Product: Isobutylene
`
`
`P-4614-D
`
`Date: December 2009
`
`Praxair Material Safety Data Sheet
`
`1. Chemical Product and Company Identification
`
`Trade Names: Isobutylene
`Product Name: Isobutylene (MSDS No. P-4614-D)
`Synonyms: Isobutene, methylpropene
`Chemical Name: 2-Methylpropene
`Product Grades: 2.0, 3.0 - Research
`Chemical Family: Alkene
`Telephone: Emergencies: 1-800-645-4633* Company Name: Praxair, Inc.
`
`CHEMTREC: 1-800-424-9300*
`39 Old Ridgebury Road
`
`Routine:
`1-800-PRAXAIR
`Danbury, CT 06810-5113
`* 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. Hazards Identification
`
` EMERGENCY OVERVIEW
`DANGER! Flammable liquid and gas under pressure.
`Can form explosive mixtures with air.
`May cause frostbite.
`May cause dizziness and drowsiness.
`Self-contained breathing apparatus and protective clothing
`may be required by rescue workers.
`Under ambient conditions, this product is a colorless gas with a
`mild, sweetish odor.
`OSHA REGULATORY STATUS: This material is considered hazardous by the OSHA Hazard
`Communications Standard (29 CFR 1910.1200).
`POTENTIAL HEALTH EFFECTS:
`Effects of a Single (Acute) Overexposure
`Inhalation. May be mildly irritating to mucous membranes. At high concentrations, may
`cause drowsiness. At very high concentrations, may act as an asphyxiant and cause
`headache, drowsiness, dizziness, excitation, excess salivation, vomiting, and
`unconsciousness. Lack of oxygen can kill.
`Skin Contact. No harm expected from gas. Liquid may cause frostbite, a cryogenic injury
`resembling a burn.
`Swallowing. An unlikely route of exposure, but frostbite of the lips and mouth may result
`from contact with the liquid.
`Eye Contact. Liquid may cause frostbite.
`Effects of Repeated (Chronic) Overexposure. Repeated or prolonged exposure may cause
`dermatitis.
`
`
`
`Copyright © 1979, 1985, 1998, 2006, 2009, Praxair Technology, Inc.
`All rights reserved.
`A vertical line in the left margin indicates revised or new material.
`
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`Page 1 of 8
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`BUTAMAX 1047
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`

`

`Product: Isobutylene
`
`
`P-4614-D
`
`Date: December 2009
`
`Other Effects of Overexposure. This product is an asphyxiant. Lack of oxygen can kill.
`Medical Conditions Aggravated by Overexposure. The defatting properties of isobutylene
`may aggravate an existing dermatitis.
`CARCINOGENICITY: Isobutylene is not listed by NTP, OSHA, or IARC.
`POTENTIAL ENVIRONMENTAL EFFECTS: For further information, see section 12, Ecological
`Information.
`
`3. Composition/Information on Ingredients
`See section 16 for important information about mixtures.
`
`COMPONENT
`Isobutylene
` *The symbol > means “greater than.”
`
`CAS NUMBER
`115-11-7
`
`CONCENTRATION
`>99%*
`
`4. First Aid Measures
`INHALATION: Immediately remove to fresh air. If not breathing, give artificial respiration. If
`breathing is difficult, qualified personnel may give oxygen. Call a physician.
`SKIN CONTACT: For exposure to liquid, immediately warm frostbite area with warm water not
`to exceed 105°F (41°C). In case of massive exposure, remove clothing while showering with
`warm water for at least 15 minutes. Call a physician.
`SWALLOWING: An unlikely route of exposure. This product is a gas at normal temperature
`and pressure.
`EYE CONTACT: Immediately flush eyes thoroughly with warm 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: This material may be a cardiac sensitizer; avoid the use of
`epinephrine. There is no specific antidote. Treatment of overexposure should be directed at
`the control of symptoms and the clinical condition of the patient.
`
`5. Fire Fighting Measures
`FLAMMABLE PROPERTIES: Flammable gas. Forms explosive mixtures with air and oxidizing
`agents. Heat of fire can build pressure in cylinder and cause it to rupture.
`SUITABLE EXTINGUISHING MEDIA: CO2, dry chemicals, water spray, or fog.
`PRODUCTS OF COMBUSTION: Carbon monoxide, carbon dioxide
`PROTECTION OF FIREFIGHTERS: DANGER! Flammable liquid and gas under pressure.
`Evacuate all personnel from danger area. Immediately cool cylinders with water spray from
`maximum distance, taking care not to extinguish flames. Remove ignition sources if without
`risk. If flames are accidentally extinguished, explosive re-ignition may occur. Use self-
`contained breathing apparatus and protective clothing. Stop flow of gas if without risk while
`continuing cooling water spray. Remove all cylinders from area of fire if without risk. Allow fire
`to burn out. On-site fire brigades must comply with OSHA 29 CFR 1910.156.
`Specific Physical and Chemical Hazards. Isobutylene cylinders are equipped with a
`pressure-relief device. (Exceptions may exist where authorized by DOT.) No part of a cylinder
`
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`Page 2 of 8
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`

