4-Methyl-3-penten-2-one
CAS No.: 141-79-7
Synonyms:
Formula: C6H10O
Exact Mass: 98.07320
Molecular Weight: 98.14300
PSA: 17.07000
LogP: 1.54160
4-Methyl-3-penten-2-one 141-79-7 MSDS
Name: Mesityl oxide 99% mixt.of alpha- and bet a isomers(ca.93% alpha) Material Safety Data Sheet
Synonym: 4-Methyl-3-penten-2-one; Isobutenyl methyl ketone; Isopropylidene-aceton
CAS: 141-79-7
Section 1 - Chemical Product   MSDS Name:Mesityl oxide 99% mixt.of alpha- and bet a isomers(ca.93% alpha) Material Safety Data Sheet
Synonym:4-Methyl-3-penten-2-one; Isobutenyl methyl ketone; Isopropylidene-aceton

Section 2 - COMPOSITION, INFORMATION ON INGREDIENTS
CAS# Chemical Name content EINECS#
141-79-7 Mesityl oxide 99 205-502-5
Hazard Symbols: XN
Risk Phrases: 10 20/21/22

Section 3 - HAZARDS IDENTIFICATION
  EMERGENCY OVERVIEW
Flammable. Harmful by inhalation, in contact with skin and if swallowed.Lachrymator (substance which increases the flow of tears).
Potential Health Effects
Eye:
Causes severe eye irritation. Vapors may cause eye irritation.
May cause corneal opacity in addition to corneal scarring and necrosis. May cause chemical conjunctivitis and corneal damage.
Skin:
May cause severe skin irritation. Prolonged and/or repeated contact may cause irritation and/or dermatitis. Substance is rapidly absorbed through the skin. May cause irritation and dermatitis. May cause cyanosis of the extremities.
Ingestion:
May cause irritation of the digestive tract. May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May cause liver and kidney damage. May cause central nervous system depression, characterized by excitement, followed by headache, dizziness, drowsiness, and nausea. Advanced stages may cause collapse, unconsciousness, coma and possible death due to respiratory failure. May be harmful if swallowed. Ingestion of large amounts may cause CNS depression.
Inhalation:
Causes respiratory tract irritation. May cause liver and kidney damage. May cause lung damage. Causes narcotic effects including headache, dizziness, weakness, unconsciousness, and possible death.
Aspiration may lead to pulmonary edema. Vapors may cause dizziness or suffocation. May cause burning sensation in the chest.
Chronic:
Prolonged or repeated inhalation may cause lung damage and/or central nervous system disturbances. Prolonged or repeated skin contact may cause dermatitis. May cause liver and kidney damage.

Section 4 - FIRST AID MEASURES
  Eyes: Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.
Skin:
Get medical aid immediately. Immediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes.
Ingestion:
If victim is conscious and alert, give 2-4 cupfuls of milk or water.
Never give anything by mouth to an unconscious person. Get medical aid immediately.
Inhalation:
Get medical aid immediately. Remove from exposure and move to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen.
Notes to Physician:

Section 5 - FIRE FIGHTING MEASURES
  General Information:
As in any fire, wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Vapors can travel to a source of ignition and flash back. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Will burn if involved in a fire. Use water spray to keep fire-exposed containers cool. Water may be ineffective. Material is lighter than water and a fire may be spread by the use of water. Containers may explode in the heat of a fire. Flammable liquid and vapor. Vapors may be heavier than air. They can spread along the ground and collect in low or confined areas. Vapors may form an explosive mixture with air.
Extinguishing Media:
For small fires, use water spray, dry chemical, carbon dioxide or chemical foam. Use water spray to cool fire-exposed containers.
Water may be ineffective. For large fires, use water spray, fog or alcohol-resistant foam. Do NOT use straight streams of water. Cool containers with flooding quantities of water until well after fire is out.

Section 6 - ACCIDENTAL RELEASE MEASURES
  General Information: Use proper personal protective equipment as indicated in Section 8.
Spills/Leaks:
Absorb spill with inert material (e.g. vermiculite, sand or earth), then place in suitable container. Remove all sources of ignition.
Use a spark-proof tool. Isolate area and deny entry. Provide ventilation. A vapor suppressing foam may be used to reduce vapors.

Section 7 - HANDLING and STORAGE
  Handling:
Wash thoroughly after handling. Use only in a well-ventilated area.
Ground and bond containers when transferring material. Use spark-proof tools and explosion proof equipment. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Keep away from heat, sparks and flame. Avoid ingestion and inhalation. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Storage:
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a tightly closed container. Keep from contact with oxidizing materials. Store in a cool, dry, well-ventilated area away from incompatible substances. Flammables-area.

