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67-68-5

Name Dimethyl sulfoxide
CAS 67-68-5
EINECS(EC#) 200-664-3
Molecular Formula C2H6OS
MDL Number MFCD00002089
Molecular Weight 78.13
MOL File 67-68-5.mol

Chemical Properties

Appearance colourless liquid
Melting point  18.4 °C
Boiling point  189 °C(lit.)
density  1.100 g/mL at 20 °C
vapor density  2.7 (vs air)
vapor pressure  0.42 mm Hg ( 20 °C)
FEMA  3875
refractive index  n20/D 1.479(lit.)
Fp  192 °F
storage temp.  Store at RT.
solubility  H2O: miscible (completely)
form  liquid (temperature dependent)
pka 35(at 25℃)
color  clear colorless
Odor Mild garlic odor
Relative polarity 0.444
Stability: Stable. Incompatible with a very wide range of materials, including acid chlorides, strong acids, strong oxidizing agents, strong reducing agents, phosphorus halides, moisture, copper wool + trichloroacetic acid. Reacts violently with a number of materials-consult a full data sheet before use. Hygroscopic.
explosive limit 1.8-63.0%(V)
Odor Type alliaceous
Water Solubility  Soluble in water, methanol, acetone, ether, benzene, chloroform.
FreezingPoint  18.4℃
Sensitive  Hygroscopic
λmax λ: 285 nm Amax: ≤0.20
λ: 295 nm Amax: ≤0.20
JECFA Number 507
Merck  14,3259
BRN  506008
Dielectric constant 41.9(55℃)
InChIKey IAZDPXIOMUYVGZ-UHFFFAOYSA-N
LogP -1.35
CAS DataBase Reference 67-68-5(CAS DataBase Reference)
NIST Chemistry Reference Dimethyl sulfoxide(67-68-5)
Storage Precautions Store under nitrogen
EPA Substance Registry System 67-68-5(EPA Substance)

Safety Data

Hazard Codes  Xi
Risk Statements 
R36/37/38:Irritating to eyes, respiratory system and skin .
Safety Statements 
S24/25:Avoid contact with skin and eyes .
S37/39:Wear suitable gloves and eye/face protection .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing .
S23:Do not breathe gas/fumes/vapor/spray (appropriate wording to be specified by the manufacturer) .
RIDADR  NA 1993 / PGIII
WGK Germany  1
RTECS  PV6210000
3
Autoignition Temperature 215 °C
TSCA  Yes
HS Code  29309070
Safety Profile
Slightly toxic by ingestion. Moderately toxic by intravenous and intraperitoneal routes. Human systemic effects by intravenous route: nausea or vomiting and jaundice. Experimental teratogenic and reproductive effects. A skin and eye irritant. Questionable carcinogen with experimental tumorigenic data. Human mutation data reported. Can cause an anaphylactic reaction. Corneal opacity reported only in rabbits, dogs, and pigs. It freely penetrates the skin and may carry dissolved chemicals with it into the body. Combustible when exposed to heat or flame; can react with oxidizing materials. To fight fire, use water, foam, alcohol foam, CO2, dry chemical. Violent or explosive reaction with many acyl, aryl, and nonmetal halides (e.g., acetyl chloride, benzenesulfonyl chloride, bromobenzoyl acetadde, cyanuric chloride, iodine pentafluoride, Mg(ClO4)2, CH3Br, NI04, oxalyl chloride, P203, phosphorus trichloride, phosphoryl chloride, silver fluoride, silver difluoride, sodium hydride, sulfur dichloride, disulfur dichloride, sulfuryl chloride, tetrachlorosilane, thionyl chloride). Violent or explosive reaction with boron compounds (e.g., borane, nonahydrononaborate(2-) ion), 4(4' bromobenzoyl)acetanilide, carbonyl dhsohocyanate, dinitrogen tetraoxide, hexachlorocyclotriphosphazine, copper + trichloroacetic acid, metal alkoxides (e.g., potassium tert-butoxide, sodium isopropoxide), trifluoroacetic acid anhydride. Incompatible with magnesium perchlorate, metal oxosalts, perchloric acid, periodc acid, sulfur trioxide. Forms powerfully explosive mixtures with metal salts of oxoacids (e.g., aluminum perchlorate, sodrum perchlorate, iron(IⅡ) nitrate). When heated to decomposition it emits toxic fumes of SOx
Hazardous Substances Data 67-68-5(Hazardous Substances Data)

Hazard Information

Material Safety Data Sheet(MSDS)

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