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NIOSH

ISOBUTANE

ICSC: 0901

2-Methylpropane
1,1-Dimethylethane
Trimethylmethane
C4H10 / (CH3)2CHCH3
Molecular mass: 58.1
(cylinder)
ICSC # 0901 		CAS # 75-28-5
RTECS # TZ4300000
UN # 1969
EC # 601-004-00-0
November 25, 1998 Validated

TYPES OF HAZARD/ EXPOSURE

ACUTE HAZARDS/ SYMPTOMS

PREVENTION

FIRST AID/
FIRE FIGHTING

FIRE Extremely flammable.
NO open flames, NO sparks, and NO smoking.
Shut off supply; if not possible and no risk to surroundings, let the fire burn itself out; in other cases extinguish with water spray.
EXPLOSION Gas/air mixtures are explosive.
Closed system, ventilation, explosion-proof electrical equipment and lighting. Prevent build-up of electrostatic charges (e.g., by grounding) if in liquid state.
In case of fire: keep cylinder cool by spraying with water. Combat fire from a sheltered position.
EXPOSURE


•INHALATION Shortness of breath. Suffocation.
Ventilation, local exhaust, or breathing protection.
Fresh air, rest. Refer for medical attention.
•SKIN ON CONTACT WITH LIQUID: FROSTBITE.
Cold-insulating gloves. Protective clothing.
ON FROSTBITE: rinse with plenty of water, do NOT remove clothes. Refer for medical attention.
•EYES
Safety goggles, face shield.
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then take to a doctor.
•INGESTION
Do not eat, drink, or smoke during work.

SPILLAGE DISPOSAL

STORAGE

PACKAGING & LABELLING

Evacuate danger area! Consult an expert! Ventilation. Remove all ignition sources. NEVER direct water jet on liquid. (Extra personal protection: filter respirator for organic vapours of low boiling compounds).
Fireproof. Cool.

Note: C
F+ symbol
R: 12
S: 2-9-16
UN Hazard Class: 2.1
ICSC: 0901 Prepared in the context of cooperation between the International Programme on Chemical Safety & the Commission of the European Communities (C) IPCS CEC 1994. No modifications to the International version have been made except to add the OSHA PELs, NIOSH RELs and NIOSH IDLH values.

ISOBUTANE

ICSC: 0901

I

M

P

O

R

T

A

N

T


D

A

T

A

PHYSICAL STATE; APPEARANCE:
COLOURLESS COMPRESSED LIQUEFIED GAS , WITH CHARACTERISTIC ODOUR.

PHYSICAL DANGERS:
The gas is heavier than air and may travel along the ground; distant ignition possible. As a result of flow, agitation, etc., electrostatic charges can be generated.

CHEMICAL DANGERS:
Reacts with strong oxidants, acetylene, halogens and nitrogen oxides causing fire and explosion hazard.

OCCUPATIONAL EXPOSURE LIMITS:
TLV: (Aliphatic hydrocarbon gases, Alkane C1-C4) 1000 ppm
(as TWA)
(ACGIH 2006).
MAK: 1000 ppm, 2400 mg/m3;
Peak limitation category: II(4); Pregnancy risk group: D;
(DFG 2008).
OSHA PEL†: none
NIOSH REL: TWA 800 ppm (1900 mg/m3)
NIOSH IDLH: N.D. See: IDLH INDEX


ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation.

INHALATION RISK:
A harmful concentration of this gas in the air will be reached very quickly on loss of containment.

EFFECTS OF SHORT-TERM EXPOSURE:
Rapid evaporation of the liquid may cause frostbite. The substance may cause effects on the cardiovascular system , resulting in impaired functions and respiratory failure. Exposure at high level may result in death.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:

PHYSICAL
PROPERTIES

Boiling point: -12°C
Melting point: -160°C
Relative density (water = 1): 0.6 (when liquid)
Solubility in water, g/100 ml at 20°C: none
Vapour pressure, kPa at 20°C: 304
Relative vapour density (air = 1): 2
Flash point: Flammable Gas
Auto-ignition temperature: 460°C
Explosive limits, vol% in air: 1.8-8.4
Octanol/water partition coefficient as log Pow: 2.8

ENVIRONMENTAL
DATA


N O T E S

Turn leaking cylinder with the leak up to prevent escape of gas in liquid state. The measures mentioned in section PREVENTION are applicable to production, filling of cylinders, and storage of the gas.
Transport Emergency Card: TEC (R)-501

NFPA Code: H1; F4; R0;
Card has been partially updated in November 2008: see Occupational Exposure Limits.

ADDITIONAL INFORMATION



ICSC: 0901 ISOBUTANE
(C) IPCS, CEC, 1994
IMPORTANT LEGAL NOTICE: Neither NIOSH, the CEC or the IPCS nor any person acting on behalf of NIOSH, the CEC or the IPCS is responsible for the use which might be made of this information. This card contains the collective views of the IPCS Peer Review Committee and may not reflect in all cases all the detailed requirements included in national legislation on the subject. The user should verify compliance of the cards with the relevant legislation in the country of use. The only modifications made to produce the U.S. version is inclusion of the OSHA PELs, NIOSH RELs and NIOSH IDLH values.
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