Section 8 - EXPOSURE CONTROLS, PERSONAL PROTECTION
  Engineering Controls:
Use adequate general or local exhaust ventilation to keep airborne concentrations below the permissible exposure limits.
Exposure Limits CAS# 141-79-7: United States OSHA: 25 ppm TWA; 100 mg/m3 TWA Belgium - TWA: 15 ppm VLE; 61 mg/m3 VLE Belgium - STEL: 25 ppm VLE; 101 mg/m3 VLE France - VME: 15 ppm VME; 60 mg/m3 VME Germany: 25 ppm TWA; 100 mg/m3 TWA Germany: Skin absorber Malaysia: 15 ppm TWA; 60 mg/m3 TWA Netherlands: 15 ppm MAC; 60 mg/m3 MAC Russia: 1 mg/m3 TWA Spain: 15 ppm VLA-ED; 61 mg/m3 VLA-ED Spain: 25 ppm VLA-EC; 102 mg/m3 VLA-EC Personal Protective Equipment Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166.
Skin:
Wear appropriate protective gloves to prevent skin exposure.
Clothing:
Wear appropriate protective clothing to prevent skin exposure.
Respirators:
Follow the OSHA respirator regulations found in 29 CFR 1910.134 or European Standard EN 149. Use a NIOSH/MSHA or European Standard EN 149 approved respirator if exposure limits are exceeded or if irritation or other symptoms are experienced.

Section 9 - PHYSICAL AND CHEMICAL PROPERTIES
 
Physical State: Liquid
Color: oily, colorless to light yellow
Odor: peppermint or honey-like
pH: Not available.
Vapor Pressure: 10 mm Hg @ 26C
Viscosity: Not available.
Boiling Point: 130 deg C
Freezing/Melting Point: -59 deg C
Autoignition Temperature: 652 deg F ( 344.44 deg C)
Flash Point: 87 deg F ( 30.56 deg C)
Explosion Limits, lower: 1.4%
Explosion Limits, upper: 7.2%
Decomposition Temperature:
Solubility in water: Slightly soluble in water.
Specific Gravity/Density: 0.8539
Molecular Formula: C6H10O
Molecular Weight: 98.0694

Section 10 - STABILITY AND REACTIVITY
  Chemical Stability:
Stable under normal temperatures and pressures.
Conditions to Avoid:
Incompatible materials, ignition sources, excess heat.
Incompatibilities with Other Materials:
2-aminoethanol, strong oxidizing agents, chlorosulfonic acid, ethylene diamine, nitric acid, oleum, sulfuric acid.
Hazardous Decomposition Products:
Carbon monoxide, irritating and toxic fumes and gases, carbon dioxide.
Hazardous Polymerization: Has not been reported.

Section 11 - TOXICOLOGICAL INFORMATION
  RTECS#:
CAS# 141-79-7: SB4200000 LD50/LC50:
CAS# 141-79-7: Draize test, rabbit, eye: 20 mg Severe; Inhalation, mouse: LC50 = 10 gm/m3/2H; Inhalation, rat: LC50 = 9 gm/m3/4H; Oral, mouse: LD50 = 710 mg/kg; Oral, rabbit: LD50 = 1 gm/kg; Oral, rat: LD50 = 1120 mg/kg; Skin, rabbit: LD50 = 5150 mg/kg.
TCLo (Inhalation, Human) = 25 ppm ppm/8H; Kidney, Ureter, Bladder - other changes; Related to Chronic Data - Carcinogenicity:
Mesityl oxide - Not listed by ACGIH, IARC, or NTP.
Other:
See actual entry in RTECS for complete information.

Section 12 - ECOLOGICAL INFORMATION
  Ecotoxicity:
Fish: Goldfish: LC50 = 540 mg/L; 24 Hr.; Modified ASTM D1345

Section 13 - DISPOSAL CONSIDERATIONS
  Dispose of in a manner consistent with federal, state, and local regulations.

Section 14 - TRANSPORT INFORMATION
 
IATA
Shipping Name: MESITYL OXIDE
Hazard Class: 3
UN Number: 1229
Packing Group: III
IMO
Shipping Name: MESITYL OXIDE
Hazard Class: 3.3
UN Number: 1229
Packing Group: III
RID/ADR
Shipping Name: MESITYL OXIDE
Hazard Class: 3
UN Number: 1229
Packing group: III

Section 15 - REGULATORY INFORMATION
 
European/International Regulations
European Labeling in Accordance with EC Directives
Hazard Symbols: XN
Risk Phrases:
R 10 Flammable.
R 20/21/22 Harmful by inhalation, in contact with
skin and if swallowed.
Safety Phrases:
S 9 Keep container in a well-ventilated place.
S 16 Keep away from sources of ignition - No
smoking.
S 25 Avoid contact with eyes.
S 33 Take precautionary measures against static
discharges.
WGK (Water Danger/Protection)
CAS# 141-79-7: 1
Canada
CAS# 141-79-7 is listed on Canada's DSL List.
CAS# 141-79-7 is listed on Canada's Ingredient Disclosure List.
US FEDERAL
TSCA
CAS# 141-79-7 is listed on the TSCA inventory.


SECTION 16 - ADDITIONAL INFORMATION
N/A

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