Methylal

  • Dimethoxymethane
  • Formal
  • Formaldehyde dimethyl acetal
Formula
CH2(OCH3)2
Structure
Description
Colorless, clear, volatile liquid, chloroform-like odor.
Uses
In perfumery, manufacture artificial resins, reaction medium for grignard & reppe reactions.

Registry Numbers and Inventories.
CAS
109-87-5
EC (EINECS/ELINCS)
203-714-2
EC Class
highly flammable
R 11 36/37
S 9 16 26 33
RTECS
PA8750000
RTECS class
Primary Irritant
UN (DOT)
1234
Merck
12,6093
Beilstein/Gmelin
1697025
Beilstein Reference
4-01-00-03026
Swiss Giftliste 1
G-2421
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C3H8O2
Formula mass
76.10
Melting point, °C
-105
Boiling point, °C
42
Vapor pressure, mmHg
400 (20 C)
Vapor density (air=1)
2.6
Saturation Concentration
4.3 x 10(5) ppm (43%) at 20 C (calculated)
Evaporization number
0.88 (butyl acetate = 1)
Critical temperature
215
Density
0.821 g/cm3 (20 C)
Solubility in water
33 g/100 mL
Viscosity
0.33 cP 30 C
Surface tension
21.1 g/s2
Refractive index
1.3589 (20 C)
Heat of fusion
7.95 kJ/mol
Heat of vaporization
30.0 kJ/mol
Heat of combustion
-1936 kJ/mol

Hazards and Protection.
Storage
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Do not store in direct sunlight. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. Flammables-area.
Handling
Ground and bond containers when transferring material. Use spark-proof tools and explosion proof equipment. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Take precautionary measures against static discharges. Keep container tightly closed. Avoid contact with heat, sparks and flame. Avoid ingestion and inhalation. Use with adequate ventilation. Wash clothing before reuse. This product may be under pressure; cool before opening. Do not use if the material has evaporated to dryness. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Protection
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, using the appropriate protective equipment. Remove all sources of ignition. Use a spark-proof tool. Provide ventilation. A vapor suppressing foam may be used to reduce vapors.
Disposal code
1
Stability
Stable at room temperature in closed containers under normal storage and handling conditions.
Incompatibilities
Strong oxidizing agents.
Decomposition
Carbon monoxide, carbon dioxide, formaldehyde.

Fire.
Flash Point,°C
-18
Autoignition, °C
235
Upper exp. limit, %
12.6
Lower exp. limit, %
3.6
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Use water spray to keep fire-exposed containers cool. Water may be ineffective. Material is lighter than water and a fire may be spread by the use of water. Containers may explode in the heat of a fire. May polymerize explosively when involved in a fire. Runoff to sewer may create fire or explosion hazard. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam. For large fires, use water spray, fog, or alcohol-resistant foam. Use water spray to cool fire-exposed containers.
Fire potential
FLAMMABLE.
Hazards
Irritating gases may be produced when heated. Containers may explode in fire. Flashback along vapor trail may occur. Vapor may explode if ignited in an enclosed area. Irritating formaldehyde gas may be present in smoke.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.
Health
1
 
Flammability
3
 
 
Reactivity
1
 

Health.
Exposure limit(s)
TLV: 1000 ppm; 3110 mg/m3 (ACGIH 1991-1992). OSHA PEL: TWA 1000 ppm (3100 mg/m3) NIOSH REL: TWA 1000 ppm (3100 mg/m3) NIOSH IDLH: 2200 ppm LEL
Poison_Class
4
Exposure effects
Prolonged or repeated skin contact may cause defatting and dermatitis. May cause liver and kidney damage. Prolonged exposure may produce a narcotic effect. Effects may be delayed.
   Ingestion
May cause gastrointestinal irritation with nausea, vomiting and diarrhea. Ingestion of large amounts may cause CNS depression.
   Inhalation
Effects may be delayed. Causes respiratory tract irritation. May cause dizziness, incoordination, and unconsciousness. Aspiration may lead to pulmonary edema. Vapors may cause dizziness or suffocation. Can produce delayed pulmonary edema. May cause burning sensation in the chest. Animals exposed to high concentrations have shown liver, kidney, heart , and lung abnormalities.
   Skin
Causes skin irritation. Prolonged and/or repeated contact may cause defatting of the skin and dermatitis. Causes redness and pain. May cause cyanosis of the extremities.
   Eyes
Causes eye irritation. Causes redness and pain. May cause chemical conjunctivitis and corneal damage.

First aid
 
   Ingestion
Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water. Wash mouth out with water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid. DO NOT use mouth-to-mouth respiration.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
1234
Response guide
Hazard class
3
Packing Group
II
 
USCG CHRIS Code
MTF
 
HS Code
2911 00 00
 
Std. Transport #
4908222