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i

1

2 

3

4

5

6

7 IMMEDIATELY DANGEROUS TO LIFE OR HEALTH (IDLH) VALUE PROFILE 

8

9

10

11 FOR 

12

13

14

15 CHLORINE PENTAFLUORIDE [CAS NO. 13637-63-3] 

16

17 AND

18

19 BROMINE PENTAFLUORIDE [CAS NO. 7789-30-2] 

20

21

22

23

24

25

26 Department of Health and Human Services 

27 Centers for Disease Control and Prevention 

28 National Institute for Occupational Safety and Health 
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ii

1 DISCLAIMER

2 Mention of any company or product does not constitute endorsement by the National Institute for Occupational 

3 Safety and Health (NIOSH). In addition, citations of Web sites external to NIOSH do not constitute NIOSH 

4 endorsement of the sponsoring organizations or their programs or products. Furthermore, NIOSH is not 

5 responsible for the content of these Web sites. 

6

7 ORDERING INFORMATION

8 This document is in the public domain and may be freely copied or reprinted. To receive NIOSH documents or 

9 other information about occupational safety and health topics, contact NIOSH at 

10 Telephone: 1-800-CDC-INFO (1-800-232-4636) 

11 TTY: 1-888-232-6348 

12 E-mail: cdcinfo@cdc.gov 

13

14 or visit the NIOSH Web site at www.cdc.gov/niosh. 

15

16
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iii

1 Foreword 

2 Chemicals are a ubiquitous component of the modern workplace. Occupational exposures to chemicals have the 

3 potential to adversely affect the health and lives of workers. Acute or short-term exposures to high concentrations 

4 of some airborne chemicals have the ability to quickly overwhelm workers, resulting in a spectrum of undesirable 

5 health outcomes that may inhibit the ability to escape from the exposure environment (e.g., irritation of the eyes 

6 and respiratory tract or cognitive impairment), cause severe irreversible effects (e.g., damage to the respiratory 

7 tract or reproductive toxicity), and in extreme cases, cause death. Airborne concentrations of chemicals capable 

8 of causing such adverse health effects or of impeding escape from high-risk conditions may arise from a variety of 

9 non-routine workplace situations , including special work procedures (e.g., in confined spaces), industrial 

10 accidents (e.g., chemical spills or explosions), and chemical releases into the community (e.g., during 

11 transportation incidents or other uncontrolled-release scenarios). 

12

13 The “immediately dangerous to life or health air concentration values (IDLH values)” developed by the National 

14 Institute for Occupational Safety and Health (NIOSH) characterize these high-risk exposure concentrations and 

15 conditions [NIOSH 2013]. IDLH values are based on a 30-minute exposure duration and have traditionally 

16 served as a key component of the decision logic for the selection of respiratory protection devices [NIOSH 2004]. 

17 Occupational health professionals have employed these values beyond their initial purpose as a component of the 

18 NIOSH Respirator Selection Logic to assist in developing Risk Management Plans for non-routine work practices 

19 governing operations in high-risk environments (e.g., confined spaces) and the development of Emergency 

20 Preparedness Plans. 

21

22 The approach used to derive IDLH values for high priority chemicals is outlined in the NIOSH Current 

23 Intelligence Bulletin (CIB) 66: Derivation of Immediately Dangerous to Life or Health Values [NIOSH 2013]. 

24 CIB 66 provides 1) an update on the scientific basis and risk assessment methodology used to derive IDLH 

25 values, 2) the rationale and derivation process for IDLH values, and 3) a demonstration of the derivation of 

26 scientifically credible IDLH values using available data resources. 

27

28 The purpose of this technical report is to present the IDLH values for chlorine pentafluoride (CAS # 13637-63-3) 

29 and bromine pentafluoride (CAS #7789-30-2). The scientific basis, toxicologic data and risk assessment 

30 approach used to derive the IDLH value are summarized to ensure transparency and scientific credibility. 

31 

32 John Howard, M.D. 

33 Director 

34 National Institute for Occupational Safety and Health 

35 Centers for Disease Control and Prevention
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iv

1 Contents

2 FOREWORD ................................................................................................................................................................ III

3 ABBREVIATIONS ........................................................................................................................................................V

4 GLOSSARY ..................................................................................................................................................................VI

5 ACKNOWLEDGMENTS .............................................................................................................................................IX

6 1.0 CHLORINE PENTAFLUORIDE...................................................................................................................... 1

7 1.1 INTRODUCTION ...........................................................................................................................................................1

8 1.1.1 Overview of the IDLH Value for Chlorine Pentafluoride..................................................................................1

9 1.1.2 Purpose..............................................................................................................................................................1

10 1.1.3 General Substance Information.........................................................................................................................1

11 1.2 ANIMAL TOXICITY DATA............................................................................................................................................4

12 1.3 HUMAN DATA.............................................................................................................................................................7

13 1.4 SUMMARY...................................................................................................................................................................7

14 2.0 BROMINE PENTAFLUORIDE........................................................................................................................ 8

15 2.1 INTRODUCTION ...........................................................................................................................................................8

16 2.1.1 Overview of the IDLH Value for Bromine Pentafluoride ..................................................................................8

17 2.1.2 Purpose..............................................................................................................................................................8

18 2.1.3 General Substance Information.........................................................................................................................9

19 2.2 ANIMAL TOXICITY DATA..........................................................................................................................................12

20 2.3 HUMAN DATA...........................................................................................................................................................13

21 2.4 SUMMARY.................................................................................................................................................................13

22 3.0 REFERENCES ................................................................................................................................................ 14

