HYDROFLUORIC ACID, SOLUTION
|CAS Number||UN/NA Number|
|DOT Hazard Label||USCG CHRIS Code|
|NIOSH Pocket Guide||International Chem Safety Card|
|Health||4||Can be lethal.|
|Flammability||0||Will not burn under typical fire conditions.|
|Instability||1||Normally stable but can become unstable at elevated temperatures and pressures.|
Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. UN1796, UN1802, UN1826, UN2032, UN3084, UN3085, and, at concentrations above 65%, UN2031 may act as oxidizers. Also consult ERG Guide 140. Vapors may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.). Substance may react with water (some violently), releasing corrosive and/or toxic gases and runoff. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water. (ERG, 2020)
TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or death. Reaction with water or moist air may release toxic, corrosive or flammable gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Fire will produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may be corrosive and/or toxic and cause environmental contamination. (ERG, 2020)
Mixing in equal molar portions with any of the following substances in a closed container caused the temperature and pressure to increase: acetic anhydride, 2-aminoethanol, chlorosulfonic acid, aqueous ammonia (48.7%), ethylenediamine, ethyleneimine, oleum, aqueous sulfuric acid (48.7%), aqueous sodium hydroxide (48.7%), propylene oxide, vinyl acetate [NFPA 1991].
Use caution: Liquids with this reactive group classification have been known to react with the absorbents listed below. More info about absorbents, including situations to watch out for...
- Mineral-Based & Clay-Based Absorbents
IMMEDIATE PRECAUTIONARY MEASURE: Isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids.
SPILL: Increase the immediate precautionary measure distance, in the downwind direction, as necessary.
FIRE: If tank, rail car or tank truck is involved in a fire, ISOLATE for 800 meters (1/2 mile) in all directions; also, consider initial evacuation for 800 meters (1/2 mile) in all directions. (ERG, 2020)
Note: Some foams will react with the material and release corrosive/toxic gases.
SMALL FIRE: CO2 (except for Cyanides), dry chemical, dry sand, alcohol-resistant foam.
LARGE FIRE: Water spray, fog or alcohol-resistant foam. If it can be done safely, move undamaged containers away from the area around the fire. Avoid aiming straight or solid streams directly onto the product. Dike runoff from fire control for later disposal.
FIRE INVOLVING TANKS OR CAR/TRAILER LOADS: Fight fire from maximum distance or use unmanned master stream devices or monitor nozzles. Do not get water inside containers. Cool containers with flooding quantities of water until well after fire is out. Withdraw immediately in case of rising sound from venting safety devices or discoloration of tank. ALWAYS stay away from tanks engulfed in fire. (ERG, 2020)
ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area. All equipment used when handling the product must be grounded. Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. A vapor-suppressing foam may be used to reduce vapors. DO NOT GET WATER INSIDE CONTAINERS. Use water spray to reduce vapors or divert vapor cloud drift. Avoid allowing water runoff to contact spilled material. Prevent entry into waterways, sewers, basements or confined areas.
SMALL SPILL: Cover with DRY earth, DRY sand or other non-combustible material followed with plastic sheet to minimize spreading or contact with rain. Use clean, non-sparking tools to collect material and place it into loosely covered plastic containers for later disposal. (ERG, 2020)
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. (ERG, 2020)
|QS = Tychem 2000 SFR|
|QC = Tychem 2000|
|SL = Tychem 4000|
|C3 = Tychem 5000|
|TF = Tychem 6000|
|TP = Tychem 6000 FR|
|RC = Tychem RESPONDER® CSM|
|TK = Tychem 10000|
|RF = Tychem 10000 FR|
|Hydrofluoric acid (48-51%)||7664-39-3||Liquid||400||446||>480||>480||>480||15||>480||>480||>480|
|Hydrofluoric acid (60%)||7664-39-3||Liquid||52|
|Hydrofluoric acid (70%)||7664-39-3||Liquid||143||126||35||>480||>480||>480|
|Hydrogen fluoride (20-27°C, gaseous)||7664-39-3||Vapor||imm||93*/134||186||imm||imm||130||>480||>480|
"imm" indicates immediate; having a normalized breakthrough time of 10 minutes or less.
* indicates based on lowest single value.
Special Warning from DuPont: Tychem® and Tyvek® fabrics should not be used around heat, flames, sparks or in potentially flammable or explosive environments. Only...
