Product: Hydrogen Chloride Form No.: P-4606-C Date: October 1997
Praxair鈩? Material Safety Data Sheet
1. Chemical Product and Company Identification
Hydrogen Chloride (MSDS No. Hydrogen Chloride
Product Trade Name:
P-4606-C)
Name:
Hydrogen Anhydrous Hydrochloric Acid
Chemical Synonyms:
Chloride
Name:
HCl Chemical Family: Inorganic Acid Anhydride
Formula:
1-800-645-4633* Company Name: Praxair, Inc.
Telephone: Emergencies:
CHEMTREC 1-800-424-9300* 39 Old Ridgebury Road
1-800-PRAXAIR Danbury CT 06810-5113
Routine:
*Call emergency numbers 24 hours a day only for spills, leaks, fire, exposure, or accidents involving
this product. For routine information contact your supplier, Praxair sales representative, or call
1-800-PRAXAIR (1-800-772-9247).
2. Composition / Information on Ingredients
For custom mixtures of this product request a Material Safety Data Sheet for each component. See
Section 16 for important information about mixtures.
INGREDIENT NAME CAS NUMBER PERCENTAGE OSHA PEL ACGIH TLV
Hydrogen Chloride 7647-01-0 >99* 5 ppm ceiling 5 ppm ceiling
*The symbol ">" means "greater than."
3. Hazards Identification
EMERGENCY OVERVIEW
DANGER! Toxic, corrosive, high-pressure liquid and gas.
May cause liver damage.
Can cause eye, skin, and respiratory tract burns.
Self-contained breathing apparatus must
be worn by rescue workers.
Odor: Pungent, suffocating
THRESHOLD LIMIT VALUE: 5 ppm ceiling ACGIH 1997. Note: Ceiling limits are not Time
Weighted Average (TWA).
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Copyright 1984, 1985, 1992, 1997 Praxair Technology, Inc.
All rights reserved.
Product: Hydrogen Chloride Form No.: P-4606-C Date: October 1997
EFFECTS OF A SINGLE (ACUTE) OVEREXPOSURE:
INHALATION鈥揙verexposure to vapor concentrations moderately above the Threshold Limit Value
(TLV) of 5 ppm irritates the upper respiratory tract. Concentrations ranging from 50-100 ppm are
intolerable. High concentrations (e.g., greater than 50 ppm) cause choking, coughing, burning of the
throat, and severe irritation of respiratory tract, with possible ulceration of the nose, throat, and larynx,
laryngeal spasm, pulmonary edema, and general lung injury. Exposure to concentrations of 1500-2000
ppm is life-threatening. Liver and kidney injury has been reported after exposure to vapors.
SKIN CONTACT鈥揌ydrogen chloride gas may severely irritate the skin, causing chemical burns with
ulceration and scarring. Repeated exposure to vapors may produce dermatitis. With prolonged or
widespread contact, the skin may absorb harmful amounts of material.
SWALLOWING鈥揌ighly toxic. May cause chemical burns of the mouth, throat, esophagus, and
stomach, with severe pain, nausea, diarrhea, vomiting, dizziness, weakness, and collapse.
EYE CONTACT鈥揈xposure to the eye causes immediate pain and irritation with excess tear production
and closure of the eyelids. The severity of injury depends on the concentration and duration of contact
and may range from slight excess redness and irritation of the conjunctiva to total corneal opacification
and blindness.
EFFECTS OF REPEATED (CHRONIC) OVEREXPOSURE: Prolonged or repeated exposure to
vapor may discolor or erode the teeth, cause the nose and gums to bleed, and ulcerate the nasal mucosa..
OTHER EFFECTS OF OVEREXPOSURE: None known.
MEDICAL CONDITIONS AGGRAVATED BY OVEREXPOSURE: Breathing of vapor or mist may
aggravate asthma and inflammatory or fibrotic pulmonary disease. Skin contact may aggravate an existing
dermatitis.
SIGNIFICANT LABORATORY DATA WITH POSSIBLE RELEVANCE TO HUMAN HEALTH
HAZARD EVALUATION: None known.