23

24

25

26

27
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v

1 Abbreviations 

2

3 ACGIH American Conference of Governmental Industrial Hygienists 

4 AEGL Acute Exposure Guideline Levels 

5 AIHA American Industrial Hygiene Association 

6 BMC benchmark concentration 

7 BMCL benchmark concentration lower confidence limit 

8 BrF5 bromine pentafluoride

9 C° Celsius 

10 C ceiling 

11 CAS chemical abstract service 

12 ClF5 chlorine pentafluoride

13 ERPG Emergency Response Planning Guidelines 

14 IDLH immediately dangerous to life or health 

15 LC50 median lethal concentration 

16 LCLo lowest concentration of a chemical that caused death in humans or animals 

17 LEL lower explosive limit 

18 LOAEL lowest observed adverse effect level 

mg/m3 19 milligram(s) per cubic meter 

20 mmHg millimeter(s) of mercury 

21 NAC National Advisory Committee 

22 NAS National Academy of Sciences 

23 NIOSH National Institute for Occupational Safety and Health 

24 NOAEL no observed adverse effect level 

25 OSHA Occupational Safety and Health Administration 

26 PEL permissible exposure limit 

27 ppm parts per million 

28 RD50 concentration of a chemical in the air that is estimated to cause a 50% decrease in the respiratory 

29 rate 

30 REL recommend exposure limit 

31 SCP Standard Completion Program 

32 STEL short term exposure limit 

33 TLV threshold limit value 

34 TWA time weighted average 

35 UEL upper explosive limit 

36 WEEL workplace environmental exposure level 
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vi

1 Glossary 

2

3 Acute Exposure: Exposure by the oral, dermal, or inhalation route for 24 hours or less. 

4 Acute Exposure Guideline Levels (AEGLs): Threshold exposure limits for the general public applicable to 

5 emergency exposure periods ranging from 10 minutes to 8 hours. AEGL-1, AEGL 2, and AEGL-3 are 

6 developed for five exposure periods (10 and 30 minutes, 1 hour, 4 hours, and 8 hours) and are distinguished 

7 by varying degrees of severity of toxic effects ranging from transient, reversible effects to life-threatening 

8 effects [NAS 2001]. AEGLs are intended to be guideline levels used during rare events or single once-in-a9 lifetime exposures to airborne concentrations of acutely toxic, high-priority chemicals [NAS 2001]. The 

10 threshold exposure limits are designed to protect the general population, including the elderly, children or 

11 other potentially sensitive groups that are generally not considered in the development of workplace exposure 

12 recommendations (additional information available at http://www.epa.gov/oppt/aegl/). 

13 Acute Reference Concentration (RfC): An estimate (with uncertainty spanning perhaps an order of magnitude) 

14 of a continuous inhalation exposure for an acute duration (24 hours or less) of the human population 

15 (including sensitive subgroups) that is likely to be without an appreciable risk of deleterious effects during a 

16 lifetime. It can be derived from a NOAEL, LOAEL, or benchmark concentration, with uncertainty factors 

17 (UFs) generally applied to reflect limitations of the data used. Generally used in USEPA noncancer health 

18 assessments [USEPA 2014]. 

19 Acute Toxicity: Any poisonous effect produced within a short period of time following an exposure, usually 24 

20 to 96 hours. 

21 Adverse Effect: A substance-related biochemical change, functional impairment, or pathologic lesion that affects 

22 the performance of an organ or system or alters the ability to respond to additional environmental challenges. 

23 Benchmark Dose/Concentration (BMD/BMC): A dose or concentration that produces a predetermined change 

24 in response rate of an effect (called the benchmark response, or BMR) compared to background [USEPA 

25 2014] (additional information available at http://www.epa.gov/ncea/bmds/). 

26 Benchmark Response (BMR): A predetermined change in response rate of an effect. Common defaults for the 

27 BMR are 10% or 5%, reflecting study design, data variability, and sensitivity limits used. 

28 BMCL: A statistical lower confidence limit on the concentration at the BMC [USEPA 2014]. 

29 Bolus Exposure: A single, relatively large dose. 

30 Ceiling Value (“C”): U.S. term in occupational exposure indicating the airborne concentration of a potentially 

31 toxic substance that should never be exceeded in a worker’s breathing zone. 

32 Chronic Exposure: Repeated exposure for an extended period of time. Typically exposures are more than 

33 approximately 10% of life span for humans and >90 days to 2 years for laboratory species. 

34 Critical Study: The study that contributes most significantly to the qualitative and quantitative assessment of risk 

35 [USEPA 2014]. 

36

37 Dose: The amount of a substance available for interactions with metabolic processes or biologically significant 

38 receptors after crossing the outer boundary of an organism [USEPA 2014]. 

39 ECt50: A combination of the effective concentration of a substance in the air and the exposure duration that is 

40 predicted to cause an effect in 50% (one half) of the experimental test subjects. 
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vii

1 Emergency Response Planning Guidelines (ERPGs): Maximum airborne concentrations below which nearly all 

2 individuals can be exposed without experiencing health effects for 1-hour exposure. ERPGs are presented in a 

3 tiered fashion with health effects ranging from mild or transient to serious, irreversible, or life threatening 

4 (depending on the tier). ERPGs are developed by the American Industrial Hygiene Association [AIHA 2006]. 

5 Endpoint: An observable or measurable biological event or sign of toxicity ranging from biomarkers of initial 

6 response to gross manifestations of clinical toxicity. 

7 Exposure: Contact made between a chemical, physical, or biological agent and the outer boundary of an 

8 organism. Exposure is quantified as the amount of an agent available at the exchange boundaries of the 

9 organism (e.g., skin, lungs, gut). 

10 Extrapolation: An estimate of the response at a point outside the range of the experimental data, generally 

11 through the use of a mathematical model, although qualitative extrapolation may also be conducted. The 

12 model may then be used to extrapolate to response levels that cannot be directly observed. 

13 Hazard: A potential source of harm. Hazard is distinguished from risk, which is the probability of harm under 

14 specific exposure conditions. 

15 Immediately Dangerous to Life or Health (IDLH) condition: A situation that poses a threat of exposure to 

16 airborne contaminants when that exposure is likely to cause death or immediate or delayed permanent adverse 

17 health effects or prevent escape from such an environment [NIOSH 2004, 2013]. 

18 IDLH value: A maximum (airborne concentration) level above which only a highly reliable breathing apparatus 

19 providing maximum worker protection is permitted [NIOSH 2004, 2013]. IDLH values are based on a 30-

20 minute exposure duration. 

