5
Physical Properties of DMSO
Some of the physical properties of DMSO are included in the following table.
For a more extensive list,
please refer to Gaylord's Bulletin 101, "Dimethyl Sulfoxide (DMSO) Physical
Properties."
Solubility
A large amount of solubility data has been compiled. Please refer to Gaylord's
Bulletin 102, "Dimethyl Sul-
foxide (DMSO) Solubility Data" for information on solubility of organic, inorganic,
and pharmaceutical com-
pounds.
Reactivity
DMSO reacts very rapidly and vigorously with a number of materials, particularly
with those that also react
rapidly with water. The reactions are highly exothermic, with rapid steam
or gas evolution. In most cases
these reactions can be controlled by rate or order of addition or by arranging
adequate heat removal. The
following types of compounds require care to prevent extremely rapid reactions.
1. Strong oxidizing agents such as perchlorates, permanganates, iodine pentafluoride,
silver fluoride and
others
react very rapidly.
2. Acid
chlorides react with DMSO at about the same rate as with ethyl alcohol.
3. Carboxylic acid anhydrides react rapidly.
4. Alkali hydrides used for making DMSO anion require adequate heat removal.
(A technical bulletin on re-
actions
of the dimsyl anion is available.)
Physical
Property
Metric
Units
English
Units
Freezing
Point
18.55°C
65.4°F
Boiling
Point - 760 mm
189°C
372
° F
Vapor
Pressure - 0.6 in Hg
25 °C
77°F
- 13
in Hg
100
°
C
212
°
F
- 310
in Hg
150°C
302
°
F
Heat
of Vaporization @ 70
°
C
11.3
Kcal/mol
260
BTU/lb.
Flash
Point (open cup)
95°C
203°
F
Flash
Point (closed cup)
89°C
192°F
Auto-ignition
Temperature in Air
300-302
° C
572-575
° F
Flammability
Limits in Air -
Lower (100
°
C)
Upper
3-3.5%
by volume
42-63%
Solubility
Parameter, Total
13 (cal/cm
3
)
1/2