Supplier Product Identification Physical and Chemical Properties First Aid Measures Handling and Storage Hazards Identification Exposure Controls/Personal Protection Fire Fighting Measures Accidental Release Measures Stability and Reactivity Transport Information
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Narcylen(74-86-2)

Supplier Product Identification Physical and Chemical Properties First Aid Measures Handling and Storage Hazards Identification Exposure Controls/Personal Protection Fire Fighting Measures Accidental Release Measures Stability and Reactivity Transport Information

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
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