`

`Product: Isobutylene
`
`
`P-4614-D
`
`Date: December 2009
`
`should be subjected to a temperature higher than 125°F (52°C). If venting or leaking
`isobutylene catches fire, do not extinguish flames. Flammable vapors may spread from leak,
`creating an explosive re-ignition hazard. Vapors can be ignited by pilot lights, other flames,
`smoking, sparks, heaters, electrical equipment, static discharge, or other ignition sources at
`locations distant from product handling point. Explosive atmospheres may linger. Before
`entering area, especially confined areas, check atmosphere with approved explosion meter.
`Protective Equipment and Precautions for Firefighters. Firefighters should wear self-
`contained breathing apparatus and full fire-fighting turnout gear.
`
`6. Accidental Release Measures
`STEPS TO BE TAKEN IF MATERIAL IS RELEASED OR SPILLED:
`DANGER! Flammable liquid and gas under pressure.
`Personal Precautions. Forms explosive mixtures with air. Immediately evacuate all personnel
`from danger area. Use self-contained breathing apparatus and protective clothing where
`needed. Remove all sources of ignition if without risk. Reduce vapors with fog or fine water
`spray. Shut off flow if without risk. Ventilate area or move leaking cylinder to well-ventilated
`area. Flammable gas may spread from leak. Before entering area, especially confined areas,
`check atmosphere with an appropriate device.
`Environmental Precautions. 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 HANDLING: Protect cylinders from damage. Use a suitable
`hand truck to move cylinders; do not drag, roll, slide, or drop. Keep away from heat, sparks,
`and open flame. Use only spark-proof tools and explosion-proof equipment. Leak check with
`soapy water; never use a flame. 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
`openings; doing so may damage the valve and cause a leak. Use an adjustable strap wrench to
`remove over-tight or rusted caps. Slowly open valve. If valve is hard to open, discontinue use
`and contact your supplier. Close cylinder valve when not in use; keep closed even when empty.
`PRECAUTIONS TO BE TAKEN IN STORAGE: Store and use with adequate ventilation.
`Separate cylinders from oxygen and other oxidizers by at least 20 ft (6.1 m), or use a barricade
`of noncombustible material. This barricade should be at least 5 ft (1.53 m) high and have a fire
`resistance rating of at least ½ hour. Firmly secure cylinders upright to keep them from falling or
`being knocked over. Isobutylene cylinders designed to accept a valve protection cap must be
`provided with a cap. Screw cap firmly in place by hand. Post "No Smoking or Open Flames"
`signs in storage and use areas. There must be no sources of ignition. All electrical equipment
`in storage areas must be explosion-proof. Storage areas must meet national electric codes for
`Class 1 hazardous areas. Store only where temperature will not exceed 125°F (52°C). Store
`full and empty cylinders separately. Use a first-in, first-out inventory system to prevent storing
`full cylinders for long periods.
`RECOMMENDED PUBLICATIONS: For further information on storage, handling, and use, see
`Praxair publication P-14-153, Guidelines for Handling Gas Cylinders and Containers. Obtain
`from your local supplier.
`
`
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`Page 3 of 8
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`

