Selenium hexafluoride

192.95

192.95

H91D37I668

0947

2194

Colorless gas; white solid at low temperature

0

2.14040

Selenium hexafluoride is a colorless gas used as a electrical insulator. It is highly toxic by inhalation. When heated to high temperatures it may decompose to emit toxic fluoride and selenium fumes. Prolonged exposure of the container to fire or intense heat may cause it to violently rupture or rocket.

8.467 x 10^-3 g/cm³

-50.8 °C

-34,5°C

Index of refraction: 1.895

insoluble H2O [MER06]

Selenium hexafluoride should be stored in a cool, fireproofbuilding withventilationalong the floor.

>1 atm

6.66

Nonflammable Gas

Prolonged exposure of the container to fire or intense heat may cause it to violently rupture or rocket.

Conversion: 1 ppm = 7.89 mg/cu m; hydrolyzes very slowly in cold water|Electron affinity: 2.9 eV|Heat of formation at 25 °C: -1029.3 kJ/mol|Polarizability: 7.33|For more Other Experimental Properties (Complete) data for SELENIUM HEXAFLUORIDE (8 total), please visit the HSDB record page.

Insoluble in water.

Non-Redox-Active Inorganic Compounds

SELENIUM HEXAFLUORIDE is a colorless, poison gas, when heated to decomposition it emits very toxic fumes containing metallic selenium and selenium fluorides [Lewis, 3rd ed., 1993, p. 1131].

Nonflammable Gas

Critical temperature = 345.5 K

2.3

2194

23/25-33-34

20/21-28-45

VS9450000

T

Fireproof if in building. Cool. Ventilation along the floor. Separated from food and feedstuffs.

Highly Toxic

P260, P264, P270, P271, P280, P284, P302+P352, P304+P340, P305+P351+P338, P307+P311, P310, P314, P320, P321, P332+P313, P362, P403+P233, P405, P410+P403, P501

H280

Generators of waste (equal to or greater than 100 kg/mo) containing this contaminant, EPA hazardous waste number D010, must conform with USEPA regulations in storage, transportation, treatment and disposal of waste.

Reacts with ammonia gas at 200 °C to give selenium, nitrogen, & hydrogen fluoride|Do not use metal and acid to reduce selenium compounds. This will produce toxic gaseous hydrogen selenide. /Selenium compounds/|Acids, strong oxidizers, chromium trioxide, potassium bromate. /Selenium/

US Dept of Interior/Fish & Wildlife Service Contaminant Reviews; Selenium Hazards to Fish, Wildlife, and Invertebrates: A Synoptic Review Biol Rept No (85)1.5 (1985)|WHO; Environmental Health Criteria 58: Selenium (1987). EHC are designed for scientists and administrators responsible for the establishment of safety standards and regulations and provide basic scientific risk evaluations of a wide range of chemicals and groups of chemicals.[Available from, as of April 1, 2011: http://www.inchem.org/documents/ehc/ehc/ehc58.htm#SectionNumber:7.1]

Excerpt from ERG Guide 125 [Gases - Corrosive]: Some may burn but none ignite readily. Vapors from liquefied gas are initially heavier than air and spread along ground. Some of these materials may react violently with water. Cylinders exposed to fire may vent and release toxic and/or corrosive gas through pressure relief devices. Containers may explode when heated. Ruptured cylinders may rocket. For UN1005: Anhydrous ammonia, at high concentrations in confined spaces, presents a flammability risk if a source of ignition is introduced. (ERG, 2016)|Not combustible. Gives off irritating or toxic fumes (or gases) in a fire.

|Danger|H280 (100%): Contains gas under pressure; may explode if heated [Warning Gases under pressure]|P260, P264, P271, P280, P284, P301+P330+P331, P303+P361+P353, P304+P340, P305+P351+P338, P310, P320, P321, P363, P403+P233, P405, P410+P403, and P501|Aggregated GHS information provided by 111 companies from 1 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.|H280: Contains gas under pressure; may explode if heated [Warning Gases under pressure]|P260, P264, P270, P271, P280, P284, P302+P352, P304+P340, P305+P351+P338, P307+P311, P310, P314, P320, P321, P332+P313, P362, P403+P233, P405, P410+P403, and P501

