selenium hexafluoride

H280 (100%): Contains gas under pressure; may explode if heated [Warning Gases under pressure]

H314 (100%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]

H330 (100%): Fatal if inhaled [Danger Acute toxicity, inhalation]

P260, P264, P271, P280, P284, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P320, P321, P363, P403+P233, P405, P410+P403, and P501 (click each P-code to see the statement)

Aggregated GHS information provided per 111 reports by companies from 1 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.

Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website.

H280: Contains gas under pressure; may explode if heated [Warning Gases under pressure]

H315: Causes skin irritation [Warning Skin corrosion/irritation]

H318: Causes serious eye damage [Danger Serious eye damage/eye irritation]

H330: Fatal if inhaled [Danger Acute toxicity, inhalation]

H370: Causes damage to organs [Danger Specific target organ toxicity, single exposure]

H372: Causes damage to organs through prolonged or repeated exposure [Danger Specific target organ toxicity, repeated exposure]

P260, P264, P264+P265, P270, P271, P280, P284, P302+P352, P304+P340, P305+P354+P338, P308+P316, P316, P317, P319, P320, P321, P332+P317, P362+P364, P403+P233, P405, P410+P403, and P501 (click each P-code to see the statement)

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.

Excerpt from NIOSH Pocket Guide for Selenium hexafluoride:

Breathing: RESPIRATORY SUPPORT - If a person breathes large amounts of this chemical, move the exposed person to fresh air at once. If breathing has stopped, perform artificial respiration. Keep the affected person warm and at rest. Get medical attention as soon as possible. (NIOSH, 2024)

General First Aid:

· Call 911 or emergency medical service.

· Ensure that medical personnel are aware of the material(s) involved, take precautions to protect themselves and avoid contamination.

· Move victim to fresh air if it can be done safely.

· Administer oxygen if breathing is difficult.

· If victim is not breathing:

-- DO NOT perform mouth-to-mouth resuscitation; the victim may have ingested or inhaled the substance.

-- If equipped and pulse detected, wash face and mouth, then give artificial respiration using a proper respiratory medical device (bag-valve mask, pocket mask equipped with a one-way valve or other device).

-- If no pulse detected or no respiratory medical device available, provide continuous compressions. Conduct a pulse check every two minutes or monitor for any signs of spontaneous respirations.

· Remove and isolate contaminated clothing and shoes.

· For minor skin contact, avoid spreading material on unaffected skin.

· In case of contact with substance, remove immediately by flushing skin or eyes with running water for at least 20 minutes.

· For severe burns, immediate medical attention is required.

· Effects of exposure (inhalation, ingestion, or skin contact) to substance may be delayed.

· Keep victim calm and warm.

· Keep victim under observation.

· For further assistance, contact your local Poison Control Center.

· Note: Basic Life Support (BLS) and Advanced Life Support (ALS) should be done by trained professionals.

Specific First Aid:

· In case of contact with liquefied gas, only medical personnel should attempt thawing frosted parts.

· In case of skin contact with hydrogen fluoride, anhydrous (UN1052), if calcium gluconate gel is available, rinse 5 minutes, then apply gel. Otherwise, continue rinsing until medical treatment is available.

In Canada, an Emergency Response Assistance Plan (ERAP) may be required for this product. Please consult the shipping paper and/or the "ERAP" section.

(General first aid procedures)

Breathing: Respiratory support

Excerpt from ERG Guide 125 [Gases - Toxic and/or Corrosive]:

SMALL FIRE: Dry chemical or CO2.

LARGE FIRE: Water spray, fog or regular foam. If it can be done safely, move undamaged containers away from the area around the fire. Do not get water inside containers. Damaged cylinders should be handled only by specialists.

FIRE INVOLVING TANKS: Fight fire from maximum distance or use unmanned master stream devices or monitor nozzles. Cool containers with flooding quantities of water until well after fire is out. Do not direct water at source of leak or safety devices; icing may occur. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks in direct contact with flames. (ERG, 2024)

In case of fire in the surroundings, use appropriate extinguishing media. In case of fire: keep drums, etc., cool by spraying with water.

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.

· CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.

· Keep unauthorized personnel away.

· Stay upwind, uphill and/or upstream.

· Many gases are heavier than air and will spread along the ground and collect in low or confined areas (sewers, basements, tanks, etc.).

· Ventilate closed spaces before entering, but only if properly trained and equipped.

· 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.

Excerpt from ERG Guide 125 [Gases - Toxic and/or Corrosive]:

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 tank car or highway tank 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, 2024)

Immediate precautionary measure

· Isolate spill or leak area for at least 100 meters (330 feet) in all directions.

· For highlighted materials: see Table 1 - Initial Isolation and Protective Action Distances.

· For non-highlighted materials: increase the immediate precautionary measure distance, in the downwind direction, as necessary.

