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Description References
Chemical Name:
mesityl;FEMA 3368;Mesityloxid;Mesityloxyde;MESITYL OXIDE;femanumber3368;mesityl oxnide;Mesityloxide 0;oxydedemesityle;MesitylOxide91%
Molecular Formula:
Formula Weight:
MOL File:


Melting point:
−53 °C(lit.)
Boiling point:
129 °C(lit.)
0.858 g/mL at 25 °C(lit.)
refractive index 
n20/D 1.442(lit.)
3368 | 4-METHYL-3-PENTEN-2-ONE
Flash point:
87 °F
storage temp. 
Flammables area
Liquid, Free Of Suspended Matter
explosive limit
Water Solubility 
28 G/L (20 ºC)
CAS DataBase Reference
141-79-7(CAS DataBase Reference)
NIST Chemistry Reference
3-Penten-2-one, 4-methyl-(141-79-7)
EPA Substance Registry System
3-Penten-2-one, 4-methyl-(141-79-7)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  Xn
Risk Statements  10-20/21/22-36/37/38
Safety Statements  25
RIDADR  UN 1229 3/PG 3
WGK Germany  1
RTECS  SB4200000
HazardClass  3
PackingGroup  III
Hazardous Substances Data 141-79-7(Hazardous Substances Data)
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H226 Flammable liquid and vapour Flammable liquids Category 3 Warning
H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501
H312 Harmful in contact with skin Acute toxicity,dermal Category 4 Warning P280,P302+P352, P312, P322, P363,P501
H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
H331 Toxic if inhaled Acute toxicity,inhalation Category 3 Danger P261, P271, P304+P340, P311, P321,P403+P233, P405, P501
H332 Harmful if inhaled Acute toxicity,inhalation Category 4 Warning P261, P271, P304+P340, P312
H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
H336 May cause drowsiness or dizziness Specific target organ toxicity,single exposure; Narcotic effects Category 3 Warning P261, P271, P304+P340, P312,P403+P233, P405, P501
H361 Suspected of damaging fertility or the unborn child Reproductive toxicity Category 2 Warning P201, P202, P281, P308+P313, P405,P501
Precautionary statements:
P201 Obtain special instructions before use.
P202 Do not handle until all safety precautions have been read and understood.
P210 Keep away from heat/sparks/open flames/hot surfaces. — No smoking.
P233 Keep container tightly closed.
P240 Ground/bond container and receiving equipment.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash hands thoroughly after handling.
P264 Wash skin thouroughly after handling.
P270 Do not eat, drink or smoke when using this product.
P271 Use only outdoors or in a well-ventilated area.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P311 Call a POISON CENTER or doctor/physician.
P303+P361+P353 IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P304+P340 IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P308+P313 IF exposed or concerned: Get medical advice/attention.
P370+P378 In case of fire: Use … for extinction.
P405 Store locked up.
P403+P233 Store in a well-ventilated place. Keep container tightly closed.

MESITYL OXIDE price More Price(18)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 49722 4-Methyl-3-penten-2-one analytical reference material 141-79-7 1ml $60.7 2017-11-08 Buy
Sigma-Aldrich 281832 Mesityl oxide technical grade, 90% 141-79-7 100g $41.3 2017-11-08 Buy
TCI Chemical M0069 4-Methyl-3-penten-2-one >95.0%(GC) 141-79-7 25mL $26 2017-11-08 Buy
TCI Chemical M0069 4-Methyl-3-penten-2-one >95.0%(GC) 141-79-7 500mL $186 2017-11-08 Buy
Alfa Aesar A15111 Mesityl oxide, 90+%, remainder 4-methyl-4-penten-2-one 141-79-7 100ml $37.4 2017-11-08 Buy

MESITYL OXIDE Chemical Properties,Uses,Production


Mesity oxide is a tri-functional intermediate of considerable utility in the synthesis of a number of different types of organic compounds, such as mesityl oxide can be hydrogenated to methyl isobutyl ketone and other flavor ingredients in foods, such as 4- methyl-pentanone. Mesityl oxide can be used as a solvent for resins, gums, nitrocellulose, oils, lacquers, and inks. It is also used as an insect repellant and used in ore flotation.


[1] Pradyot Patnaik, A Comprehensive Guide to the Hazardous Properties of Chemical Substances, 3rd Edition, 2007
[2] Klaus Weissermel, and Hans-Jürgen Arpe, Industrial Organic Chemistry, 3rd Edition, 1997
[3] George A. Burdock, Fenaroli’s Handbook of Flavor Ingredients, 4th Edition, 2001

Chemical Properties


General Description

A colorless, oily liquid with a pungent honey-like odor. Flash point 87°F. Less dense than water and slightly soluble in water. Vapors heavier than air. Used in paint removers, as a solvent for plastics, and as an insect repellent.

Air & Water Reactions

Highly flammable. Slightly soluble in water

Reactivity Profile

Mixing MESITYL OXIDE in equal molar proportions with any of the following substances in a closed container caused the temperature and pressure to increase: 2-aminoethanol, chlorosulfonic acid, ethylene diamine, nitric acid, oleum, or sulfuric acid [NFPA 1991].

Health Hazard

Inhalation causes irritation of nose and throat, headache, dizziness, difficult breathing. Contact with liquid or concentrated vapor causes severe eye irritation. Liquid irritates skin. Ingestion causes irritation of mouth and stomach.

Fire Hazard

Behavior in Fire: Vapor is heavier than air and may travel a considerable distance to a source of ignition and flash back.

MESITYL OXIDE Preparation Products And Raw materials

Raw materials

Preparation Products


Global( 137)Suppliers
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J & K SCIENTIFIC LTD. 400-666-7788 +86-10-82848833
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Meryer (Shanghai) Chemical Technology Co., Ltd. +86-(0)21-61259100(Shanghai) +86-(0)755-86170099(ShenZhen) +86-(0)10-62670440(Beijing)
+86-(0)21-61259102(Shanghai) +86-(0)755-86170066(ShenZhen) +86-(0)10-88580358(Beijing) China 40403 62
Alfa Aesar 400-610-6006; 021-67582000
021-67582001/03/05 China 30314 84
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021-67121385 China 22833 81
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Shanghai Sinch Parmaceuticals Tech. Co. Ltd. +86-21-54098501
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Jia Xing Isenchem Co.,Ltd 0573-85280080,15157346371
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