HYDROFLUORIC ACID

SYNONYMS: ANHYDROUS HYDROGEN FLUORIDE; ANHYDROFLUORIC ACID; AQUEOUS  HYDROGENFLUORIDE; BOE (BUFFERED OXIDE ETCH); C-P 8 SOLUTION; DOPED POLY ETCH; EEC No. 009-002-00-6; 231-634-8; FLUORURO de HIDROGENO (Spanish); FLUSSAEURE (German); FLUSSYRE (French); FRECKLE ETCH; HYDROFLUORIDE; HF-A; HYDROGENFLUORIDE; IMPLANTER FUMER; KTI BUFFERED OXIDE ETCH 6:1; KTI  BUFFERED OXIDE ETCH 50:1; KTI OXIDE ETCH 5:1; KTI OXIDE ETCH 10:1; KTI OXIDE ETCH 50:1; MAE ETCHANTS; MIXED ACID ETCH; POLY ETCH 95%; RDX-221 ALUMETCH LK; RUBIGINE; SILICON ETCH SOLUTION; WRIGHT ETCH

IDENTIFICATION:

CAS: 7664-39-3

DOT ID: UN1052 (anhydrous); UN1790 (solution, with > 60 % strength)

Hazard Class or Division: 8 (CORROSIVE MATERIAL) ; s u b s i d i a r y r i s k: 6. 1 (POISONOUS/TOXIC MATERIALS)

ERG Guide: 125 (UN1052); 157 (UN1790)

Formula: HF

RTECS No: MW7875000

Properties: Nonflammable gas or fuming watery liquid (below 67°F/19°C). Colorless to green; weak solutions have appearance of water. Shipped as a 40 to 70% solution of hydrogenfluoride in water. Sharp, irritating odor. Sinks and mixes with water, with release of heat and toxic hydrofluoric acid and heat. The pure compound is a crystalline solid below 12°F ( ! 11°C). Often used in aqueous solution. Gas is slightly lighter than air.

Uses: Electropolishing; in pickling baths for metals such as stainless steel, etching.

HEALTH & SAFETY INFORMATION

• IDLH: 30 ppm as hydrogenfluoride

• Odor threshold: 0.04 ppm as HF. Disagreeable, pungent odor at <1 ppm/irritation of eyes and throat at 3 ppm.

• OSHA Table Z-1 and Z-2 Air Contaminant

• OSHA Process Safety Management of Highly Hazardous Chemicals (29 CFR1910.119, Appendix A), Threshold Quantity: 1000 pounds as hydrofluoric acid, anhydrous or hydrogenfluoride.

• NIOSH Criteria Document : NIOSH 76-143

• Vapor and liquid are extremely corrosive to, eyes, skin, and respiratory tract. Exposure may cause lung edema; the effects may be delayed. Extremely corrosive if swallowed. Long term hydrogenfluoride exposure has been reported to damage the kidneys and liver. Fluorine and hydrogenfluoride are very irritating to the skin, eyes, and respiratory tract. At high levels, hydrogenfluoride can also damage the heart. In adults, high fluoride exposure over a long time can lead to skeletal fluorosis with denser bones, joint pain, and a limited range of joint movement. Although fluoride exposure results in denser bones, the bone appears to be weaker than normal bone and there may be a greater risk of breaking the bone. Animal studies: In animals, exposure to high doses of fluoride can result in decreased fertility and sperm and testes damage.

Exposure Limits:

• ACGIH TLV: 3 ppm/2.5 mg[F]/m3 TWA; BEI: 3 mg[F]/g creatinine in urine prior to end of shift; 10 mg[F]/g creatinine in urine end of shift

• OSHA PEL: 3 ppm/2.5 mg[F]/m3 TWA

• NIOSH REL: 3 ppm/2.5 mg[F]/m3 TWA; 6 ppm/5 mg[F]/m3, 15 min. ceiling limit

• DFG MAK: 2.5 mg[F]/m3; BAT: 7.0 mg[F]/g creatinine in urine at end of shift; 4.0 mg[F]/g creatinine in urine at the beginning of the next shift.