Excerpt from ERG Guide 125 [Gases - Corrosive]: As an immediate precautionary measure, isolate spill or leak area for at least 100 meters (330 feet) in all directions. SPILL: See ERG Table 1 - Initial Isolation and Protective Action Distances on the UN/NA 2194 datasheet. FIRE: If tank, rail car or tank truck is involved in a fire, ISOLATE for 1600 meters (1 mile) in all directions; also, consider initial evacuation for 1600 meters (1 mile) in all directions. (ERG, 2016)

Excerpt from ERG Guide 125 [Gases - Corrosive]: Fully encapsulating, vapor-protective clothing should be worn for spills and leaks with no fire. Do not touch or walk through spilled material. Stop leak if you can do it without risk. If possible, turn leaking containers so that gas escapes rather than liquid. Prevent entry into waterways, sewers, basements or confined areas. Do not direct water at spill or source of leak. Use water spray to reduce vapors or divert vapor cloud drift. Avoid allowing water runoff to contact spilled material. Isolate area until gas has dispersed. (ERG, 2016)

Skin: No recommendation is made specifying the need for personal protective equipment for the body. Eyes: No recommendation is made specifying the need for eye protection. Wash skin: No recommendation is made specifying the need for washing the substance from the skin (either immediately or at the end of the work shift). Remove: No recommendation is made specifying the need for removing clothing that becomes wet or contaminated. Change: No recommendation is made specifying the need for the worker to change clothing after the work shift. (NIOSH, 2016)|Respirator Recommendations: Up to 0.5 ppm: [Table#1963]|Respirator Recommendations: Up to 1.25 ppm: [Table#1964]|Respirator Recommendations: Up to 2 ppm: [Table#1965]|Respirator Recommendations: Emergency or planned entry into unknown concentrations or IDLH conditions: [Table#1966]|For more Personal Protective Equipment (PPE) (Complete) data for SELENIUM HEXAFLUORIDE (7 total), please visit the HSDB record page.|(See protection codes)

Prolonged exposure of the container to fire or intense heat may cause it to violently rupture or rocket.

If material on fire or involved in fire: Extinguish fire using agent suitable for type of surrounding fire. Material itself does not burn or burns with difficulty. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible. Use foam, dry chemical, or carbon dioxide. Do not apply water to point of leak in tank car or container. If fire becomes uncontrollable or container is exposed to direct flame, consider evacuation of one-third (1/3) mile radius.|Personnel protection: Wear positive pressure self-contained breathing apparatus when fighting fires involving this material. ... Wear appropriate chemical protective clothing.

SRP: Wastewater from contaminant suppression, cleaning of protective clothing/equipment, or contaminated sites should be contained and evaluated for subject chemical or decomposition product concentrations. Concentrations shall be lower than applicable environmental discharge or disposal criteria. Alternatively, pretreatment and/or discharge to a permitted wastewater treatment facility is acceptable only after review by the governing authority and assurance that "pass through" violations will not occur. Due consideration shall be given to remediation worker exposure (inhalation, dermal and ingestion) as well as fate during treatment, transfer and disposal. If it is not practicable to manage the chemical in this fashion, it must be evaluated in accordance with EPA 40 CFR Part 261, specifically Subpart B, in order to determine the appropriate local, state and federal requirements for disposal.|If selenium hexafluoride is leaked, the following steps should be taken: 1. Ventilate area of leak. 2. Stop flow of gas. If source of leak is a cylinder and the leak cannot be stopped in place, remove the leaking cylinder to a safe place in the open air, and repair the leak or allow the cylinder to empty.