· If tank, rail tank car or highway tank 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.

Small spill:

- ISOLATE in all directions: 200 m (600 ft)

Large spill:

- ISOLATE in all directions: 600 m (2000 ft)

- PROTECT people from downwind during DAY time: 1.1 km (0.7 mi)

- PROTECT people from downwind during NIGHT time: 3.4 km (2.1 mi)

- PROTECT people from downwind during DAY time: 3.9 km (2.4 mi)

- PROTECT people from downwind during NIGHT time: 7.6 km (4.8 mi)

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.

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.

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.

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.

Excerpt from ERG Guide 125 [Gases - Toxic and/or Corrosive]:

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, 2024)

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

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

· Wear positive pressure self-contained breathing apparatus (SCBA).

· Wear chemical protective clothing that is specifically recommended by the manufacturer when there is NO RISK OF FIRE.

· Structural firefighters' protective clothing provides thermal protection but only limited chemical protection.

Biological Exposure Indices (BEI) [ACGIH] - Fluorides in urine = 2 mg/L prior to shift or 3 mg/L at end of shift; (Repeated measurements recommended.)

TIH (Toxic Inhalation Hazard) - Term used to describe gases and volatile liquids that are toxic when inhaled. Some are TIH materials themselves, e.g., chlorine, and some release TIH gases when spilled in water, e.g., chlorosilanes. [ERG 2016].

1.0 [mg/m3], inhalable fraction, as F[German Research Foundation (DFG)]

AEGL 1: Notable discomfort, irritation, or certain asymptomatic non-sensory effects. However, the effects are not disabling and are transient and reversible upon cessation of exposure (Unit: ppm)

AEGL 2: Irreversible or other serious, long-lasting adverse health effects or an impaired ability to escape (Unit: ppm)

AEGL 3: Life-threatening health effects or death (Unit: ppm)

AEGLs Status: Interim

0.053 [ppm]

0.087 [ppm]

0.26 [ppm]

0.05 ppm

TWA 0.05 ppm

0.4 [mg/m3], as Se (2.5 mg/m3, as F)

0.05 ppm (0.4 mg/m³)

TWA 0.05 ppm (0.4 mg/m3)

2 ppm (NIOSH, 2024)

15.8 [mg/m3]

Excerpts from Documentation for IDLHs: Other animal data: It has been reported that 5 ppm for 4 hours resulted in pulmonary edema from which rabbits, guinea pigs, rats, and mice survived [Kimmerle 1960].

See: 7783791

0.16 [mg/m3], as Se (2.5 mg/m3, as F)

8 hr Time Weighted Avg (TWA): 0.05 ppm.

Excursion Limit Recommendation: Excursions in worker exposure levels may exceed 3 times the TLV-TWA for no more than a total of 30 minutes during a work day, and under no circumstances should they exceed 5 times the TLV-TWA, provided that the TLV-TWA is not exceeded.

0.2 mg/m

0.05 ppm [1992]

(as Se, inhalable fraction): 0.02 mg/m

Chronic Oral: 0.005 mg/kg/day (L134)

Small Fire

· Dry chemical or CO2.

Large Fire

· Water spray, fog or regular foam.

· If it can be done safely, move undamaged containers away from the area around the fire.

· Do not get water inside containers.

· Damaged cylinders should be handled only by specialists.

Fire Involving Tanks

· Fight fire from maximum distance or use unmanned master stream devices or monitor nozzles.

· Cool containers with flooding quantities of water until well after fire is out.

· Do not direct water at source of leak or safety devices; icing may occur.

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.

Colorless liquefied gas under pressure; [ICSC]

COLOURLESS COMPRESSED LIQUEFIED GAS.

Colorless gas.

Colorless gas; white solid at low temperature

-30 °F at 760 mmHg (NIOSH, 2024)

-34.5 °C

-59 °F (NIOSH, 2024)

-50.8 °C

Insoluble (NIOSH, 2024)

Insoluble in water

Solubility in water: slow reaction

Insoluble

7.887 g/L

7.887 @25 °C

6.66(relative gas density)

6.66 (NIOSH, 2024) - Heavier than air; will sink (Relative to Air)

6.66 (Air = 1)

Relative vapor density (air = 1): 6.7

greater than 1 atm (NIOSH, 2024)

651.2 mm Hg at -48.7 °C; 213.1 mm Hg at -64.8 °C; 30.4 mm Hg at -87.5 °C

750 [mm Hg] @-46.5 °C

Decomposes when dissolved in water.

Water [Note: Hydrolyzes very slowly in cold water].

When heated to decomposition ... emits very toxic fumes of /hydrogen fluoride and selenium/.

Index of refraction: 1.895

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.

phonon wavenumber

crystal structure

enthalpy

Gibbs energy

spin-spin coupling constant

partial pressure

unit cell parameter

melting temperature

heat capacity

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].