CARCINOGENICITY: Hydrogen Chloride is not listed by NTP, OSHA, and IARC.
4. First Aid Measures
INHALATION: Remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult,
qualified personnel may give oxygen. Keep victim warm. Seek medical attention promptly.
SKIN CONTACT: Immediately flush skin with plenty of water while removing contaminated clothing and
shoes. Discard clothing and shoes.
SWALLOWING: Rinse mouth with water. Give two glasses of water. Do not induce vomiting. Call a
physician.
EYE CONTACT: Immediately flush eyes thoroughly with water for at least 15 minutes. Hold the eyelids
open and away from the eyeballs to ensure that all surfaces are flushed thoroughly. See a physician,
preferably an ophthalmologist, immediately.
NOTES TO PHYSICIAN: Keep victims of overexposure under medical observation for 24-48 hours.
The hazards of this material are mainly due to its severely irritant and corrosive properties on skin and
mucosal surfaces. There is no specific antidote, and treatment should be directed at the control of
symptoms and the clinical condition.
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Product: Hydrogen Chloride Form No.: P-4606-C Date: October 1997
5. Fire Fighting Measures
Not applicable Not applicable
FLASH POINT AUTOIGNITION
(test method) TEMPERATURE
Not applicable Not applicable
FLAMMABLE LIMITS LOWER UPPER
IN AIR, % by volume
EXTINGUISHING MEDIA: Hydrogen Chloride cannot catch fire. Use media appropriate for sur-
rounding fire, but note incompatibilities in section 10.
SPECIAL FIRE FIGHTING PROCEDURES:
DANGER! Toxic, corrosive, high-pressure liquid and gas (see section 3). Immediately evacuate all
personnel from danger area. Do not approach area without self-contained breathing apparatus, protective
clothing, and eye protection. Immediately cool cylinders with water spray from maximum distance, then
move them away from fire if without risk. If cylinders are leaking, reduce toxic vapors with water spray or
fog. Shut off leak if without risk. Reverse flow into cylinders may cause rupture. On-site fire brigades must
comply with OSHA 29 CFR 1910.156.
UNUSUAL FIRE AND EXPLOSION HAZARDS: Heat of fire can build pressure in cylinder and cause
it to rupture; no part of cylinder should be subjected to a temperature higher than 125掳F (52掳C). Hydrogen
Chloride cylinders are equipped with a pressure relief device. (Exceptions may exist where authorized by
DOT.) Liquid and vapors are extremely irritating and may burn skin and eyes on contact. Contact with
most metals in the presence of moisture produces flammable hydrogen.
HAZARDOUS COMBUSTION PRODUCTS: None known.
6. Accidental Release Measures
STEPS TO BE TAKEN IF MATERIAL IS RELEASED OR SPILLED:
DANGER! Corrosive, toxic, high-pressure liquid and gas (see section 3). Immediately evacuate all
personnel from danger area. Do not approach area without self-contained breathing apparatus and
protective clothing. Reduce vapors with fog or fine water spray. Shut off flow if without risk. Ventilate
area or move cylinder to a well-ventilated area. Prevent runoff from contaminating surrounding
environment. Toxic, corrosive vapors may spread from spill. Before entering area, especially a confined
area, check atmosphere with an appropriate device. Reverse flow into cylinder may cause rupture.
WASTE DISPOSAL METHOD: Prevent waste from contaminating the surrounding environment. Keep
personnel away. Discard any product, residue, disposable container or liner in an environmentally
acceptable manner, in full compliance with federal, state, and local regulations. If necessary, call your local
supplier for assistance.
7. Handling and Storage
PRECAUTIONS TO BE TAKEN IN STORAGE: Store and use with adequate ventilation. Firmly
secure cylinders upright to keep them from falling or being knocked over. Screw valve protection cap firmly
in place by hand. Store only where temperature will not exceed 125掳F (52掳C). Store full and empty
cylinders separately. Use a first-in, first-out inventory system to prevent storing full cylinders for long
periods.
