- 2-Butene, (E)
A colorless gas with a faint aromatic odor.
Solvent, cross-linking agent, polymer gasoline, butadiene synth, synth of c4 and c5 derivatives.
Registry Numbers and Inventories.
EC Index Number
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
Boiling point, °C
Vapor pressure, mmHg
1750 (25 C)
Vapor density (air=1)
Odor Threshold Odor threshold 2700 mg/m3
0.6042 g/cm3 (20 C)
Solubility in water
0.0084 cp (50 C)
0.0132 g/s2 @ 25 C
Partition coefficient, pKow
0.0022/K at 20 C
Heat of vaporization
Heat of combustion
Hazards and Protection.
Store and handle in accordance with all current regulations and standards.
Handle in accordance with all current regulations and standards.
Wear appropriate protective gloves, clothing and goggles. Always wear thermal protective clothing when handling refrigerated/cryogenic liquids.
Wear positive pressure self-contained breathing apparatus (SCBA).
Make no contact with the spilled material. ELIMINATE all ignition sources, combustibles and ground all equipment. Take up with sand or other noncombustible absorbent material and place into containers for later disposal.
Stable at normal temperatures and pressure.
May react vigorously with strong oxidizers Can react exothermically to release gaseous hydrogen Reacts with alkenes and in the presence of oxygen, combustion is initiated even in the absence of moisture.
Oxides of carbon
Upper exp. limit, %
Lower exp. limit, %
Very dangerous, when exposed to heat or flame. Stop flow of gas. Extinguish fire with carbon dioxide, regular dry chemical.
Flammable gas. May cause flash fire.
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.
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.
Nausea, vomiting, and gastrointestinal hemorrhage may develop.
Vomiting, headache, symptoms of drunkenness, disorientation, suffocation, convulsions, coma. Hyperventilation may develop.
Dermal exposure may cause frostbite injury. Severe tissue burns have been reported.
Decreases in night vision, visual acuity, and visual fields (tunnel vision) may occur. Frothy mucous may be seen.
Seek medical assistance.
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.
Rewarming and a variety of topical treatments are indicated for frostbite injury. See main section for more information.
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.