental Conservation Officer |
| ECn | Exposure Concentration (n% of test population) |
| ED50 | Effective Dose 50 |
| EDn | Exposure Dose (n% of test population) |
| EHS | Extremely Hazardous Substance (material listed in |
| EIS | Environmental Impact Statement (US) |
| ELAP | Environmental Laboratory Approval Program |
| EMS | Emergency Medical Services |
| ENB | Environmental Notice Bulletin (weekly bulletin published by DEC) |
| EQO | Environmental Quality Objective |
| EQS | Environmental Quality Standard |
| ERIC's | Emergency Response Intervention Cards (see ERICards) |
| ERICards | Emergency Response Intervention Cards (see ERIC's) |
| ESD | Explanation of Significant Difference |
| ET50 | Exposure Time 50 |
| FRP | Fiberglass-Reinforced Plastic |
| FSC | Federal Supply Class (US) |
| G.I./GI | Gastrointestinal |
| GPa | GigaPascal (unit of pressure) |
| GW | Groundwater |
| HASP | Health and Safety Plan |
| HCB | Hexachlorobenzene |
| HCFC | Hydrochlorofluorocarbon |
| HDPE | High-Density Polyethylene |
| HEPA Filter | High Efficiency Particulate Air Filter |
| HFCs | Hydrofluorocarbons |
| HPVCs | High Production Volume Chemicals |
| HRS | Hazard Ranking System |
| HW | Hazardous waste |
| HazMat | Hazardous Material |
| I | Intermittent |
| I.V. | Intravenous |
| IBP | Initial Boiling Point |
| ICM | Interim Corrective Measures |
| ICSC | International Chemical Safety Card |
| IDL | Instrument Detection Limit |
| IDLH | Immediately Dangerous to Life or Health |
| IFO | Instructions For Use |
| IMM | Immune System |
| IMM | Immune system |
| INV | Inventory Status |
| IP | Ionization Potential |
| IRM | Interim Remedial Measures |
| IRR | Irritant (Section 3) |
| ISR | Investigative Summary Report |
| IVN | Intravenous (see also IV) |
| Inds | Indicators |
| Inhl | Inhalation |
| Insol | Insoluble |
| KID | Kidney |
| Kg | Kilogram |
| Kow | Octanol/Water Partition Coefficient |
| L | Liter |
| LC | Lethal Concentration |
| LC50 | Median Lethal Concentration |
| LCLO | Lowest Lethal Airborne Concentration Tested (see also LC50, LD50) |
| LD | Lethal Dose |
| LD50 | Median Lethal Dose |
| LDLO | Lowest Lethal Dose Tested (see also LC50, LD50) |
| LEL | Lower Explosive Limit/Lower Explosion Limit |
| LEPC | Local Emergency Planning Committee |
| LEPC | Local Emergency Planning Committee (US) |
| LEV | Local exhaust ventilation |
| LFL | Lower Flammable Limit |
| LFM | Linear Feet per Minute |
| LNG | Liquified Natural Gas |
| LPG | Liquified Petroleum Gas |
| LPVCs | Low Production Volume Chemicals |
| LTTD | Low Temperature Thermal Desorption (contaminated soil treatment) |
| LUN | Lung (Section 3 of MSDS) |
| LUST | Leaking Underground Storage Tank |
| MAK | Maximale Arbeitsplatz-Konzentrazion (Germany, Maximum Workplace Concentration, see OEL) |
| MCAA | Monochloroacetic Acid |
| MCL | Maximum Contaminant Level |
| MDI | Diphenylmethane Diisocyanate |
| MDL | Method Detection Limit |
| MEK | Methyl Ethyl Ketone |
| MEL | Maximum Exposure Limit |
| MFAG | Medical First Aid Guide |
| MIBK | Methyl Isobutyl Ketone |
| MIR | Merchandise Inventory Receipt (US) |
| MLC | Median lethal concentration |
| MLD | Mild Irritation Effects |
| MPa | MegaPascal (unit of pressure) |
| MRL | Maximum Residue Limit |
| MSDS | Material Safety Data Sheet |
| MTBE | Methyl Tertiary Butyl Ether |
| MUT | Mutagen (Section 3 of MSDS) |
| MW | Molecular Weight |
| N/A | Not Applicable |
| N/Ap | Not Applicable |
