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LCL: Lethal Concentration Low, the lowest concentration of a gas Pyrophoric: A chemical that will ignite spontaneously in air at a
or vapor capable of killing a specified species over a specified time. temperature of 130°F (54.4°C) or below.
LDL: Lethal Dose Low, is the lowest administered dose of a material Reactivity: Chemical reaction with the release of energy. Undesirable
capable of killing a specified test species. effects such as pressure buildup, temperature increase, formation
of noxious, toxic, or corrosive by-products may occur because of the
LD: Lethal dose is the quantity of a substance being tested that will reactivity of a substance to heating, burning, direct contact with other
kill. materials, or other conditions in use or storage.

LDL: Lethal Dose Low, lowest administered dose of a material REL: The NIOSH REL (Recommended Exposure Limit) is the
capable of killing a specified test species. highest allowable airborne concentration which is not expected to
injure the workers. It may be expressed as a ceiling limit or as a time-
LD50: A single dose of material expected to kill 50 percent of a group weighted average (TWA).
of test animals. The LD50 dose is usually expressed as milligrams
or grams of material per kilogram of animal body weight. The SDS: Safety Data Sheet. OSHA has established guidelines for the
material may be administered by mouth or applied to the skin. descriptive data that should be concisely provided on a data sheet
to serve as the basis for written hazard communication programs.
LEL or LFL: Lower Explosive Limit, or Lower Flammable Limit, of a The thrust of the law is to have those who make, distribute, and use
vapor or gas. The lowest concentration (lowest percentage of the hazardous materials be responsible for effective communication.
substance in air) that will produce a flash or fire when an ignition
source (heat, arc, or flame) is present. At concentrations lower than Sensitizer: A chemical that causes a substantial proportion of
the LEL, the mixture is too "lean" to burn. exposed people or animals to develop an allergic reaction in normal
tissue after repeated exposure to the chemical.
MSDS: Material Safety Data Sheet. OSHA has established guidelines
for the descriptive data that should be concisely provided on a data STEL: Short-Term Exposure Limit - Usually a 15-minute time-
sheet to serve as the basis for written hazard communication weighted average exposure that should not be exceeded at any time
programs. The thrust of the law is to have those who make, during a workday.
distribute, and use hazardous materials be responsible for effective
communication. TCC: Tag Closed-Cup test method. An ASTM test method of
determining flashpoint. Since our aerosols are not tested as a
NFPA RATING: National Fire Protection Association - Rating mixture using the TCC method, we are required to show the lowest
system intended to give basic information to fire fighting and component chemical flashpoint in the untested mixture.
emergency personnel in a fire situation.
TCL: Toxic Concentration Low, the lowest concentration of a gas or
NIOSH: National Institute for Occupational Safety and Health. vapor capable of producing a defined toxic effect in a specified test
species over a specified time.
NOC: Not otherwise classified.
TLV: Threshold Limit Value is a term used by ACGIH to express the
NTP: National Toxicology Program. airborne concentration of material to which nearly all persons can be
exposed day after day without adverse effects. TLV's are expressed
Odor Threshold: The lowest concentration of a substance's vapor, in three different ways:
in air, that can be smelled. TLV-TWA: The allowable Time Weighted Average
concentration for a normal 8 hour workday.
OSHA PEL: Occupational Safety and Health Administration TLV-STEL: The Short Term Exposure Limit, or maximum
Permissible Exposure Limit. concentration for a continuous 15 minute exposure period
(maximum of four such periods per day, with at least 60
PEL: Permissible Exposure Limit is an occupational exposure limit minutes between exposure periods and provided the daily
established by OSHA's regulatory authority. It may be a time- TLV-TWA is not exceeded).
weighted average (TWA) limit or a maximum concentration exposure TLV-C: The Ceiling exposure limit, the concentration that
limit. should not be exceeded even instantaneously.

PMCC: Pensky-Martens Closed Cup Flash Point test method. TOC: Tag Open-Cup test method.
Polymerization: A chemical reaction in which one or more small TWA: Time Weighted Average
molecules combine to form larger molecules. A hazardous
polymerization is such a reaction that takes place at a rate that VISCOSITY: Measurement of the flow properties of a material
releases large amounts of energy. If hazardous polymerization can expressed as its resistance to flow. Unit of measurement and
occur with a given material, the MSDS usually will list conditions that temperature are not included.
could start the reaction and since the material usually contains a
polymerization inhibitor, the length of time during which the inhibitor VOC: Volatile organic compounds. Used in coatings and paint
will be effective. because they evaporate very rapidly. Regulated by EPA per Clean
Water Act.
PPB: Parts Per Billion is the concentration of a gas or vapor in air -
parts (by volume) of the gas or vapor in a billion parts of air. Usually VOLATILITY: Measure of a material's tendency to vaporize or
used to express extremely low concentrations of unusually toxic evaporate at ambient routine conditions.
gases or vapors; also the concentration of a particular substance in
liquid or solid. *YES, YOU MAY COPY THIS SHEET IN IT'S ENTIRETY
COURTESY OF PPE!
PPM: Parts per million. "Parts of vapor or gas per million parts of
contaminated air by volume at 25°C and 1 torr pressure (ACGIH). At
25°C, ppm = (mg/m³x24.45) divided by molecular weight.
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