Dichlorodimethyl ether, symmetrical

  • bis(Chloromethyl) ether
  • oxybis[Chloromethane]
  • BCME
  • Sym-dichloromethyl ether
  • 1,1'-Dichlorodimethyl ether
  • Chloromethyl ether
Formula
(CH2Cl)2O
Structure
Description
A colorless volatile liquid with a chloroform-like odor.
Uses
As lab reagent, intermediate for ion-exchange resins.

Registry Numbers and Inventories.
CAS
542-88-1
EC (EINECS/ELINCS)
208-832-8
EC Index Number
603-046-00-5
EC Class
Flammable; Carcinogenic Category 1; Very toxic; Toxic; Harmful
RTECS
KN1575000
RTECS class
Tumorigen; Mutagen; Human Data
UN (DOT)
2249
Merck
12,3119
Beilstein/Gmelin
1679223
Beilstein Reference
4-01-00-03051
RCRA
P016
Swiss Giftliste 1
G-5473
Canada DSL/NDSL
DSL
US TSCA
Listed
New Zealand
Listed

Properties.
Formula
C2H4Cl2O
Formula mass
114.96
Melting point, °C
-41.5
Boiling point, °C
104
Vapor pressure, mmHg
29 (25 C)
Vapor density (air=1)
4
Density
1.328 g/cm3 (15 C)
Solubility in water
Decomposes
Viscosity
0.98 cp (25 C)
Surface tension
33.05 g/s2 (25 C)
Refractive index
1.4427 (20 C)
Partition coefficient, pKow
1.24
Heat of vaporization
33.1 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors.
Stability
Unstable in moist air bis(chloromethyl) ether hydrolyzes very rapidly (half-life 10 to 40 seconds) on contact with water.
Incompatibilities
Incompatible with the following: Acids, water Reacts with water to form hydrochloric acid & formaldehyde.].
Decomposition
Decomposed by water to hydrochloric acid and formaldehyde when heated to decomposition bis(chloromethyl) ether emits very toxic hydrogen chloride fumes.

Fire.
Flash Point,°C
35
Upper exp. limit, %
21.9
Lower exp. limit, %
6.5
Fire fighting
Move container from fire area if you can do so without risk. Fight fire from maximum distance. Dike fire control water for later disposal; do not scatter the material.Small fires: dry chemical, carbon dioxide, water spray, or foam. Large fires: water spray, fog, or foam.
Fire potential
Common ethers such as ethyl and methyl are particularly dangerous fire hazards. The common ones are easily ignited and have low flash points.
Hazards
Container may explode in heat of fire. When heated to decomposition, it emits very toxic fumes of chlorides. Decomposed by water to hydrochloric acid and formaldehyde. Avoid water: hydrolyzes very rapidly (half life 10-40 seconds) on contact with water. Avoid decomposing heat, powerful oxidizers, areas of high fire hazard and moist air.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
4
 
Flammability
3
 
 
Reactivity
1
 

Health.
Exposure limit(s)
TLV (as as TWA): 0.001 ppm; 0.0047 mg/m3 A1: confirmed Human Carcinogen (ACGIH 1992-1993). OSHA PEL: 1910.1008 See Appendix B NIOSH REL: Ca See Appendix A NIOSH IDLH: Potential occupational carcinogen
Carcinogin
O, G-A1, I-1, N-1, CP65
Poison_Class
1*
Exposure effects
   Ingestion
Abdominal cramps, sore throat and vomiting. See inhalation.
   Inhalation
Chronic bronchitis with chronic productive cough and dyspnea have been seen with chronic inhalation exposure.
   Skin
Redness and burning sensation.
   Eyes
Redness, pain and blurred vision.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
2249
Response guide
Hazard class
6.1
Packing Group
I
 
USCG CHRIS Code
CLE
 
Std. Transport #
4921011