21 LC01: The statistically determined concentration of a substance in the air that is estimated to cause death in 1% of 

22 the test animals. 

23 LC50: The statistically determined concentration of a substance in the air that is estimated to cause death in 50% 

24 (one half) of the test animals; median lethal concentration. 

25 LCLO: The lowest lethal concentration of a substance in the air reported to cause death, usually for a small 

26 percentage of the test animals. 

27

28 LD50: The statistically determined lethal dose of a substance that is estimated to cause death in 50% (one half) of 

29 the test animals; median lethal concentration. 

30 LDLO: The lowest dose of a substance that causes death, usually for a small percentage of the test animals. 

31 LEL: The minimum concentration of a gas or vapor in air, below which propagation of a flame does not occur in 

32 the presence of an ignition source. 

33 Lethality: Pertaining to or causing death; fatal; referring to the deaths resulting from acute toxicity studies. May 

34 also be used in lethality threshold to describe the point of sufficient substance concentration to begin to cause 

35 death. 

36 Lowest Observed Adverse Effect Level (LOAEL): The lowest tested dose or concentration of a substance that 

37 has been reported to cause harmful (adverse) health effects in people or animals. 

38 Mode of Action: The sequence of significant events and processes that describes how a substance causes a toxic 

39 outcome. Mode of action is distinguished from the more detailed mechanism of action, which implies a more 

40 detailed understanding on a molecular level. 
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viii

1 No Observed Adverse Effect Level (NOAEL): The highest tested dose or concentration of a substance that has 

2 been reported to cause no harmful (adverse) health effects in people or animals. 

3 Occupational Exposure Limit (OEL): Workplace exposure recommendations developed by governmental 

4 agencies and non-governmental organizations. OELs are intended to represent the maximum airborne 

5 concentrations of a chemical substance below which workplace exposures should not cause adverse health 

6 effects. OELs may apply to ceiling, short-term (STELs), or time-weighted average (TWA) limits. 

7 Peak Concentration: Highest concentration of a substance recorded during a certain period of observation. 

8 Permissible Exposure Limit (PEL): Occupational exposure limits developed by OSHA (29 CFR 1910.1000) or 

9 MSHA (30 CFR 57.5001) for allowable occupational airborne exposure concentrations. PELs are legally 

10 enforceable and may be designated as ceiling, STEL, or TWA limits. 

11

12 Point of Departure (POD): The point on the dose–response curve from which dose extrapolation is initiated. 

13 This point can be the lower bound on dose for an estimated incidence or a change in response level from a 

14 concentration-response model (BMC), or it can be a NOAEL or LOAEL for an observed effect selected from 

15 a dose evaluated in a health effects or toxicology study. 

16 RD50: The statistically determined concentration of a substance in the air that is estimated to cause a 50% (one 

17 half) decrease in the respiratory rate. 

18 Recommended Exposure Limit (REL): Recommended maximum exposure limit to prevent adverse health 

19 effects based on human and animal studies and established for occupational (up to 10-hour shift, 40-hour 

20 week) inhalation exposure by NIOSH. RELs may be designated as ceiling, STEL, or TWA limits. 

21 Short-Term Exposure Limit (STEL): A worker’s 15-minute time-weighted average exposure concentration that 

22 shall not be exceeded at any time during a work day. 

23 Target Organ: Organ in which the toxic injury manifests in terms of dysfunction or overt disease. 

24 Threshold Limit Values (TLVs®): Recommended guidelines for occupational exposure to airborne 

25 contaminants, published by the American Conference of Governmental Industrial Hygienists (ACGIH). TLVs 

26 refer to airborne concentrations of chemical substances and represent conditions under which it is believed 

27 that nearly all workers may be repeatedly exposed, day after day, over a working lifetime, without adverse 

28 effects. TLVs may be designated as ceiling, short-term (STELs), or 8-hr TWA limits. 

29 Time-Weighted Average (TWA): A worker’s 8-hour (or up to 10-hour) time-weighted average exposure 

30 concentration that shall not be exceeded during an 8-hour (or up to 10-hour) work shift of a 40-hour week. 

31 The average concentration is weighted to take into account the duration of different exposure concentrations. 

32 Toxicity: The degree to which a substance is able to cause an adverse effect on an exposed organism. 

33

34 Uncertainty Factors (UFs): Mathematical adjustments applied to the POD when developing IDLH values. The 

35 UFs for IDLH value derivation are determined by considering the study and effect used for the POD, with 

36 further modification based on the overall database. 

37 Workplace Environmental Exposure Levels (WEELs): Exposure levels developed by the American Industrial 

38 Hygiene Association (AIHA) that provide guidance for protecting most workers from adverse health effects 

39 related to occupational chemical exposures expressed as a TWA or ceiling limit.

40 
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ix

1 Acknowledgments 

2

3 This document was developed by the Education and Information Division (Paul Schulte, Ph.D., Director). G. 

4 Scott Dotson, Ph.D., was the project officer and lead NIOSH author for this technical report. The basis for this 

5 document was a report contracted by NIOSH and prepared by Andrew Maier, Ph.D., Ann Parker, and Lynn 

6 Haber, Ph.D. (Toxicology Excellence for Risk Assessment [TERA]). 

7

8 Education and Information Division 

9 Devin Baker, M.Ed. 

10 Charles L. Geraci, Ph.D. 

11 Thomas J. Lentz, Ph.D. 

12 Richard Niemeier, Ph.D. 

13 Chris Sofge, Ph.D. 

14

15 NIOSH would like to acknowledge the contribution of the following subject matter experts for their critical 

16 technical review of this report. 

