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DIACETONE ALCOHOL ICSC: 0647
Date of Peer Review: April 2005

4-Hydroxy-4-methylpentan-2-one
2-Pentanone, 4-hydroxy-4-methyl-
4-Hydroxy-2-keto-4-methylpentane
4-Hydroxy-4-methyl-2-pentanone
CAS # 123-42-2 C6H12O2 / (CH3)2C(OH)CH2COCH3
RTECS # SA9100000 Molecular mass: 116.2
UN # 1148
EC # 603-016-00-1
TYPES OF HAZARD / EXPOSURE ACUTE HAZARDS / SYMPTOMS PREVENTION FIRST AID / FIRE FIGHTING
FIRE Flammable. See Notes.
NO open flames, NO sparks, and NO smoking.
Water spray. Alcohol-resistant foam. Dry powder. Carbon dioxide.
EXPLOSION Above 58C explosive vapour/air mixtures may be formed. (See Notes.)
Above 58C use a closed system, ventilation, and explosion-proof electrical equipment. Use non-sparking handtools.
In case of fire: keep drums, etc., cool by spraying with water.
EXPOSURE


Inhalation Cough. Sore throat.
Ventilation, local exhaust, or breathing protection.
Fresh air, rest.
Skin Redness. Dry skin. MAY BE ABSORBED!
Protective gloves. Protective clothing.
Remove contaminated clothes. Rinse and then wash skin with water and soap.
Eyes Redness. Pain.
Safety goggles.
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.
Rinse mouth. Do NOT induce vomiting. Give plenty of water to drink. Refer for medical attention.
SPILLAGE DISPOSAL PACKAGING & LABELLING
Remove all ignition sources. Personal protection: filter respirator for organic gases and vapours. Cover the spilled material with absorbent. Carefully collect remainder.
EU Classification
Symbol: Xi
R: 36
S: (2-)-24/25
UN Classification
UN Hazard Class: 3
UN Pack Group: III
EMERGENCY RESPONSE STORAGE
Transport Emergency Card: TEC (R)-30GF1-III
NFPA Code: H1; F2; R0;
Fireproof. Separated from acids, bases, amines and oxidants.
IPCS
International
Programme on
Chemical Safety
Prepared in the context of cooperation between the International Programme on Chemical Safety and the Commission of the European Communities IPCS, CEC 1999

SEE IMPORTANT INFORMATION ON BACK
DIACETONE ALCOHOL ICSC: 0647
IMPORTANT DATA
PHYSICAL STATE; APPEARANCE:
COLOURLESS LIQUID, WITH CHARACTERISTIC ODOUR.

CHEMICAL DANGERS:
The substance decomposes on heating or on burning or on contact with acids, bases and amines producing acetone and mesityl alcohol. Reacts violently with oxidants forming flammable/explosive gas (hydrogen - see ICSC0001)

OCCUPATIONAL EXPOSURE LIMITS:
TLV: 50 ppm as TWA; (ACGIH 2005).
MAK: 20 ppm, 96 mg/m; Peak limitation category: I(2); skin absorption (H); Pregnancy risk group: IIc; (DFG 2004).
ROUTES OF EXPOSURE:
The substance can be absorbed into the body by inhalation of its vapour, through the skin and by ingestion.

INHALATION RISK:
A harmful contamination of the air will not or will only very slowly be reached on evaporation of this substance at 20C.

EFFECTS OF SHORT-TERM EXPOSURE:
The substance is irritating to the eyes, the skin and the respiratory tract. If this liquid is swallowed, aspiration into the lungs may result in chemical pneumonitis. Exposure farabove the OEL may result in lowering of consciousness.

EFFECTS OF LONG-TERM OR REPEATED EXPOSURE:
The liquid defats the skin.
PHYSICAL PROPERTIES
Boiling point: 169-171C
Melting point: -47C
Relative density (water = 1): 0.93
Solubility in water: miscible
Vapour pressure, kPa at 20C: 0.108
Relative vapour density (air = 1): 4.0
Relative density of the vapour/air-mixture at 20C (air = 1): 1.0048
Flash point: 58C c.c.
Auto-ignition temperature: 640C
Explosive limits, vol% in air: 1.8-6.9
Octanol/water partition coefficient as log Pow: -0.14 to 1.03 (calculated)
ENVIRONMENTAL DATA

NOTES
This card is only valid for the pure substance.The technical product may contain up to 5% acetone (see ICSC0087), resulting in high flammability. Other UN Classification for technical product: UN hazard class 3, UN pack group II.
ADDITIONAL INFORMATION


LEGAL NOTICE Neither the CEC nor the IPCS nor any person acting on behalf of the CEC or the IPCS is responsible for the use which might be made of this information
IPCS, CEC 1999