Call 911 or emergency medical service. Ensure that medical personnel are aware of the material(s) involved and take precautions to protect themselves. Move victim to fresh air if it can be done safely. Give artificial respiration if victim is not breathing. Do not perform mouth-to-mouth resuscitation if victim ingested or inhaled the substance; wash face and mouth before giving artificial respiration. Use a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult. Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush skin or eyes with running water for at least 20 minutes. In case of skin contact with Hydrofluoric acid (UN1790), if calcium gluconate gel is available, rinse 5 minutes, then apply gel. Otherwise, continue rinsing until medical treatment is available. For minor skin contact, avoid spreading material on unaffected skin. Keep victim calm and warm. Effects of exposure (inhalation, ingestion or skin contact) to substance may be delayed. (ERG, 2020)
Note: For Vapor Density and Specific Gravity, comparing the value to 1.0 can tell you if the chemical will likely sink/rise in air or sink/float in fresh water (respectively). Short phrases have been added to those values below as an aid. However, make sure to also consider the circumstances of a release. The Vapor Density comparisons are only valid when the gas escaping is at the same temperature as the surrounding air itself. If the chemical is escaping from a container where it was pressurized or refrigerated, it may first escape and behave as a heavy gas and sink in the air (even if it has a Vapor Density value less than 1). Also, the Specific Gravity comparisons are for fresh water (density 1.0 g/mL). If your spill is in salt water (density about 1.027 g/mL), you need to adjust the point of comparison. There are some chemicals that will sink in fresh water and float in salt water.
AEGLs (Acute Exposure Guideline Levels)
|10 minutes||1 ppm||95 ppm||170 ppm|
|30 minutes||1 ppm||34 ppm||62 ppm|
|60 minutes||1 ppm||24 ppm||44 ppm|
|4 hours||1 ppm||12 ppm||22 ppm|
|8 hours||1 ppm||12 ppm||22 ppm|
ERPGs (Emergency Response Planning Guidelines)
|Hydrogen Fluoride (7664-39-3) **||2 ppm||20 ppm||50 ppm|
indicates that odor should be detectable near ERPG-1.
PACs (Protective Action Criteria)
|Hydrogen fluoride; (Hydrofluoric acid) (7664-39-3)||1 ppm||24 ppm||44 ppm|
EPA Consolidated List of Lists
|Regulatory Name||CAS Number/
313 Category Code
|CERCLA RQ||EPCRA 313
|Hydrofluoric acid||7664-39-3||100 pounds||100 pounds||100 pounds||X||U134|
|Hydrofluoric acid (conc. 50% or greater)||7664-39-3||100 pounds||100 pounds||100 pounds||X||U134||1000 pounds|
|Hydrogen fluoride||7664-39-3||100 pounds||100 pounds||100 pounds||313||U134|
|Hydrogen fluoride (anhydrous)||7664-39-3||100 pounds||100 pounds||100 pounds||X||U134||1000 pounds|
- "X" indicates that this is a second name for an EPCRA section 313 chemical already included on this consolidated list. May also indicate that the same chemical with the same CAS number appears on another list with a different chemical name.
(EPA List of Lists, 2022)
CISA Chemical Facility Anti-Terrorism Standards (CFATS)
|Chemical of Interest||CAS Number||Min Conc||STQ||Security
|Hydrofluoric acid (conc. 50% or greater)||7664-39-3||50.00 %||1000 pounds||toxic|
|Hydrogen fluoride (anhydrous)||7664-39-3||1.00 %||1000 pounds||toxic||42.53 %||45 pounds||WME|
- WME = weapons of mass effect.
OSHA Process Safety Management (PSM) Standard List
|Chemical Name||CAS Number||Threshold Quantity (TQ)|
|Hydrofluoric Acid, Anhydrous||7664-39-3||1000 pounds|
|Hydrogen Fluoride||7664-39-3||1000 pounds|
- ALSURF 45
- ANTISAL 2B
- AQUEOUS HYDROGEN FLUORIDE (I.E., HYDROFLUORIC ACID)
- FLUORHYDRIC ACID
- FLUORIC ACID
- FLUORINE HYDRIDE (FH)
- FLUORINE MONOHYDRIDE
- HYDROFLUORIC ACID
- HYDROFLUORIC ACID (CONC. 50% OR GREATER)
- HYDROFLUORIC ACID, SOLUTION
- HYDROGEN FLUORIDE (HF)
- HYDROGEN FLUORIDE (HYDROFLUORIC ACID)
- HYDROGEN MONOFLUORIDE