PRECAUTIONS TO BE TAKEN IN HANDLING: Protect cylinders from damage. Use a suitable hand
truck to move cylinders; do not drag, roll, slide, or drop. Never attempt to lift a cylinder by its cap; the cap
is intended solely to protect the valve. Never insert an object (e.g., wrench, screwdriver, pry bar) into cap
Page 3 of 8
Product: Hydrogen Chloride Form No.: P-4606-C Date: October 1997
openings; doing so may damage the valve and cause a leak. Use an adjustable strap wrench to remove
over-tight or rusted caps. Open valve slowly. If valve is hard to open, discontinue use and contact your
supplier. For other precautions in using hydrogen chloride, see section 16.
For additional information on storage and handling, refer to Compressed Gas Association (CGA) pamphlet
P-1, "Safe Handling of Compressed Gases in Containers," available from the CGA. Refer to section 16 for
the address and phone number along with a list of other available publications.
8. Exposure Controls/Personal Protection
VENTILATION/ENGINEERING CONTROLS:
LOCAL EXHAUST鈥揢se a corrosion-resistant system with sufficient air flow to keep the
hydrogen chloride concentration below the TLV in the worker's breathing zone.
MECHANICAL (general)鈥揘ot recommended as a primary ventilation system to control worker's
exposure.
SPECIAL鈥揂 corrosion-resistant, canopy type, forced-draft fume hood may be preferred for some
applications.
OTHER鈥揘one
RESPIRATORY PROTECTION: Use air-supplied respirators for concentrations up to 10 times the
applicable permissible exposure limit. For higher concentrations, a full-face, self-contained breathing
apparatus operated in the pressure demand mode is required. Select per OSHA 29 CFR 1910.134 and
ANSI Z88.2.
PROTECTIVE GLOVES: Wear work gloves for cylinder handling. Neoprene where needed.
EYE PROTECTION: Wear safety glasses when handling cylinders; vapor-proof goggles where needed.
Select per OSHA 29 CFR 1910.133.
OTHER PROTECTIVE EQUIPMENT: Metatarsal shoes for cylinder handling and protective clothing
where needed. Select per OSHA 29 CFR 1910.132 and 1910.133. Regardless of protective equipment,
never touch live electrical parts.
9. Physical and Chemical Properties
MOLECULAR WEIGHT: 36.465 EXPANSION RATIO: Not applicable
SPECIFIC GRAVITY (air=1): At 68掳F (20掳C) SOLUBILITY IN WATER: At 32掳F (0掳C) and
and 1 atm: 1.268 1 atm, wt/wt solution: .823
GAS DENSITY: At 70掳F (21.1掳C) and 1 atm: VAPOR PRESSURE: At 70掳F (21.1掳C): 613
0.0950 lb/ft3 (1.522 kg/m3) psig (4227 kPa abs)
PERCENT VOLATILES BY VOLUME: 100 EVAPORATION RATE (Butyl Acetate=1):
High
BOILING POINT (1 atm): -121掳F (-85掳C) pH: Not applicable
MELTING POINT (1 atm): -173.6掳F (-114.2掳C)
APPEARANCE, ODOR, AND STATE: Colorless gas at normal temperature and pressure;
pungent, suffocating odor. Produces white fumes in moist air
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Product: Hydrogen Chloride Form No.: P-4606-C Date: October 1997
10. Stability and Reactivity
STABILITY: Unstable Stable X
INCOMPATIBILITY (materials to avoid): Bases, unsaturated organics, most common metals and
their alloys, fluorine, metal carbides, metal acetylides, potassium permanganate, sulfuric acid
HAZARDOUS DECOMPOSITION PRODUCTS: Decomposition may produce hydrogen and
chlorine or chlorides.
HAZARDOUS POLYMERIZATION: May Occur Will Not Occur X
CONDITIONS TO AVOID: None known.
11. Toxicological Information
See section 3. One-hour rat LC50 value for hydrogen chloride is 3120 ppm.
12. Ecological Information
Hydrogen Chloride does not contain any Class I or Class II ozone-depleting chemicals. Hydrogen Chloride
is not listed as a marine pollutant by DOT.
