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1. Gases. Examples: Diborane, phosphine, silane.
<br />2. Li uids. Examples: Diethyl aluminum chloride, diethyl beryllium,
<br />diethylphosphine, diethyl zinc, dimethylarsine, triethylaluminum
<br />etherate, triethylbismuthine, triethylboron, trimethylaluminum,
<br />trimethylgallium.
<br />3. Solids. Examples: Cesium, hafnium, lithium, phosphorus white
<br />or yellow}, plutonium, potassium, rubidium, sodium, thorium.
<br />Unstabl a Reactive Materials .
<br />CLASS 1 -Materials which in themselves are normally stable, but
<br />which can become unstable at elevated temperatures and pressures.
<br />Examples: Acetic acid, 35-52% hydrogen peroxide, paraldehyde, tetra-
<br />hydrofuran.
<br />CLASS ~ -Materials which in themselves are normally unstable and
<br />readily undergo violent chemical change but do not detonate. This
<br />class should include materials which can undergo chemical change with
<br />rapid release of energy at normal temperatures and pressures, or which
<br />can undergo violent chemical change at elevated temperatures and pres-
<br />sures. Examples: Acrolein, acrylic acid, hydrazine, methacrylic acid,
<br />sodium perchlorate, styrene, vinyl acetate.
<br />CLASS 3 -Materials which in themselves are capable of detonation
<br />or of explosive decomposition or explosive reaction, but which require
<br />a strong initiating source or which must be heated under confinement
<br />before initiation. This class should include materials which are sen-
<br />sitive to thermal or mechanical shuck at elevated temperatures and
<br />pressures. Examples: Hydrogen peroxide greater than 521}, hydra-
<br />xylamine, nitromethane, paranitroaniline, perchloric acid, tetra-
<br />fluoroethylene monomer.
<br />CLASS 4 -Materials which i n themselves are readily capable of
<br />detonation or of explosive decomposition or explosive reaction at narmal
<br />temperatures and pressures. This class should include materials which
<br />are sensitive to mechanical or localized thermal shock at normal temper-
<br />atures and pressures. Examples: Acetyl peroxide, dibuty1 peroxide,
<br />dinitrobenzene, ethyl nitrite, peroxyacetic acid, picric acid dry},
<br />trinitrobenzene.
<br />NOTE: Classification by degree of hazard shall be in accordance
<br />with UFC Standard 19-3. Alsa see NFPA Standard 49.
<br />Water Reactive Materials.
<br />CLASS ~ -Materials which may react with water with some release
<br />of energy but not violently. Examples: Acetic anhydride, sodium
<br />hydroxide, sulfer monochloride, titanium tetrachloride.
<br />CLASS 2 - Materials which may form potentially explosive mixtures
<br />with water. Examples: Calcium carbide, calcium metal, cyanogen bro-
<br />mide, lithium hydride, methyldichlorosilane, potassium metal, potassium
<br />ordinance - 89
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