17

18 Michael S. Bisesi, Ph.D., R.E.H.S., C.I.H., Senior Associate Dean for Academic Affairs; Director, Center 

19 for Public Health Practice; Interim Chair & Associate Professor, Division of Environmental Health 

20 Science, College of Public Health, Ohio State University 

21

22 Mary A. Fox, Ph.D., Assistant Professor; Co-Director, Risk Sciences and Public Policy Institute; 

23 Department of Health Policy and Management, Bloomberg School of Public Health, Johns Hopkins 

24 University 

25

26 Richard B. Schlesinger, Ph.D., Fellow A.T.S., Senior Associate Dean for Academic Affairs and Research 

27 Professor of Biology, Dyson College of Arts and Sciences, Pace University 
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1

1 1.0 Chlorine Pentafluoride 

2 1.1 Introduction 

3 1.1.1 Overview of the IDLH Value for Chlorine Pentafluoride 

4

5 IDLH Value: 1.7 ppm 

6

7 Basis for IDLH Value: The IDLH value for chlorine pentafluoride is based on a 10-minute mouse LOAEL of 

8 30 ppm associated with severe respiratory irritation in multiple species, which represents potentially escape9 impairing effects [MacEwen and Vernot 1972]. Duration adjustment yielded a 30-minute equivalent of 17.3 ppm. 

10 Application of a composite uncertainty factor of 10 to account for extrapolation from an escape-impairing effect, 

11 interspecies differences and human variability results an IDLH value for chlorine pentafluoride of 1.7 ppm. 

12

13 1.1.2 Purpose 

14

15 This IDLH Profile presents (1) a brief summary of technical data associated with acute inhalation exposures to 

16 chlorine pentafluoride and (2) the rationale behind the Immediately Dangerous to Life or Health (IDLH) value for 

17 chlorine pentafluoride. IDLH values are developed based on the scientific rationale and logic outlined in the 

18 NIOSH Current Intelligence Bulletin (CIB) 66: Derivation of Immediately Dangerous to Life or Health (IDLH) 

19 values [NIOSH 2013]. As described in CIB 66, NIOSH performs in-depth literature searches to ensure that all 

20 relevant data from human and animal studies with acute exposures to the substance are identified. Information 

21 included in CIB 66 on the literature search includes pertinent databases, key terms, and guides for evaluating data 

22 quality and relevance for the establishment of an IDLH value. The information that is identified in the in-depth 

23 literature search is evaluated with general considerations that include description of studies (i.e., species, study 

24 protocol, exposure concentration and duration), health endpoint evaluated, and critical effect levels (e.g., 

25 NOAELs, LOAELs, LC50 values). For chlorine pentafluoride, the in-depth literature search was conducted 

26 through February 2014. 

27

28 1.1.3 General Substance Information 

29

Chemical: Chlorine pentafluoride (ClF5)

* 30

31 CAS No: 13637-63-3 

32 Synonyms: Chlorine fluoride 
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2

Chemical category: Inorganic fluorine compounds; Inorganic chlorine compounds; Inorganic gases† 1

2

3 Structural formula:

4

5

6 Table 1 highlights selected physiochemical properties of chlorine pentafluoride relevant to IDLH conditions. 

7 Table 2 provides alternative exposure guidelines for chlorine pentafluoride. Table 3 summarizes the Acute 

8 Exposure Guidelines Level (AEGL) values for chlorine pentafluoride. 

9

10 Table 1: Physiochemical Properties of Chlorine Pentafluoride 

11

Property Value 

Molecular weight 130.45†

Chemical formula ClF5

Description Colorless or yellow gas 

Odor Suffocating, pungent

Odor Threshold Not available 

UEL Not available 

LEL Not available 

Vapor pressure 3.4 bar at 20°C 

Flash point Noncombustible†

Ignition temperature Noncombustible†

Solubility Hydrolysis†

Abbreviation: oC – Celsius; o 12 F – Fahrenheit; mmHg – millimeter mercury; LEL – lower explosive limit; UEL – upper explosive limit *

 AEGL [2010a]; † 13 IFA [2014] 

14

15 Table 2: Alternative Exposure Guidelines for Chlorine Pentafluoride 

16

Organization Value 

Original (SCP) IDLH value None 

NIOSH REL Not available 

OSHA PEL [2011] Not available 

ACGIH TLV [2014] Not available 

AIHA ERPG [2010] Not available 

AIHA WEEL [2010] Not available 

17 Abbreviation: ACGIH – American Conference of Governmental Industrial Hygienists; AIHA – American Industrial Hygiene 

18 Association; ERPG – Emergency Response Preparedness Guidelines; IDLH – immediately dangerous to life or health; NIOSH – National 

19 Institute for Occupational Safety and Health; OSHA – Occupational Safety and Health Administration; PEL – permissible exposure limit; 

20 REL – recommended exposure limit; SCP – Standard Completion Program; WEEL – workplace environmental exposure level 

21

22 

Cl

F F

F

F F
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1 Table 3: AEGL Values for Chlorine Pentafluoride 

2

Classification 10-min 30-min 1-hour 4-hour 8-hour Endpoint [AEGL-1 0.3 ppm 

1.6 mg/m3

0.3 ppm 1.6 mg/m3

0.3 ppm 1.6 mg/m3

NR NR No observ

[MacEwen 

AEGL-2 3.0 ppm 

16.0 mg/m3

2.0 ppm 10.1 mg/m3

1.0 ppm 5.3 mg/m3

0.48 ppm 2.6 mg/m3

0.33 ppm 1.8 mg/m3

Sensory irrimonkey, do[MacEwen 

AEGL-3 21.0 ppm 

112.0 mg/m3

12.0 ppm 64.0 mg/m3

8.0 ppm 42.7 mg/m3

3.9 ppm 20.8 mg/m3

2.7 ppm 14.4 mg/m3

Highest 1-hin rats [Darmer et 

Abbreviation: AEGL – acute exposure guideline levels; mg/m3 3 – milligrams per cubic meter; min – minute; NR – not recommended due to inadequate da* 4 References: NAS [2010a] 
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4

1 1.2 Animal Toxicity Data 

2

3 Chlorine pentafluoride penetrates the lungs, causing edema and destruction of lung tissue at lethal concentrations 

4 leading to pneumonia. It is also a potent irritant of the eyes and respiratory tract at non-lethal concentrations 

5 [Darmer et al. 1972; MacEwen and Vernot 1972, 1973]. Darmer et al. [1972] reported signs of moderate 

6 irritation (lacrimation, sneezing, and salivation) at the lowest concentrations tested for dogs and monkeys at 30 

7 minutes, 102 ppm for dogs (one death at this level) and 198 ppm for monkeys (no deaths at this level). 