13. Disposal Considerations
WASTE DISPOSAL METHOD: Keep waste from contaminating surrounding environment. Keep
personnel away. Do not dispose of unused quantities. Return cylinder to supplier.
14. Transport Information
DOT/IMO SHIPPING NAME: Hydrogen HAZARD CLASS: 2.3
chloride, anhydrous
IDENTIFICATION NUMBER: UN 1050 PRODUCT RQ: 5000 lbs (2270 Kg)
SHIPPING LABEL(s): TOXIC GAS, PLACARD (When required): TOXIC GAS,
CORROSIVE CORROSIVE
SPECIAL SHIPPING INFORMATION: Cylinders should be transported in a secure position, in a
well-ventilated vehicle. Cylinders transported in an enclosed, nonventilated compartment of a vehicle can
present serious safety hazards.
Additional Marking Requirement: Inhalation Hazard
Shipment of compressed gas cylinders that have been filled without the owner's consent is a violation of
federal law [49 CFR 173.301(b)].
15. Regulatory Information
The following selected regulatory requirements may apply to this product. Not all such requirements are
identified. Users of this product are solely responsible for compliance with all applicable federal, state, and
local regulations.
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Product: Hydrogen Chloride Form No.: P-4606-C Date: October 1997
U.S. FEDERAL REGULATIONS:
EPA (Environmental Protection Agency)
CERCLA: Comprehensive Environmental Response, Compensation, and Liability Act of
1980 (40 CFR Parts 117 and 302):
Reportable Quantity (RQ): 5000 lbs (2270 kg)
SARA: Superfund Amendment and Reauthorization Act:
SECTIONS 302/304: Require emergency planning based on Threshold Planning Quantity
(TPQ) and release reporting based on Reportable Quantities (RQ) of extremely hazardous
substances (40 CFR Part 355):
Threshold Planning Quantity (TPQ): 500 lbs (227 kg)
Extremely Hazardous Substances (40 CFR 355): None
SECTIONS 311/312: Require submission of Material Safety Data Sheets (MSDSs) and
chemical inventory reporting with identification of EPA hazard categories. The hazard
categories for this products are as follows:
IMMEDIATE: Yes PRESSURE: Yes
DELAYED: Yes REACTIVITY: Yes
FIRE: No
SECTION 313: Requires submission of annual reports of release of toxic chemicals that
appear in 40 CFR Part 372.
Hydrogen Chloride requires reporting under Section 313.
40 CFR 68: Risk Management Program for Chemical Accidental Release Prevention:
Requires development and implementation of risk management programs at facilities that
manufacture, use, store, or otherwise handle regulated substances in quantities that exceed
specified thresholds.
Hydrogen Chloride is listed as a regulated substance in quantities of 5000 lbs (2270 kg) or
greater.
TSCA: Toxic Substances Control Act: Hydrogen Chloride is listed on the TSCA inventory.
OSHA (OCCUPATIONAL SAFETY AND HEALTH ADMINISTRATION):
29 CFR 1910.119: Process Safety Management of Highly Hazardous Chemicals: Requires
facilities to develop a process safety management program based on Threshold Quantities (TQ)
of highly hazardous chemicals.
Hydrogen Chloride is listed in Appendix A as a highly hazardous chemical in quantities of
5000 pounds (2270 kg) or greater.
STATE REGULATIONS:
CALIFORNIA: This product is not listed by California under the Safe Drinking Water Toxic
Enforcement Act of 1986 (Proposition 65).
PENNSYLVANIA: This product is subject to the Pennsylvania Worker and Community
Right-To-Know Act (35 P.S. Sections 7301-7320).
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Product: Hydrogen Chloride Form No.: P-4606-C Date: October 1997
16. Other Information
Be sure to read and understand all labels and instructions supplied with all containers of this product.
OTHER HAZARDOUS CONDITIONS OF HANDLING, STORAGE, AND USE: Corrosive,
poisonous, high-pressure liquid and gas. Do not breathe gas. Do not get vapors or liquid in eyes, on skin,
or on clothing. (See section 3.) Have safety showers and eyewash fountains immediately available. Use
piping and equipment adequately designed to withstand pressures to be encountered. Prevent reverse flow.