Personnel protection: Avoid breathing vapors. Keep upwind. Avoid bodily contact with the material. Wash away any material which may have contacted the body with copious amounts of water or soap and water.|If material not on fire and not involved in fire: Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Attempt to stop leak if without undue personnel hazard. Use water spray to knock-down vapors. If material leaking (not on fire) consider evacuation from downwind area based on amount of material spilled, location and weather conditions.|Hot Zone Rescuers should be trained and appropriately attired before entering the Hot Zone. If the proper equipment is not available, or ifrescuers have not been trained in its use, assistance should be obtained from a local or regional HAZMAT team or other properly equipped response organization.|Skin Protection: Chemical-protective clothing is recommended because selenium hexafluoride can cause skin irritation and burns. Fully encapsulating, vapor protective clothingshould bewornto deal with spills or leaks with no fire.|For more Preventive Measures (Complete) data for SELENIUM HEXAFLUORIDE (11 total), please visit the HSDB record page.

If ... THERE IS NO FIRE, go directly to the Table of Initial Isolation and Protective Action Distances /(see table below)/ ... to obtain initial isolation and protective action distances. IF THERE IS A FIRE, or IF A FIRE IS INVOLVED, go directly to the appropriate guide /(see guide(s) below)/ and use the evacuation information shown under PUBLIC SAFETY. /Selenium hexafluoride/|/GUIDE 125: GASES - CORROSIVE/ Health: TOXIC; may be fatal if inhaled, ingested or absorbed through skin. Vapors are extremely irritating and corrosive. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control may cause pollution.|/GUIDE 125: GASES - CORROSIVE/ Fire or Explosion: Some may burn, but none ignite readily. Vapors from liquefied gas are initially heavier than air and spread along ground. Some of these materials may react violently with water. Cylinders exposed to fire may vent and release toxic and/or corrosive gas through pressure relief devices. Containers may explode when heated. Ruptured cylinders may rocket.|/GUIDE 125: GASES - CORROSIVE/ Public Safety: CALL Emergency Response Telephone Number ... As an immediate precautionary measure, isolate spill or leak area for at least 100 meters (330 feet) in all directions. Keep unauthorized personnel away. Stay upwind. Many gases are heavier than air and will spread along ground and collect in low or confined areas (sewers, basements, tanks). Keep out of low areas. Ventilate closed spaces before entering.|For more DOT Emergency Guidelines (Complete) data for SELENIUM HEXAFLUORIDE (9 total), please visit the HSDB record page.

No person may /transport,/ offer or accept a hazardous material for transportation in commerce unless that person is registered in conformance ... and the hazardous material is properly classed, described, packaged, marked, labeled, and in condition for shipment as required or authorized by ... /the hazardous materials regulations (49 CFR 171-177)./|The International Air Transport Association (IATA) Dangerous Goods Regulations are published by the IATA Dangerous Goods Board pursuant to IATA Resolutions 618 and 619 and constitute a manual of industry carrier regulations to be followed by all IATA Member airlines when transporting hazardous materials.|The International Maritime Dangerous Goods Code lays down basic principles for transporting hazardous chemicals. Detailed recommendations for individual substances and a number of recommendations for good practice are included in the classes dealing with such substances. A general index of technical names has also been compiled. This index should always be consulted when attempting to locate the appropriate procedures to be used when shipping any substance or article.

Selenium hexafluoride produces irritation of the respiratory tract, and can lead to pulmonary edema and death.|Selenium hexafluoride is a skin irritant. Contact with the liquified gas may cause burns, severe injury or frostbite.|Selenium hexafluoride gas can cause eye irritation and damage to the cornea, exposure to the liquified gas can cause severe damage or blindness.|... Irritation of mucous membranes of eyes, throat & lung, and skin damage ...

Permissible Exposure Limit: 8 hr Time Weighted Avg: 0.05 ppm (0.4 mg/cu m), as Se.

Recommended Exposure Limit: 10 Hr Time-Weighted Avg: 0.05 ppm

Evacuate danger area! Consult an expert! Ventilation. NEVER direct water jet on liquid. Personal protection: gas-tight chemical protection suit including self-contained breathing apparatus. Do NOT let this chemical enter the environment.