8

9 MacEwen and Vernot [1972] exposed rats, mice, and monkeys to 10, 20, or 30 ppm for 60, 30, or 10 minutes, 

10 respectively. Lacrimation was observed in rats and mice, and rats also experienced salivation in all exposure 

11 groups. In monkeys, lacrimation and nausea were observed in all the exposure groups almost immediately after 

12 onset of exposure; all exposure groups also experienced transient depression of weight gain when observed for 28 

13 days after exposure. Monkeys exposed to 10 ppm for 60 minutes exhibited congested lungs; however, no gross 

14 lung lesions were observed in monkeys exposed to 30 ppm for 10 minutes. 

15

16 MacEwen and Vernot [1973] followed up with another study exposing mice, monkeys and dogs to 5, 10, or 30 

17 ppm for 60, 30, or 10 minutes, respectively. Immediate salivation, eye irritation, lacrimation, and rhinorrhea were 

18 observed in all species with the most severe irritation in the 30 ppm dose group, but no gross lung lesions were 

19 seen in any of the exposure groups. These effects were judged not to be of sufficient severity to be escape 

20 impairing. In addition, rats were exposed to 3, 7, or 30 ppm for 10 minutes. Slight eye irritation was noted in rats 

21 exposed to 7 ppm for 10 minutes, but there was no eye irritation in rats exposed to 3 ppm for 10 minutes 

22 [MacEwen and Vernot 1973].

23

24 Table 4 summarizes the LC data identified in animal studies and provides 30-minute equivalent derived values for 

25 chlorine pentafluoride. Table 5 provides non-lethal data reported in animal studies with 30-minute equivalent 

26 derived values. Information in these tables includes species of test animals, toxicological metrics (i.e., LC, 

27 NOAEL, LOAEL), adjusted 30-minute concentration, and the justification for the composite uncertainty factors 

28 applied to calculate the derived values. 
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1 Table 4: Lethal Concentration Data for Chlorine Pentafluoride2

Reference Species LC50

(ppm) 

LC10

(ppm) 

Time (min) 

Adjusted 30-min Concentration* (ppm) 

CompoUncertFactor 

Darmer et al. [1972] Dog 156 -- 30 156 30‡ Darmer et al. [1972] Monkey 218 -- 30 218 30‡ 

Darmer et al. [1972] Mouse 105 -- 30 105 30‡ Darmer et al. [1972] Rat 194 -- 30 194 30‡ Weinberg and Goldhamer [1967] Rat -- 200 10 115 10± 

3 Abbreviation: LC – lethal concentration; LC10 – concentration estimated to cause a 10% mortality rate; LC50 – median lethal concentration; LCLo – lowes4 caused death in humans or animals; min – minute; ppm – parts per million 5

*For exposures other than 30 minutes the ten Berge et al. [1986] relationship is used for adjustment (Cn 6 x t = k); NAS [2010a] empirically e

7 was used for extrapolating from all exposure times. 8 †The derived value is the result of the adjusted 30-minute LC value divided by the composite uncertainty factor. 9 ‡Composite uncertainty factor to account for adjustment of LC50 values to LC01 values, use of lethal concentration threshold in animals, inte

10 human variability. 

± 11 Composite uncertainty factor to account for lethal concentration threshold in animals, interspecies differences and human variability. 

1213141516
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1 Table 5: Non-lethal Concentration Data for Chlorine Pentafluoride 

2

Reference Species 

(reference) 

NOAEL (ppm) 

LOAEL (ppm) 

Time (min) 

Adjusted 30-min Concentration* (ppm) 

ComposUncertaiFactor 

MacEwen and Vernot [1972] Monkey, Dog, Mouse 10^ 30 10 3‡ MacEwen and Vernot [1972]€ Monkey, Dog, Mouse, Rat 30± 10 17.3 10+ 

MacEwen and Vernot [1972] Rat 3 10 1.7 3‡ 

MacEwen and Vernot [1972] Rat 7** 10 4 3‡ MacEwen and Vernot [1972] Rat 20†† 30 20 3‡ 

3 Abbreviation: NOAEL – no observed adverse effect level; min – minute; LOAEL – lowest observed adverse effect level; ppm – parts per million4

*For exposures other than 30 minutes the ten Berge et al. [1986] relationship is used for adjustment (Cn 5 x t = k); NAS [2010a] empirically e

6 was used for extrapolating from all exposure times. 

† 7 The derived value is the result of the adjusted 30-min value divided by the composite uncertainty factor. ^ 8 Concentration associated with immediate salivation, eye irritation, lacrimation, and rhinorrhea in multiple species. ‡ 9 Composite uncertainty factor assigned to account for interspecies differences and human variability.€ 10 Identified study is the primary basis of the IDLH value for chlorine pentafluoride. ± 11 Concentration associated with severe irritation in multiple species. + 12 Composite uncertainty factor to account for adjusting from adjustment to an escape-impairing effect, interspecies differences and human v** 13 Concentration associated with slight irritation. 

14 ††Concentration associated with immediate salivation, eye irritation, lacrimation, and rhinorrhea. 
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7

1 1.3 Human Data 

2

3 No human toxicity data were found, with the exception of a single case report. In this report, a researcher who 

4 had taken a single breath of 30 ppm chlorine pentafluoride in an exposure chamber while conducting an animal 

5 toxicity study [MacEwen and Vernot 1973], reported a mild “burning” of the lungs, mild nausea, an unpleasant 

6 taste in the mouth, and headache. The persistence of these symptoms was not reported [MacEwen and Vernot 

7 1973].

