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• Material Safety Data Sheet No. 674 from Geniumrs Reference Collection ISOBITI'YI.ENE Genium Publishing Corporation 1145 Catalyn Street Schenectady,NY 12303-1836 USA 15P Issued. November 1988 518 377.8855 GE14UM PUtitisiuraa CORP. SECTION,-- >MATERIALf U vA .=A v T 7., , - 27 Material Name: ISOBUT ILENE 4 Description(OrlgimUses): Obtained from refinery steams by absorption on 65%sulfunc acid( so) x 0 at 59-F(15'C).Used pnmarily to produce dusobutylene,trimers,butyl rubber,and other polymers,also used to produce an4ox1dants for foods,plastics,and packaging food supplements. NFPA ' Other Designations+ Isobutene,2-Methylpropene;gamma-Butylene;CI-I3=C(CH)=;CAS No 0115-11-7 HMIs H 1 R 1 Manufacturer: Contac your supplier or distributor Consult the latest edition of the Chenuculweek R 0 I I Buyers'Guide(Gemum ref 73) for a last of suppliers. ppG. S I 1 :SECTION-2 INGREDIENTS~AMID HA ZARDS� `�>�t 8 K 4 A <�lo:4: r <.AEXPOSIIRE-,LIMITS", ` Isobutylene,CAS No 0115-11-57 Ca 100 OSHA PEL None Established ACGM TLV,1988-89 None Established MOSH REL None Established Toxicity Data* Rat,Inhalation,LC,; 620 gfm'(4 Hrs) •Momtor NIOS RTF.C.S Mouse,Inhalation,LC,: 415 gle(2 Hrs) ' II, (UD0890000),for additional data. rSECTION%3 b PHYSICAL- DATA 4'v" ♦{ Ov ve t{~ ^' �} 77"', 7 , S'1�`V Y h •�. Boiling Polnt: -19 67(-6 9TC) Molecular Weight: 56 Gmmstmole Melting Point: -220T(-140.0 Solubility In Water(%): Insoluble* Vapor Density(Air=1): I.9 %Volatile by Volume: 100 Specific Gravity(Ii.O=1): Ca 0.6 Appeamnoe and Odor. A colorless,extremely flammable gas,oder not luted. *Isobutylene is very soluble in alcohol,ether,and sulfunc acid -SECTION-4 A`F'IRE ArID EXPLOSION'=DATAV 7 7 Flash Point* Autos nitron Temperature: 8697(465'C) LEL- 18%v/v UEL: 9 6%wv Extinguishing Media: Isobutylene gas is an extremely flammable gas that has a substantial explosive aw-gas range.For isobutylene fu=, the recommended fare-fighting technique is to stop the flow of gas instead of extinguishing the fire.If the flames are extinguished and the isobutylene gas continues to escape or leak,an explosive air-gas mixture can form quickly and ignite without warning A resulting explosion could cause greater damage than that which would be caused by allowing the fisc to burn itself out If the fire must be extinguished to allow safe access to shutoff valves,recommended extinguishing agents include CO,and dry chemical Unusual Fire or Explosion Hazards, In many cases,the preferred strategy is to allow the flames to continue to burn and to cool the surroundings with water spray to prevent ignition of nearby combustibles lsobutylene gas is heavier than air and can collect in low-lying,confined spaces Potentially explosive air-gas =xtures are especially lilcely to build up in such an area,so enter it with extreme caution whether or not it is presently involved in a fire Possible sources of ignition must not be brought into any area suspected of containing substantial concentrations of Isobutylene gas Special Fire-fighting Procedures: Wear a self-contained breathing apparatus(SOBA)with a full facepiece operated in the pressure-demand or Positive-pressure mode •Sax(Genium ref 6)reports a flash point of-1057(-76'C)for Isobutylene SECTION -5.- REACTIVITY DATA Stabillty/Polymeriration: Isobutylene is stable in closed,pressunzed containers during routine operations at mom temperature. Hazardous polymenzation cannotoccur Chemlcal Incompatibilities: Isobutylene can react dangerously with strong oxidizing matenals- Conditions to Avoid. Prevent exposing isobutylenc to any source of ignition such as an open flame,sparks,lighted tobacco products,ar ' steam Imes Hazardous Products of Decomposition: Isobutylene fires can produce toxic gases such as carbon monoxide(CO)or lower- molecular-weight hydrocarbons Comments: The extreme flammability of isobutylene means that any reactions involving this material. including nonhazardous ones,must be performed carnfuIly to Order to prevent fires and/or explosions SECTION 6. HEALTH HAZARD INFORMATION Carcinogenicity: Isobutylene is not listed as a carcinogen by the N7p.IARC,or OSHA Summary of Risks Isobutylene is a simple asphyxiant.As such it will not cause significant physiological responses.but it can displace the minimum required atmosphenc oxygen level Significant displacement by Isobutylene results in an oxygen-deficient atmosphere with W adequate warping properties Asphyuation fatalities can occur especially in confined, low-lying,poorly ventilated spaces because isobuty- COPyrisM 0 1998 by Oetl.=Nbiftiml Cwp"etim