| N/K | Not Known |
| NA Number | North American Number (used in Canada and US, see also UN Number, PIN) |
| NCE | New Chemical Entity |
| NCP | National Contingency Plan |
| ND | Not Detected |
| ND, N/D | Not Determined |
| NEO | Neoplastic Effects |
| NIIN | National Item Identification Number (US) |
| NOAEL | No Observed Adverse Effect Level |
| NOEL | No Observable Effect Level |
| NOS | Not Otherwise Specified |
| NRC | National Response Center (US) |
| NRP | National Response Team |
| NSN | National Supply Number (US) |
| NTO | No Target Organs (Section 3 of MSDS) |
| NTP-K | National Toxicology Program-Known to be a carcinogen |
| NTP-R | National Toxicology Program-Reasonably anticipated to be a carcinogen |
| NUI | Nuisance dust (Section 3 of MSDS) |
| NVOC | Non-Volatile Organic Compound |
| Nox | Oxides of Nitrogen |
| Ns | Nonspecific (in BEI® notation) |
| ODS | Ozone-Depleting Substances |
| OEL | Occupational Exposure Limits |
| OES | Occupational Exposure Standard |
| OIC | Official In Charge |
| ORATS | Online European Risk Assessment Tracking System |
| OSB | Oriented Strand Board |
| OSOR | One Substance, One Registration principle |
| Orm-D Label | Consumer Commodity Label |
| P | Partition Coefficient |
| P.O. | per os (oral administration) |
| P2 | Pollution Prevention (plan) |
| PAH | Polynuclear Aromatic Hydrocarbons (see PNA) |
| PAPR | Powered Air Purifying Respirator |
| PBTs | Persistent, Bioaccumulative and Toxic substances |
| PCB | Polychlorinated Biphenyl |
| PCDDs | Polychlorinated Dibenzo-p-Dioxins |
| PCDFs | Polychlorinated Dibenzofurans |
| PCE | Perchloroethylene (see Perc) |
| PEC | Predicted Environmental Concentration |
| PEL | Permissible Exposure Limit |
| PF Resin | Phenol-Formaldehyde resin |
| PFCs | Perfluorocarbons |
| PG | Packing Group |
| PIN | Product Identification Number (used in Canada, see also UN Number, AN Number) |
| PMCC | Pensky-Martens Closed Cup |
| PMMN | Premanufacture Notice Number |
| PMN | Premanufacture Notice, Premarket Notice |
| PNA | Polynuclear Aromatic hydrocarbons (see PAH) |
| PNEC | Previsible Non Effect Concentration |
| PNOC | Particulates Not Otherwise Classified |
| PNOR | Particulates Not Otherwise Regulated |
| PNS | Peripheral Nervous System |
| POPs | Persistent Organic Pollutants |
| POTW | Publicly-Owned Treatment Works (sewage treatment plant) |
| PPE | Personal Protection Equipment |
| PQL | Practical Quantitation Level |
| PRA | Pest Risk Analysis |
| PRAP | Proposed Remedial Action Plan |
| PRP | Potentially Responsible Party |
| PRS | Priority Ranking System |
| PSA | Preliminary Site Assessment |
| PSI | Pounds per Square Inch |
| PUR | Polyurethane Foam |
| PUR | Polyurethane (foam) |
| PVA | Polyvinyl Alcohol |
| PVC | Polyvinyl Chloride |
| Perc | Perchloroethylene (see PCE) |
| QSAR | Quantitative Structure-Activity Relationship |
| RAR | Risk Assessment Report (EU) |
| RBCA | Risk-Based Corrective Action |
| RCF | Refractory Ceramic Fibers |
| RCP | Regional Contingency Plan |
| RDS | Primary Irritation Dose |
| REL | Recommended Exposure Limit |
| RHM | Residual Hazardous Material |
| RLN | Regulatory List Number |
| RQ | Reportable Quantity (according to 40 CFR 355) |
| RSM | Regional Safety Manager |
| S.G./sp.gr. | Specific Gravity |
| SAR | Structure-Activity Relationship |
| SCBA | Self-Contained Breathing Apparatus |
| SCP | Standards Completion Program |