8 1.4 Summary 

9   

10 In the absence of adequate human data, the IDLH value is based on potentially escape-impairing effects including 

11 severe respiratory irritation in multiple species [MacEwen and Vernot 1972]. Test animals (i.e., monkey, dog, 

12 mouse, and rat) exposed to chlorine pentafluoride at concentrations ranging from 10 to 30 ppm for durations up to 

13 30 minutes experienced immediate salivation, eye irritation, lacrimation, rhinorrhea and respiratory irritation. 

14 More specifically, exposures to 30 ppm chlorine pentafluoride for 10 ppm was associated with severe respiratory 

15 irritation, which is considered escape-impairing. Duration adjusting yielded a 30-minute equivalent value of 17.3 

16 ppm. Application of a composite uncertainty factor to account for adjusting from an escape-impairing effect, 

17 interspecies differences and human variability results in an IDLH value of 1.7 ppm for chlorine pentafluoride. 
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8

1 2.0 Bromine Pentafluoride 

2 2.1 Introduction 

3 2.1.1 Overview of the IDLH Value for Bromine Pentafluoride 

4

5 IDLH value: 3.5 ppm 

6 Basis for IDLH Value: 

7 Data were inadequate to directly derive an IDLH value for bromine pentafluoride. For this reason, data from 

8 studies with chlorine pentafluoride were used to develop an IDLH value for bromine pentafluoride because their 

9 structures, reaction mechanisms, and potencies are similar. Therefore, deriving an IDLH value based on the 

10 toxicity data for chlorine pentafluoride is appropriately health-protective. 

11

12 The IDLH value for bromine pentafluoride is based on the 10-minute mouse LOAEL associated with severe 

13 escape-impairing effects including respiratory irritation reported in multiple species exposed to 30 ppm chlorine 

14 pentafluoride [MacEwen and Vernot 1972]. Duration adjustment yielded a 30-minute equivalent of 17.3 ppm. 

15 Application of a composite uncertainty factor of 10 to account for extrapolation from an escape-impairing effect, 

16 interspecies differences and human variability results an IDLH value for bromine pentafluoride of 1.7 ppm. 

17

18 2.1.2 Purpose 

19

20 This IDLH Profile presents (1) a brief summary of technical data associated with acute inhalation exposures to 

21 bromine pentafluoride and (2) the rationale behind the Immediately Dangerous to Life or Health (IDLH) value for 

22 bromine pentafluoride. IDLH values are developed based on the scientific rationale and logic outlined in the 

23 NIOSH Current Intelligence Bulletin (CIB) 66: Derivation of Immediately Dangerous to Life or Health (IDLH) 

24 values [NIOSH 2013]. As described in CIB 66, NIOSH performs in-depth literature searches to ensure that all 

25 relevant data from human and animal studies with acute exposures to the substance are identified. Information 

26 included in CIB 66 on the literature search includes pertinent databases, key terms, and guides for evaluating data 

27 quality and relevance for the establishment of an IDLH value. The information that is identified in the in-depth 

28 literature search is evaluated with general considerations that include description of studies (i.e., species, study 

29 protocol, exposure concentration and duration), health endpoint evaluated, and critical effect levels (e.g., 

30 NOAELs, LOAELs, LC50 values). For bromine pentafluoride, the in-depth literature search was conducted 

31 through February 2014.

32
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9

1 2.1.3 General Substance Information 

2

3 Chemical: Bromine pentafluoride (BrF5) 

4 CAS No: 7789-30-2 

Synonyms: Bromine fluoride* 5

Chemical category: Inorganic fluoride compounds; inorganic bromine compounds† 6

7 Structural formula:

8

9

10 Table 5 highlights selected physiochemical properties of bromine pentafluoride relevant to IDLH conditions. 

11 Table 6 provides alternative exposure guidelines for bromine pentafluoride. Table 7 summarizes the Acute 

12 Exposure Guidelines Level (AEGL) values for bromine pentafluoride. 

13

14 Table 5: Physiochemical Properties of Bromine Pentafluoride 

15

Property Value 

Molecular weight 174.89‡

Chemical formula BrF5

Description Colorless to pale yellow liquid 

Odor Pungent

Odor Threshold Not available 

UEL Not available§

LEL Not available§

Vapor pressure 328 mmHg at 20°C§

Flash point Noncombustible‡

Ignition temperature Noncombustible‡

Solubility Decomposes in water†

Abbreviation: oC – Celsius; o 16 F – Fahrenheit; mmHg – millimeter mercury; LEL – lower explosive limit; UEL – upper explosive limit *

 NLM [2014]; † IFA [2014]; ‡ 17 HSDB [2014]; 

18

19

20

21

22

23

24

Br

F

F

F

F F
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10

1 Table 6: Alternative Exposure Guidelines for Bromine Pentafluoride 

2

Organization Value 

Original (SCP) IDLH value None 

NIOSH REL 0.1 ppm (0.7 mg/m3), TWA 

OSHA PEL [2014] 0.1 ppm, TWA 8-hour 

ACGIH TLV [2014] 0.1 ppm, TWA 

AIHA ERPG [2010] Not available 

AIHA WEEL [2010] Not available 

3 Abbreviation: ACGIH – American Conference of Governmental Industrial Hygienists; AIHA – American Industrial Hygiene 

4 Association; ERPG – Emergency Response Preparedness Guidelines; IDLH – immediately dangerous to life or health; NIOSH – National 

5 Institute for Occupational Safety and Health; OSHA – Occupational Safety and Health Administration; PEL – permissible exposure limit; 

6 REL – recommended exposure limit; SCP – Standards Completion Program; TWA – time-weighted average; WEEL – workplace 

7 environment exposure level 

8 

9
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1 Table 7: AEGL Values for Bromine Pentafluoride* 

2

Classification 10-min 30-min 1-hour 4-hour 8-hour Endpoint [AEGL-1 NR NR NR NR NR No data AEGL-2 3.0 ppm 