Fireproof if in building. Cool. Ventilation along the floor. Separated from food and feedstuffs.

A harmful concentration of this gas in the air will be reached very quickly on loss of containment.

Corrosive. The substance is corrosive to the eyes and respiratory tract. Inhalation of this gas may cause lung oedema. Rapid evaporation of the liquid may cause frostbite.

STRICT HYGIENE! IN ALL CASES CONSULT A DOCTOR!

Use ventilation, local exhaust or breathing protection.

Protective gloves. Cold-insulating gloves.

Wear face shield or eye protection in combination with breathing protection.

Listed as a hazardous air pollutant (HAP) generally known or suspected to cause serious health problems. The Clean Air Act, as amended in 1990, directs EPA to set standards requiring major sources to sharply reduce routine emissions of toxic pollutants. EPA is required to establish and phase in specific performance based standards for all air emission sources that emit one or more of the listed pollutants. Selenium hexafluoride is included on this list.

Selenium hexafluoride is a corrosive, colorless gas at room temperature. Selenium hexafluoride is only slightly soluble in water. It does not occur naturally in the environment.Selenium hexafluoride is used as a gaseous electrical insulator.

D010; A waste containing selenium (such as selenium hexafluoride) may or may not be characterized a hazardous waste following testing by the Toxicity Characteristic Leaching Procedure as prescribed by the Resource Conservation and Recovery Act (RCRA) regulations.[40 CFR 261.24 (USEPA); U.S. National Archives and Records Administration's Electronic Code of Federal Regulations. Available from, as of March 8, 2011: http://www.ecfr.gov]

D010; A solid waste containing selenium (such as selenium hexafluoride) may become characterized as a hazardous waste when subjected to the Toxicity Characteristic Leaching Procedure listed in 40 CFR 261.24, and if so characterized, must be managed as a hazardous waste.

Selenium hexafluoride can affect the body if it is inhaled or if it comes in contact with the eyes or skin.|Highly toxic by inhalation.|The following list includes some common operations in which exposure to selenium hexafluoride may occur: 1) Use as a gaseous electric insulator, 2) use during production of selenium hydroxide and hydrofluoric acid, selenium and nitrogen.

Food and Environmental Agents: Effect on Breast-Feeding: Reported Sign or Symptom in Infant or Effect on Lactation: Fluorides: None. /from Table 7/

Selenium hexafluoride may trigger electrolyte imbalance similar to that elicited by hydrogen fluoride, since selenium hexafluoride readily decomposes to selenium and hydrogen fluoride upon contact with moisture.

Excerpt from ERG Guide 125 [Gases - Corrosive]: TOXIC; may be fatal if inhaled, ingested or absorbed through skin. Vapors are extremely irritating and corrosive. Contact with gas or liquefied gas may cause burns, severe injury and/or frostbite. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control may cause pollution. (ERG, 2016)

Breathing: If a person breathes large amounts of this chemical, move the exposed person to fresh air at once. If breathing has stopped, perform mouth-to-mouth resuscitation. Keep the affected person warm and at rest. Get medical attention as soon as possible. (NIOSH, 2016)|(See procedures)

Fresh air, rest. Half-upright position. Artificial respiration may be needed. Refer for medical attention.

ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Rinse skin with plenty of water or shower. Refer for medical attention .

First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.

