Product Identification

Product Name

Acetylenedicarboxylic acid dimethyl ester

Synonyms

1,2-Bis(methoxycarbonyl)ethyne
2-Butynedioic acid, dimethyl ester
Acetylenedicarboxylic acid, dimethyl ester
Bis(carbomethoxy)acetylene
Dimethyl 1,2-acetylenedicarboxylate
Dimethyl ethynedicarboxylate

CAS

762-42-5

Formula

C6H6O4

Molecular Weight

142.11000000000001

EINECS

212-098-4

RTECS

ES0175000

RTECS Class

Agricultural Chemical and Pesticide

Beilstein/Gmelin

607063

Beilstein Reference

4-02-00-02291

EC Class

corrosive

Physical and Chemical Properties

Appearance

Clear slightly yellow liquid.

Solubility in water

Slightly soluble

Melting Point

-18

Boiling Point

204

Vapor Pressure

0.3 (25 C)

Density

1.1532 g/cm3 (20 C)

Partition Coefficient

1.5

Heat Of Vaporization

44.1 kJ/mol

Refractive Index

1.4439 (20 C)

First Aid Measures

Ingestion

Never give anything by mouth to an unconscious person. Get medical aid immediately. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water.

Inhalation

Get medical aid immediately. Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. DO NOT use mouth-to-mouth respiration.

Skin

Get medical aid immediately. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Destroy contaminated shoes.

Eyes

Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.

Handling and Storage

Storage

Keep away from heat, sparks, and flame. Store in a cool, dry place. Store in a tightly closed container. Corrosives area.

Handling

Wash thoroughly after handling. Use only in a well ventilated area. Do not get in eyes, on skin, or on clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Do not ingest or inhale. Discard contaminated shoes. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.

Hazards Identification

Inhalation

May cause cyanosis, characterized by bluish-colored skin. Causes chemical burns to the respiratory tract. Inhalation may be fatal as a result of spasm, inflammation, edema of the larynx and bronchi, chemical pneumonitis and pulmonary edema.

Skin

Causes skin burns.

Eyes

Causes eye burns. Lachrymator.

Ingestion

Causes gastrointestinal tract burns. May cause methemoglobinemia, cyanosis, convulsions, and death.

Hazards

When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards.

EC Risk Phrase

R 21/22 34 36

EC Safety Phrase

S 26 36/37/39 45

UN (DOT)

2810

Exposure Controls/Personal Protection

Personal 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

Wear a NIOSH/MSHA or European Standard EN 149 approved full-facepiece airline respirator in the positive pressure mode with emergency escape provisions. Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.

Exposure Effects

Chronic inhalation and ingestion may cause effects similar to those of acute inhalation and ingestion.

Poison Class

3

Fire Fighting Measures

Flash Point

86

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. Combustible Liquid. Containers may explode if exposed to fire. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam. Use agent most appropriate to extinguish fire. Cool containers with flooding quantities of water until well after fire is out.

Fire Potential

Combustible material: may burn but does not ignite readily.

Accidental Release Measures

Small spills/leaks

Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Clean up spills immediately, using the appropriate protective equipment. Remove all sources of ignition. Provide ventilation.

Stability and Reactivity

Disposal Code

1

Stability

Stable under normal temperatures and pressures.

Incompatibilities

Strong oxidizing agents, strong acids, strong bases, and strong reducing agents. Explosive reaction with 1-methylsilacyclopenta-2,4-diene at 150 C. Octakis(trifluorophosphine)dirhodium catalyzes explosive polymerization of the acid above 20 C.

Decomposition

Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.

Combustion Products

Fire may produce irritating, corrosive and/or toxic gases.

Transport Information

UN Number

2810

Hazard Class

6.1

Packing Group

I; II; III

HS Code

2917 19 90