21.5 mg/m3

2.0 ppm 14.3 mg/m3

1.0 ppm 7.2 mg/m3

0.48 ppm 3.4 mg/m3

0.33 ppm 2.4 mg/m3

Based on pentafluor

AEGL-3 79.0 ppm 

565.1 mg/m3

55.0 ppm 393.4 mg/m3

33.0 ppm 236.0 mg/m3

8.3 ppm 59.4 mg/m3

4.2 ppm 30.0 mg/m3

Highest noin the rat [Dost et al

Abbreviation: AEGL – acute exposure guideline levels; mg/m3 3 – milligrams per cubic meter; min – minute; NR – not recommended due to insufficient da

4 References: NAS [2010b] 

* 5 Values based on analogy with chlorine pentafluoride 
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12

1 2.2 Animal Toxicity Data 

2

3 Bromine pentafluoride is corrosive to eyes, mucous membranes, respiratory tract and exposed skin. No deaths 

4 were reported in rats exposed to bromine pentafluoride at 500 ppm for 40 minutes, or to 1000 ppm for 20 minutes

5 [Dost et al. 1968]. The impact of exposure scenario on toxicity appears to be large, at least in this exposure 

6 duration, since slightly longer durations resulted in very high lethality. Exposure to 500 ppm for 60 minutes 

7 resulted in 95% mortality, and 12/12 rats died after exposure to 1000 ppm for 25 minutes [Dost et al. 1968]. 

8 Because of the apparently large impact of exposure duration, with large implications of small differences in 

9 measurements or between studies, it would be useful to have additional supporting studies on bromine 

10 pentafluoride. In the absence of additional studies, these data were considered insufficient for derivation of an 

11 IDLH value.

12

13 The toxicity of halogen fluorides appears to be consistent with their relative reactivity. The mechanism of 

14 toxicity is the same as that of the other halogen causing localized irritation and tissue damage at the site of contact 

15 [AEGL 2010b]. In studies with rats, one found no lethality after exposure to 500 ppm bromine pentafluoride for 

16 30 minutes [Dost et al. 1970], while Darmer et al. [1972] reported a 30-minute LC50 value of 194 ppm for 

17 chlorine pentafluoride. This suggests that bromine pentafluoride is less toxic than chlorine pentafluoride. Dost et 

18 al. [1970] also found similar signs of toxicity for chlorine trifluroide and bromine pentafluoride. There was 

19 however, a greater severity of respiratory tract damage following bromine pentafluoride exposure, but this may 

20 have been due to the somewhat higher concentrations tested for this chemical (e.g., 500 ppm vs. 400 ppm). Based 

21 on these considerations and the limited empirical data for bromine pentafluoride, this assessment uses chlorine 

22 pentafluoride as a surrogate. 

23 

24 LC50 data and information on nonlethal effects of chlorine pentafluoride are available in multiple species, with the 

25 results showing respiratory and ocular irritation, leading to edema and tissue destruction at lethal levels [Darmer 

26 et al. 1972; MacEwen and Vernot 1972, 1973]. In monkeys, dogs, rats and mice, sensory irritation and reversible 

27 mild lung congestion were observed following chlorine pentafluoride exposures to 30 ppm for 10 minutes, 20 

28 ppm for 30 minutes or 10 ppm for 60 minutes [MacEwen and Vernot 1972, 1973]. Table 4 summarizes the LC 

29 data, while Table 5 summarizes non-lethal data, presented in animal studies and provides 30-minute equivalent 

30 derived values for chlorine pentafluoride. 

31
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13

1 2.3 Human Data 

2

3 No human toxicity data were located. 

4

5 2.4 Summary 

6

7 Inadequate toxicity data were available for bromine pentafluoride. The data on chlorine pentafluoride are used to 

8 derive an IDLH value for bromine pentafluoride because their structures, reaction mechanisms, and potencies are 

9 similar. Therefore, deriving an IDLH value based on the toxicity data for chlorine pentafluoride is appropriately 

10 health-protective. In the absence of adequate human data, the IDLH value is based on potentially escape11 impairing effects including severe respiratory irritation in multiple species [MacEwen and Vernot 1972]. Test 

12 animals (i.e., monkey, dog, mouse, and rat) exposed to chlorine pentafluoride at concentrations ranging from 10 

13 to 30 ppm for durations up to 30 minutes experienced immediate salivation, eye irritation, lacrimation, rhinorrhea 

14 and respiratory irritation. More specifically, exposures to 30 ppm chlorine pentafluoride for 10 ppm was 

15 associated with severe respiratory irritation, which is considered escape-impairing. Duration adjusting yielded a 

16 30-minute equivalent value of 17.3 ppm. Application of a composite uncertainty factor to account for adjusting 

17 from an escape-impairing effect, interspecies differences and human variability results in an IDLH value of 1.7 

18 ppm for chlorine pentafluoride. 
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14

1 3.0 References 

2

3 ACGIH (American Conference of Governmental Industrial Hygienists) [2014]. Annual TLVs® (Threshold Limit 

4 Values) and BEIs® (Biological Exposure Indices) booklet. Cincinnati, OH: ACGIH Signature Publications. 

5

6 AIHA [2006]. AIHA Emergency Response Planning (ERP) Committee procedures and responsibilities. Fairfax, 

7 VA: American Industrial Hygiene Association. [https://www.aiha.org/get8 involved/AIHAGuidelineFoundation/EmergencyResponsePlanningGuidelines/Documents/ERP-SOPs2006.pdf]. 