`Product: Isobutylene
`
`
`P-4614-D
`
`Date: December 2009
`
`8. Exposure Controls/Personal Protection
`
`ACGIH TLV-TWA (2009)
`OSHA PEL
`COMPONENT
`250 ppm
`Not Established.
`Isobutylene
`TLV-TWAs should be used as a guide in the control of health hazards and not as fine lines
`between safe and dangerous concentrations.
`IDLH = Not available.
`ENGINEERING CONTROLS:
`Local Exhaust. Use an explosion-proof local exhaust system.
`Mechanical (General). Inadequate. See SPECIAL.
`Special. Use only in a closed system.
`Other. None
`PERSONAL PROTECTIVE EQUIPMENT:
`Skin Protection. Wear work gloves when handling cylinders, neoprene gloves where contact
`with product may occur. Metatarsal shoes for cylinder handling, protective clothing where
`needed. Select in accordance with OSHA 29 CFR 1910.132 and 1910.133. Regardless of
`protective equipment, never touch live electrical parts.
`Eye/Face Protection. Select in accordance with OSHA 29 CFR 1910.133.
`Respiratory Protection. A respiratory protection program that meet OSHA 29 CFR 1910.134,
`ANSI Z88.2, or MSHA 30 CFR 72.710 (where applicable) requirements must be followed
`whenever workplace conditions warrant respirator use. Use an air-supplied or air-purifying
`cartridge if the action level is exceeded. Ensure the respirator has the appropriate protection
`factor for the exposure level. If cartridge type respirators are used, the cartridge must be
`appropriate for the chemical exposure (e.g., an organic vapor cartridge). For emergencies or
`instances with unknown exposure levels, use a self-contained breathing apparatus.
`
`9. Physical and Chemical Properties
`
`APPEARANCE:
`ODOR:
`ODOR THRESHOLD:
`PHYSICAL STATE:
`pH:
`FREEZING POINT at 1 atm:
`BOILING POINT at 1 atm:
`FLASH POINT (test method):
`EVAPORATION RATE (Butyl Acetate = 1):
`FLAMMABILITY:
`FLAMMABLE LIMITS IN AIR, % by volume:
`VAPOR PRESSURE at 70°F (21.1°C)
`VAPOR DENSITY at 70°F (21.1°C) and 1 atm:
`SPECIFIC GRAVITY (Air = 1) at 70°F (21.1°C)
`and 1 atm:
`
`Colorless gas
`Mildly sweetish
`Not available.
`Gas at normal temperature and pressure
`Not applicable.
`-220.61°F (-140.34°C)
`19.58°F (-6.9°C)
`-105°F (-76°C) TCC
`High
`Flammable
`LOWER: 1.8%
`23.85 psig (164.44 kPa)
`2.324 kg/cm3 (0.1451 lb/ft3)
`
`1.937
`
`UPPER: 8.8%
`
`
`
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`Page 4 of 8
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`

`

`Product: Isobutylene
`
`
`P-4614-D
`
`Date: December 2009
`
`SOLUBILITY IN WATER at 77°F (25°C):
`PARTITION COEFFICIENT: n-octanol/water:
`AUTOIGNITION TEMPERATURE:
`DECOMPOSITION TEMPERATURE:
`PERCENT VOLATILES BY VOLUME:
`MOLECULAR WEIGHT:
`MOLECULAR FORMULA:
`
`263 ppm by (wt)
`2.34
`869°F (465°C)
`Not available.
`100
`56.108
`C4H8
`
`10. Stability and Reactivity
`
`CHEMICAL STABILITY:
`Stable
` Unstable
`CONDITIONS TO AVOID: Elevated temperatures and/or the presence of a catalyst
`INCOMPATIBLE MATERIALS: Oxidizing agents, halogens, acids
`HAZARDOUS DECOMPOSITION PRODUCTS: Thermal decomposition or burning produces
`carbon monoxide and carbon dioxide.
`POSSIBILITY OF HAZARDOUS REACTIONS:
`Will Not Occur
`May Occur
`Thermal decomposition or burning produces carbon monoxide and carbon dioxide.
`
`11. Toxicological Information
`ACUTE DOSE EFFECTS: None known.
`STUDY RESULTS: None known.
`
`12. Ecological Information
`ECOTOXICITY: No known effects.
`OTHER ADVERSE EFFECTS: This product does not contain any Class I or Class II ozone-
`depleting chemicals.
`
`13. Disposal Considerations
`WASTE DISPOSAL METHOD: Do not attempt to dispose of residual or unused quantities.
`Return cylinder to supplier.
`
`14. Transport Information
`
`DOT/IMO SHIPPING NAME:
`HAZARD
`PACKING
`
`CLASS:
`GROUP/Zone:
`2.1
`
`Isobutylene
`IDENTIFICATION
`
`NUMBER:
`NA*
`
`
`UN1055
`
`PRODUCT
`RQ:
`
`SHIPPING LABEL(s):
`PLACARD (when required):
`*NA – Not Applicable.
`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.
`
`FLAMMABLE GAS
`FLAMMABLE GAS
`
`
`Not
`applicable
`
`
`
`
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`Page 5 of 8
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`