Respirator: 30 ppm: CCRS [any chemical cartridge respirator with cartridge(s) providing protection against the compound of concern] PAPRS [any powered, airpurifying respirator with cartridge(s) providing protection against the compound of concern] GMFS [any air-purifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern] SA (any supplied-air respirator) SCBA (any selfcontained breathing apparatus). Emergency or Planned Entry into Unknown Concentrations or IDLH Conditions SCBAF:PD,PP (any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positivepressure mode) SAF:PD,PP:ASCBA (any suppliedair respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained breathing apparatus operated in a pressure-demand or other positive-pressure mode).

Escape: GMFS [any airpurifying, full-facepiece respirator (gas mask) with a chin-style, front- or back-mounted canister providing protection against the compound of concern] SCBAE (any appropriate escape-type, self-contained breathing apparatus). Note: Substance reported to cause eye irritation or damage; may require eye protection.

Reactivity: A strong acid. Reacts–possibly with  violence–with acetic anhydride, aliphatic amines, alcohols, alkanolamines, alkylene oxides, aromatic amines, amides, 2-aminoethanol, ammonia, ammonium hydroxide, arsenic trioxide, bismuthic acid, calcium oxide, ethylene diamine, ethyleneimine, epichlorohydrin, isocyanates, metal acetylides, nitrogen trifluoride, oleum, organic anhydrides, oxygen difluoride, phosphorus pentoxide, sulfuric acid, sodium hydroxide and other bases, strong oxidizers, vinyl acetate, and vinylidene fluoride. Attacks glass, concrete, ceramics, some metals (forming flammablehydrogen gas), some plastics, rubber, and coatings.

FIRE INFORMATION: If material or contaminated runoff enters waterways, notify downstream users of potentially contaminated water.

Hazard Classifications:

Health Hazard (Blue) . . . . . . . . . . . . . . 4

Flammability (Red) . . . . . . . . . . . . . . .   0

Reactivity (Yellow) . . . . . . . . . . . . . . . . 0

FIRST AID: GASES - CORROSIVE (125) : Move victim to fresh air. Call emergency medical care. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of 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 liquefied gas, thaw frosted parts with lukewarm water. In case of contact with substance, immediately flush skin or eyes with running water for at least 20 minutes. Keep victim warm and quiet. Keep victim under observation. Effects of contact or inhalation may be delayed. Ensure that medical personnel are aware of the material(s) involved, and take precautions to protect themselves. T O X I C a n d / o r C O R R O S I V E (NONCOMBUSTIBLE/WATER SENSITIVE) (157) : Move victim to fresh air. Call emergency medical care. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of 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. For minor skin contact, avoid spreading material on unaffected skin. Keep victim warm and quiet. Effects of exposure (inhalation, ingestion, or skin contact) may be delayed. Ensure that medical personnel are aware of the material(s) involved, and take precautions to protect themselves.

ENVIRONMENTAL REGULATIONS

• Clean Air Act: Hazardous Air Pollutants (Title I, Part A, Section 112).

• Clean Water Act: Section 311 Hazardous Substances/RQ (same as CERCLA); Section 313 Priority Chemicals.

• EPA Hazardous Waste Number (RCRA No.): U134.

• EPCRA Section 302 Extremely Hazardous Substances: TPQ = 100 lb (45.4 kg).

• EPCRA Section 304: Reportable Quantity (RQ): CERCLA, 100 lb (45.4 kg).

• EPCRA Section 313: Form R de minimis concentration reporting level: 1.0%.

• EPA Best Practical Control Technology Limits for Metal Finishing Effluent: pH, Maximum 1 day: 6.0–9.5; Daily average/30 consecutive days: 6.0–9.5

• California LOL: DEGIJLMNOQR

• WHMIS, Ingredients Disclosure List (Canada): 1%