Immediate first aid: Ensure that adequate decontamination has been carried out. If patient is not breathing, start artificial respiration, preferably with a demand-valve resuscitator, bag-valve-mask device, or pocket mask, as trained. Perform CPR as necessary. Immediately flush contaminated eyes with gently flowing water. Do not induce vomiting. If vomiting occurs, lean patient forward or place on left side (head-down position, if possible) to maintain an open airway and prevent aspiration. Keep patient quiet and maintain normal body temperature. Obtain medical attention. /Selenium and Related Compounds/|Basic treatment: Establish a patent airway (oropharyngeal or nasopharyngeal airway, if needed). Suction if necessary. Watch for signs of respiratory insufficiency and assist ventilations if necessary. Administer oxygen by nonrebreather mask at 10 to 15 L/min. Monitor for shock and treat if necessary ... . Monitor for pulmonary edema and treat if necessary ... . Treat seizures if necessary ... . For eye contamination, flush eyes immediately with water. Irrigate each eye continuously with 0.9% saline (NS) during transport ... . Do not use emetics. For ingestion, rinse mouth and administer 5 ml/kg up to 200 ml of water for dilution if the patient can swallow, has a strong gag reflex, and does not drool. Administer activated charcoal ... . /Selenium and Related Compounds/|Advanced treatment: Consider orotracheal or nasotracheal intubation for airway control in the patient who is unconscious, has severe pulmonary edema, or is in severe respiratory distress. Positive-pressure ventilation techniques with a bag valve mask device may be beneficial. Consider drug therapy for pulmonary edema ... . Consider administering a beta agonist such as albuterol for severe bronchospasm ... .Monitor cardiac rhythm and treat arrhythmias if necessary ... . Start IV administration of D5W /SRP: "To keep open", minimal flow rate/. Use 0.9% saline (NS) or lactated Ringer's (LR) if signs of hypovolemia are present. For hypotension with signs of hypovolemia, administer fluid cautiously. Consider vasopressors if patient is hypotensive with a normal fluid volume. Watch for signs of fluid overload ... . Treat seizures with diazepam or lorazepam ... . Use proparacaine hydrochloride to assist eye irrigation ... . /Selenium and Related Compounds/|Immediate first aid: Ensure that adequate decontamination has been carried out. If patient is not breathing, start artificial respiration, preferably with a demand-valve resuscitator, bag-valve-mask device, or pocket mask, as trained. Perform CPR as necessary. Immediately flush contaminated eyes with gently flowing water. Do not induce vomiting. If vomiting occurs, lean patient forward or place on left side (head-down position, if possible) to maintain an open airway and prevent aspiration. Keep patient quiet and maintain normal body temperature. Obtain medical attention. /Fluorine and related compounds/|For more Antidote and Emergency Treatment (Complete) data for SELENIUM HEXAFLUORIDE (11 total), please visit the HSDB record page.

/SIGNS AND SYMPTOMS/ Repeated contact with low concentrations of selenium hexafluoride may cause dermatitis, systemic toxicity characteristic of chronic selenium exposure, or fluorosis, a degenerative bone condition. Chronic exposure maybe more serious for children because of their potential longer latency period.|/SIGNS AND SYMPTOMS/ Tissue damage may be permanent; damage to the eyes may cause blindness. Exposure to selenium hexafluoride may result in electrolyte imbalance. Selenium hexafluoride may trigger electrolyte imbalance similar to that elicited by hydrogen fluoride, since selenium hexafluoride readily decomposes to selenium and hydrogen fluoride upon contact with moisture.|/SIGNS AND SYMPTOMS/ Selenium hexafluoride gas can cause eye irritation and damage to the cornea, exposure to the liquified gas can cause severe damage or blindness. Damage to the eyes is progressive while any unneutralized fluoride ion remains.|/SIGNS AND SYMPTOMS/ Selenium hexafluoride is a skin irritant. Contact with the liquified gas may cause burns, severe injury or frostbite. Burns are progressive while any unneutralized fluoride ion remains.|For more Human Toxicity Excerpts (Complete) data for SELENIUM HEXAFLUORIDE (6 total), please visit the HSDB record page.

The substance can be absorbed into the body by inhalation.|inhalation

In Animals: pulmonary irritation, edema

Cough. Sore throat. Headache. Nausea. Shortness of breath. Burning sensation.

Redness. Pain. ON CONTACT WITH LIQUID: FROSTBITE.

Redness. Pain. Blurred vision. Severe deep burns.

Death, Dermal (Skin), Ocular (Eyes), Respiratory (From the Nose to the Lungs)|respiratory system

Chemical Classes -> Inorganic substances