`

`Product: Isobutylene
`
`
`P-4614-D
`
`Date: December 2009
`
`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)].
`MARINE POLLUTANTS: Isobutylene is not listed as a marine pollutant by DOT.
`
`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.
`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): None
`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 (EHS) (40 CFR Part 355):
`TPQ: None
`EHS RQ (40 CFR 355): None
`SECTIONS 311/312: Require submission of MSDSs and reporting of chemical
`inventories with identification of EPA hazard categories. The hazard categories for
`this product are as follows:
`PRESSURE: Yes
`IMMEDIATE: Yes
`REACTIVITY: No
`DELAYED: Yes
`FIRE: Yes
`
`SECTION 313: Requires submission of annual reports of release of toxic chemicals
`that appear in 40 CFR Part 372.
`Isobutylene is not subject to 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.
`Isobutylene is listed as a regulated substance in quantities of 10,000 lbs (4536 kg) or
`greater.
`TSCA: TOXIC SUBSTANCES CONTROL ACT: Isobutylene 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.
`Isobutylene is not listed in Appendix A as a highly hazardous chemical. However,
`any process that involves a flammable gas on site in one location in quantities of
`10,000 lbs (4536 kg) or greater is covered under this regulation unless the gas is
`used as a fuel.
`
`
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`Page 6 of 8
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`

`Product: Isobutylene
`
`
`P-4614-D
`
`Date: December 2009
`
`STATE REGULATIONS:
`CALIFORNIA: Isobutylene is not listed by California under the SAFE DRINKING WATER
`AND TOXIC ENFORCEMENT ACT OF 1986 (Proposition 65).
`PENNSYLVANIA: Isobutylene is subject to the PENNSYLVANIA WORKER AND
`COMMUNITY RIGHT-TO-KNOW ACT (35 P.S. Sections 7301-7320).
`
`16. Other Information
`Read and understand all labels and instructions supplied with all containers of this product.
`OTHER HAZARDOUS CONDITIONS OF HANDLING, STORAGE, AND USE: Flammable
`liquid and gas under pressure. Use piping and equipment adequately designed to withstand
`pressures to be encountered. Use a backflow device in any piping. All piped systems and
`associated equipment must be grounded. Electrical equipment must be non-sparking or
`explosion-proof. Use only in a closed system. Gas can cause rapid suffocation due to oxygen
`deficiency. Store and use with adequate ventilation. Never work on a pressurized system. If
`there is a leak, blow the system down in an environmentally safe manner in compliance with all
`federal, state, and local laws; then repair the leak. Never place a compressed gas cylinder
`where it may become part of an electrical circuit.
`NOTE: Prior to using any plastics, confirm their compatibility with isobutylene.
`Mixtures. When you mix two or more chemicals, 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, chemicals have properties that can cause serious injury or death.
`HAZARD RATING SYSTEMS:
`NFPA RATINGS:
`
`= 2
`HEALTH
`= 4
`FLAMMABILITY
`= 1
`INSTABILITY
`= None
`SPECIAL
`STANDARD VALVE CONNECTIONS FOR U.S. AND CANADA:
`THREADED:
`CGA-510.
`PIN-INDEXED YOKE:
`Not applicable.
`ULTRA-HIGH-INTEGRITY CONNECTION:
`Not applicable.
`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 referred to in this MSDS and on the
`label for this product. Further information can be found in the following pamphlets published
`by the Compressed Gas Association, Inc. (CGA), 4221 Walney Road, 5th Floor, Chantilly,
`VA 20151-2923, Telephone (703) 788-2700, http://www.cganet.com/Publication.asp.
`
`HMIS RATINGS:
`
`= 1
`HEALTH
`= 4
`FLAMMABILITY
`PHYSICAL HAZARD = 2
`
`AV-1
`P-1
`P-14
`SB-2
`V-1
`—
`
`Safe Handling and Storage of Compressed Gases
`Safe Handling of Compressed Gases in Containers
`Accident Prevention in Oxygen-Rich, Oxygen-Deficient Atmospheres
`Oxygen-Deficient Atmospheres
`Compressed Gas Cylinder Valve Inlet and Outlet Connections
`Handbook of Compressed Gases, Fourth Edition
`
`
`
`
`
`Page 7 of 8
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`

`

`Product: Isobutylene
`
`
`P-4614-D
`
`Date: December 2009
`
`Praxair asks users of this product to study this 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 in 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.
`
`
`
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`
`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 MSDSs for these products, contact your Praxair
`sales representative or local distributor or supplier, or download from www.praxair.com. 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 14151-0044).
`Praxair and the Flowing Airstream design are trademarks or registered trademarks of
`Praxair Technology, Inc. in the United States and/or other countries.
`
`
`
`Praxair, Inc.
`39 Old Ridgebury Road
`
`Danbury, CT 06810-5113
`
`
`
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`Page 8 of 8
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`Printed in USA
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