Reverse flow into cylinder may cause rupture. Use a check valve or other protective device in any line or
piping from the cylinder. Store and use with adequate ventilation at all times. Use only in a sealed,
pressure-tight system designed to prevent escape of product to the air. This system must be constructed of
corrosion-resistant materials. Close valve after each use; keep closed even when empty. Never work on a
pressurized system. If there is a leak, close the cylinder valve. Blow the system down in an environmentally
safe manner in compliance with all federal, state, and local laws, then repair the leak. Never ground a
compressed gas cylinder or allow it to become part of an electrical circuit.
Recommended Equipment: In semiconductor process gas and other suitable applications, Praxair
recommends the use of engineering controls such as gas cabinet enclosures, automatic gas panels (used to
purge systems on cylinder changeout), excess-flow valves throughout the gas distribution system, double
containment for the distribution system, and continuous gas monitors.
NOTE: Prior to using any plastics, confirm their compatibility with hydrogen chloride.
MIXTURES: When you mix two or more gases or liquefied gases, you can create additional, unexpected
hazards. Obtain and evaluate the safety information for each component before you produce the mixture.
Consult an industrial hygienist, or other trained person when you evaluate the end product. Remember,
gases and liquids have properties that can cause serious injury or death.
HAZARD RATING SYSTEMS:
NFPA RATINGS: HMIS RATINGS:
HEALTH =3 HEALTH =1
FLAMMABILITY =0 FLAMMABILITY = 0
REACTIVITY =0 REACTIVITY =0
SPECIAL None
STANDARD VALVE CONNECTIONS FOR U.S. AND CANADA:
CGA-330 connection is standard.
THREADED:
Not applicable
PIN-INDEXED YOKE:
ULTRA-HIGH-INTEGRITY
CGA-634
CONNECTION:
Use the proper CGA connections. DO NOT USE ADAPTERS. Additional limited-standard
connections may apply. See CGA Pamphlet V-1 listed below.
Ask your supplier about free Praxair safety literature as referenced on the label for this product; you may
also obtain copies by calling 1-800-PRAXAIR. Further information about hydrogen chloride can be found
Page 7 of 8
Product: Hydrogen Chloride Form No.: P-4606-C Date: October 1997
in the following pamphlets published by the Compressed Gas Association, Inc. (CGA), 1725 Jefferson
Davis Highway, Arlington, VA 22202-4102, Telephone (703) 412-0900.
AV-1 Safe Handling and Storage of Compressed Gases
P-1 Safe Handling of Compressed Gases in Containers
V-1 Compressed Gas Cylinder Valve Inlet and Outlet Connections
--- Handbook of Compressed Gases, Third Edition
Praxair asks users of this product to study this Material Safety Data Sheet (MSDS) and become aware of
product hazards and safety information. To promote safe use of this product, a user should (1) notify
employees, agents and contractors of the information on this MSDS and of any other known product
hazards and safety information, (2) furnish this information to each purchaser of the product, and (3) ask
each purchaser to notify its employees and customers of the product hazards and safety information.
The opinions expressed herein are those of qualified experts within Praxair, Inc.
We believe that the information contained herein is current as of the date of this
Material Safety Data Sheet. Since the use of this information and the conditions of
use of the product are not within the control of Praxair, Inc., it is the user's
obligation to determine the conditions of safe use of the product.
Praxair MSDSs are furnished on sale or delivery by Praxair or the independent distributors and
suppliers who package and sell our products. To obtain current Praxair MSDSs for these products,
contact your Praxair sales representative or local distributor or supplier. If you have questions
regarding Praxair MSDSs, would like the form number and date of the latest MSDS, or would like the
names of the Praxair suppliers in your area, phone or write the Praxair Call Center (Phone:
1-800-PRAXAIR; Address: Praxair Call Center, Praxair, Inc., PO Box 44, Tonawanda, NY
14150-7891).
Praxair is a trademark of Praxair Technology, Inc.
Praxair, Inc.
39 Old Ridgebury Road
Danbury CT 06810-5113
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