Product Identification

Product Name

Narcylen

Synonyms

Acetylene (liquefied)
Ethine
Ethyne
Narcylen

CAS

74-86-2

Formula

C2H2

Molecular Weight

26.04

EINECS

200-816-9

RTECS

AO9600000

RTECS Class

Human Data

Merck

12,91

Beilstein/Gmelin

906677

Beilstein Reference

4-01-00-00939

EC Index Number

601-015-00-0

EC Class

Heating may cause an explosion; Explosive with or without contact with air; Extremely flammable

Physical and Chemical Properties

Appearance

A colorless gas with a faint garlic-like odor.

Solubility in water

16.6 g/L (20 C)

Melting Point

-81

Boiling Point

-75

Vapor Pressure

69700 (25 C)

Density

0.618 g/cm3 (-55 C)

pKa/pKb

25(at 25℃) (pKa)

Partition Coefficient

.37

Heat Of Vaporization

21.2 kJ/mol

Heat Of Combustion

-1301 kJ/mol

Usage

Illuminant, oxyacetylene welding, cutting and soldering metals, signalling, precipitating metals, manufacture of acetaldehyde, acetic acid, fuel for motor boats.

Odor threshold

620 ug/L

Refractive Index

1.00087 (0 C)

First Aid Measures

Ingestion

Seek medical assistance.

Inhalation

Administer 100% humidified supplemental oxygen with assisted ventilation as required. If hypoxia has been severe or prolonged, carefully evaluate for neurologic sequelae and provide supportive treatment as indicated.

Skin

Rewarming and a variety of topical treatments are indicated for frostbite injury. See main section for more information.

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.

Handling and Storage

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.

Hazards Identification

Inhalation

Hyperventilation may develop. Vapors may cause dizziness or asphyxiation without warning. May be toxic if inhaled at high concentrations.

Skin

Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite.

Eyes

Decreases in night vision, visual acuity, and visual fields (tunnel vision) may occur. Frothy mucous may be seen.

Ingestion

Not expected to be a route of entry.

Hazards

Vapors from liquefied gas are initially heavier than air and spread along ground. Vapors may travel to source of ignition and flash back. Containers may explode when heated.

UN (DOT)

1001

Exposure Controls/Personal Protection

Personal Protection

Wear appropriate protective gloves, clothing and goggles. Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.

Respirators

Respiratory protective equipment is not normally required but self-contained type should be available for emergency and rescue use.

Exposure Effects

Rapid breathing and rapid heart rate are common. In severe cases abnormally low blood pressure, apnea, and cardiac arrest develop. Various disturbances including headache, dizziness, mood disturbances, numbness of the extremities, sleepiness, mental confusion, poor judgement and coordination, and memory loss may occur. Prolonged or severe hypoxia results in unconsciousness. Prolonged asphyxia may produce CNS injury. Hemiparesis has been reported with volatile substance abuse. Cerebral edema with brainstem herniation may occur. Seizures have been reported following intentional inhalation.

Exposure limit(s)

NIOSH REL: C 2500 ppm (2662 mg/m3)

Poison Class

-

Fire Fighting Measures

Flash Point

-118

Autoignition

305

Fire Fighting

Extinguish fire with flooding quantities of water or use dry chemical or carbon dioxide.

Upper exp. limit

80

Lower exp. limit

2.5

Fire Potential

EXTREMELY FLAMMABLE. Will be easily ignited by heat, sparks or flames. Will form explosive mixtures with air. May ignite spontaneously in air.

Accidental Release Measures

Small spills/leaks

Make no contact with the spilled material. ELIMINATE all ignition sources, combustibles and ground all equipment. Stop leak if you can do it without risk. Do not direct water at spill or source of leak. If possible, turn leaking containers so that gas escapes rather than liquid. Isolate area until gas has dispersed.

Stability and Reactivity

Stability

High in closed containers. Highly reactive; all mixtures of C2H2 (water saturated) in air can be exploded at pressures above 2 atmospheres.

Incompatibilities

Reacts with alkali metals, forming Hydrogen gas Can react explosively with bromine Reacts with silver, copper and lead to form sensitive, explosive salts.

Decomposition

The gas mixes well with air, explosive mixtures are easily formed. The substance may polymerize due to heating. Decomposes on heating and increasing pressure , causing fire and explosion hazard.

Combustion Products

Fire may produce irritating and/or toxic gases.

Transport Information

UN Number

1001

Hazard Class

2.1