| SIDS | Sudden Infant Death Syndrome |
| SISD | Spill Information System Database |
| SKN | Skin |
| SNARL | Suggested No Adverse Response Level |
| SNUR | Significant New Use Rule (see TSCA) |
| SOM | Some evidence of carcinogenicity (Section 3 of MSDS) |
| SOM | Some evidence of carcinogenicity (Section 3) |
| SPCC | Spill Prevention Control and Countermeasures Plan |
| SPL | Spleen |
| SQG | Small Quantity Generator |
| SRL | Spill Response Form |
| STEL | Short-Term Exposure Limit |
| STEV | Short-Term Exposure Value |
| STP | Standard Temperature and Pressure |
| STP | Sewage Treatment Plant |
| SUP DAT | Supply Missing Data, Supplementary Data |
| SVE | Soil Vapor Extraction |
| SVOC | Semi-Volatile Organic Compound |
| SWMU | Solid Waste Management Unit |
| T&A | Time and Activity Codes |
| TAB | Technical Assistance Bulletin |
| TCA | Trichloroethane |
| TCC | Tagliabue Closed Cup (see LCLO, LC50) |
| TCDD | Tetrachlorodibenzo Para-Dioxin |
| TCDF | Tetrachlorodibenzofuran |
| TCLO | Lowest Toxic Airborne Concentration Tested |
| TCLP | Toxicity Characteristic Leaching Procedure |
| TDG | Transportation of Dangerous Goods |
| TDLO | Lowest Toxic Dose Tested |
| TLM | Threshold Limit, Median |
| TLV-A1 | Threshold Limit Value-Confirmed Human Carcinogen |
| TLV-A2 | Threshold Limit Value-Suspected Human Carcinogen |
| TLV-A3 | Threshold Limit Value-Confirmed Animal Carcinogen |
| TLV-A4 | Threshold Limit Value-Not Classifiable as a Human Carcinogen |
| TLV-A5 | Threshold Limit Value-Not Suspected as a Human Carcinogen |
| TLV-C | Threshold Limit Value-Ceiling |
| TLV® | Threshold Limit Value |
| TOC | Tagliabue Open Cup |
| TPQ | Threshold Planning Quantity (according to 40 CFR 355) |
| TSDF | Treatment, Storage or Disposal Facility |
| TSRAL | Temporary Safe Reference Action Level |
| TWA | Time-Weighted Average |
| Tk | Toxicokinetics |
| Torr | Torricelli (unit of pressure) |
| UEL | Upper Explosion Limit/Upper Explosive Limit |
| UFL | Upper Flammable Limit |
| UN Number | United Nations Number (see also AN Number, PIN) |
| UNK | Unknown |
| UNR | Unreported |
| USM | Universal Sorbent Materials |
| USOS | US Occupational Health Standard |
| UST | Underground Storage Tank |
| UV | Ultraviolet |
| VD | Vapour Density |
| VOA | Volatile Organic Analysis |
| VOC | Volatile Organic Compound |
| VPEL | Vacated PEL (see PEL) |
| WEEL | Workplace Environmental Exposure Limit (see AIHA) |
| WGK | Wassergefährdungsklasse (Water Hazard Class under German Federal Water Management Act) |
| WHC | Water Hazard Class |
| WWTP | Waste Water Treatment Plant |
| XPS | Extruded Polystyrene Foam |
| XRF | X-Ray Fluorescence |
| ZHE | Zero Headspace Extractor |
| cgs | Centimeter, Gram, Second (metric system) |
| eV | electronVolt |
| f/cc | Fibres per Cubic Centimetre of air (see also fcc) |
| fcc | Fibres per Cubic Centimetre of air (seel also f/cc) |
| g/gms | Grams |
| kJ/mol | Kilojoules per mole |
| kPa | KiloPascal (unit of pressure) |
| m3 | Cubic Meter |
| mg | Milligram |
| ml | Milliliter |
| ml Hg | Milliliters of Mercury |
| mp | Melting point |
| n- | normal (in chemical names) |
| n.o.s. | Not Otherwise Specified |
| nm | nanometer |
| ppb | Parts Per Billion |
| pph | parts per hundred (= percent) |
| ppm | Parts Per Million |
| ppt | parts per trillion |
| psia | Pounds per Square Inch Absolute |
| psig | Pounds per Square Inch Gauge |
| vPvBs | Very Persistent and Very Bioacccumulative substances |