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/

Water [Note: Hydrolyzes very slowly in cold water.]

Selenium readily substitutes for sulfur in biomolecules and in many biochemical reactions, especially when the concentration of selenium is high and the concentration of sulfur is low. Inactivation of the sulfhydryl enzymes necessary for oxidative reactions in cellular respiration, through effects on mitochondrial and microsomal electron transport, might contribute to acute selenium toxicity. Selenomethionine (a common organic selenium compound) also appears to randomly substitute for methionine in protein synthesis. This substitution may affect the structure and functionability of the protein, for example, by altering disulfide bridges. Inorganic forms of selenium appear to react with tissue thiols by redox catalysis, resulting in formation of reactive oxygen species and causing damage by oxidative stress. (L619)

3, not classifiable as to its carcinogenicity to humans. (L135)

Chronic oral exposure to high concentrations of selenium compounds can produce a disease called selenosis. The major signs of selenosis are hair loss, nail brittleness, and neurological abnormalities (such as numbness and other odd sensations in the extremities). Animal studies have shown that selenium may also affect sperm production and the female reproductive cycle. (L619)

The substance can be absorbed into the body by inhalation.

inhalation

Oral (L619) ; inhalation (L619) ; dermal (L619)

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

Redness. Pain. ON CONTACT WITH LIQUID: FROSTBITE.

Redness. Pain. Blurred vision. Severe deep burns.

In Animals: pulmonary irritation, edema

Short-term oral exposure to high concentrations of selenium may cause nausea, vomiting, and diarrhea. Brief exposures to high levels of elemental selenium or selenium dioxide in air can result in respiratory tract irritation, bronchitis, difficulty breathing, and stomach pains. Longer-term exposure to either of these air-borne forms can cause respiratory irritation, bronchial spasms, and coughing. (L619)

respiratory system

Neurotoxin - Other CNS neurotoxin

Occupational hepatotoxin - Secondary hepatotoxins: the potential for toxic effect in the occupational setting is based on cases of poisoning by human ingestion or animal experimentation.

Reproductive Toxin - A chemical that is toxic to the reproductive system, including defects in the progeny and injury to male or female reproductive function. Reproductive toxicity includes developmental effects. See Guidelines for Reproductive Toxicity Risk Assessment.

Dermatotoxin - Skin burns.

Toxic Pneumonitis - Inflammation of the lungs induced by inhalation of metal fumes or toxic gases and vapors.

LCLo (rat) = 10 ppm/1H

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.

The following medical procedures should be made available to each employee who is exposed to selenium hexafluoride at potentially hazardous levels: 1. Initial Medical Examination: a) A complete history and physical examination: The purpose is to detect ... existing conditions that might place the exposed employee at increased risk, and to establish a baseline for future health monitoring. Examination of the respiratory tract should be stressed. b) 14" x 17" chest roentgenogram: Selenium hexafluoride causes lung damage in animals. Surveillance of the lungs is indicated. c) FVC and FEV (1 sec): Selenium hexafluoride is a severe pulmonary irritant in animals. Persons with impaired pulmonary function may be at increased risk from exposure. Periodic surveillance is indicated. 2. Periodic Medical Examination: The aforementioned medical examinations should be repeated on an annual basis, except that an x-ray is necessary only when indicated by the results of pulmonary function testing, or when signs and symptoms of respiratory disease occur.

/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.

/LABORATORY ANIMALS: Acute Exposure/ Acute /inhalation/ studies on the toxicity of selenium hexafluoride (SeF6), were carried out on the rabbit, guinea-pig, rat, and mouse at 100, 50, 25, 10, 5, and 1 ppm for 4 hr. Exposures down to and including 10 ppm (Ct = 40 ppm/hr) were uniformly fatal. Exposure to 5 ppm (Ct = 20 ppm/hr) resulted in pulmonary edema from which the animals recovered, and 1 ppm did not induce any grossly observable effects. However, with repeated exposure for 1 hr daily at 5 ppm, for 5 days, there were definite signs of pulmonary injury.

/LABORATORY ANIMALS: Acute Exposure/ The acute toxicity of selenium hexfluoride /is/ ... about one-half that of ozone (Ct = 25 ppm-hr, represents an LC50 for small laboratory rodents).

The substance is harmful to aquatic organisms.

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.

The substance is harmful to aquatic organisms.

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.

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.

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/

Table: Table of Initial Isolation and Protective Action Distances for Selenium hexafluoride [Table#1960]

/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.

UN 2194; Selenium hexafluoride

IMO 2.3; Selenium hexafluoride

49 209 15; Selenium hexafluoride

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.

Poison Gas Corrosive

Symbol: T, N; R: 23/25-33-50/53; S: (1/2)-20/21-28-45-60-61; Note: A

UN Hazard Class: 2.3; UN Subsidiary Risks: 8