9 Date accessed: March 17, 2014. 

10

11 AIHA (American Industrial Hygiene Association) [2009]. AIHA Emergency Response Planning (ERP) 

12 Committee procedures and responsibilities. Fairfax, VA: American Industrial Hygiene Association. 

13

14 AIHA (American Industrial Hygiene Association) [2010]. Emergency response planning guidelines (ERPG) and 

15 workplace environmental exposure levels (WEEL) handbook. Fairfax, VA: American Industrial Hygiene 

16 Association Press. 

17

18 AIHA [2010a]. AIHA Emergency Response Planning (ERP) Committee procedures and responsibilities. Fairfax, 

19 VA: American Industrial Hygiene Association. 

20

21 AIHA [2010b]. Emergency response planning guidelines (ERPG) and workplace environmental exposure levels 

22 (WEEL) handbook. Fairfax, VA: American Industrial Hygiene Association Press 

23

24 Darmer KI Jr., Haun CC, Mac Ewen JD [1972]. The acute inhalation toxicology of chlorine pentafluoride. Hyg 

25 Assoc J 33(10):661–668. 

26

27 Dost FN, Reed DJ, Finch A, Wang CH [1968]. Metabolism and pharmacology of inorganic and fluorine 

28 containing compounds. AMRL-TR-67-224, AD 681 161, Available from National Technical Information Center, 

29 Springfield, VA. 

30

31 Dost FN, Reed DJ, Cooper TD, Wang CH [1970]. Fluorine distribution in rats following acute intoxication with 

32 nitrogen and halogen fluorides and with sodium fluoride. Toxicol Appl Pharmacol 17:573–584. 

33

34 HSDB (Hazardous Substances Data Bank) [2014]. [http://toxnet.nlm.nih.gov/cgi-bin/sis/htmlgen?HSDB]. Date 

35 accessed: March 17, 2014. 

36

37 IFA (Institut für Arbeitsschutz der Deutschen Gesetzlichen Unfallversicherung) [2014]. GESTIS: database on 

38 hazardous substances. 

39 [http://gestis-en.itrust.de/nxt/gateway.dll?f=templates&fn=default.htm&vid=gestiseng:sdbeng]. Date accessed: 

40 March 17, 2014. 

41
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15

1 MacEwen JD, Vernot EH [1972]. Toxic hazards research unit annual technical report. Wright-Patterson Air Force 

2 Base, OH: Aerospace Medical Research Laboratory, Air Force Systems Command, Report No. AMRL-TR-72-62, 

3 NTIS AD755-358. 

4

5 MacEwen JD, Vernot EH [1973]. Toxic hazards research unit annual technical report. Wright-Patterson Air Force 

6 Base, OH: Aerospace Medical Research Laboratory, Air Force Systems Command, Report No. AMRL-TR-73-83, 

7 NTIS AD771-025. 

8

9 NAS (National Academy of Science) [2001]. Standing operating procedures for developing Acute Exposure 

10 Guidelines Levels for hazardous chemicals. NAS, National Research Council (NRC), Committee on Toxicology, 

11 Subcommittee on Acute Exposure Guideline Levels. National Academy Press: Washington, DC. IBSN: 0-309-

12 07553-X. [http://www.epa.gov/oppt/aegl/pubs/sop.pdf]. Date accessed: March 17, 2014. 

13

14 NAS (National Academy of Sciences) [2010a]. Interim Acute Exposure Guideline Levels (AEGLs) for chlorine 

15 pentafluoride (CAS No. 13637-63-3). NAS, National Research Council (NRC), Committee on Toxicology, 

16 Subcommittee on Acute Exposure Guideline Levels. National Academy Press: Washington, DC.

17 [http://www.epa.gov/oppt/aegl/pubs/chlorine_pentafluoride_interim_ornl_src_may2010c.pdf]. Date accessed: 

18 March 17, 2014. 

19

20 NAS (National Academy of Sciences) [2010b]. Interim Acute Exposure Guideline Levels (AEGLs) for bromine 

21 pentafluoride (CAS No. 7789-30-2). NAS, National Research Council (NRC), Committee on Toxicology, 

22 Subcommittee on Acute Exposure Guideline Levels. National Academy Press: Washington, DC. 

23 [http://www.epa.gov/oppt/aegl/pubs/bromine_pentafluoride_interim_ornl_apr2010c.pdf]. Date accessed: March 

24 17, 2014. 

25

26 NIOSH (National Institute for Occupational Safety and Health) [2004]. NIOSH respirator selection logic. 

27 Cincinnati, OH: U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, 

28 National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2005-100. 

29 [http://www.cdc.gov/niosh/docs/2005-100/pdfs/2005-100.pdf]. Date accessed: March 17, 2014. 

30

31 NIOSH [2013]. NIOSH Current Intelligence Bulletin 66: Derivation of Immediately Dangerous to Life or Health 

32 (IDLH) values. Cincinnati, OH: U.S. Department of Health and Human Services, Centers for Disease Control and 

33 Prevention, National Institute for Occupational Safety and Health, DHHS (NIOSH) Publication No. 2014-100. 

34 [http://www.cdc.gov/niosh/docs/2014-100/pdfs/2014-100.pdf]. Date accessed: March 17, 2014. 

35

36 NIOSH [2014]. NIOSH pocket guide to chemical hazards. Cincinnati, OH: U.S. Department of Health and 

37 Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and 

38 Health, DHHS (NIOSH) Publication No. 2005-149. [http://www.cdc.gov/niosh/npg/]. Date accessed: March 17, 

39 2014. 

40

41 NLM (National Library of Medicine) [2014]. ChemIDplus lite. [http://chem.sis.nlm.nih.gov/chemidplus/]. Date 

42 accessed: March 17, 2014. 

43
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16

1 OSHA (Occupational Safety and Health Administration) [2014]. Occupational Safety and Health Standards. 29 

2 CFR 1910. Subpart Z -- Toxic and Hazardous Substances. OSHA; Washington, DC 

3 [http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=standards&p_id=9992]. Date accessed: 

4 August 1, 2014. 

5

6 ten Berge WF, Zwart A, Appelman LM [1986]. Concentration-time mortality response relationship of irritant and 

7 systematically acting vapours and gases. J Haz Mat 13:301–309. 

8

9 USEPA (U.S. Environmental Protection Agency) [2014]. Integrated Risk Information System (IRIS). 

10 [http://www.epa.gov/IRIS/]. Date accessed: March 17, 2014. 

11

12 Weinberg MS, Goldhamer RE [1967]. Pharmacology and metabolism of Compound A. ADA286095; Available 

13 from National Technical Information Service, Springfield, VA. 

14