NAME: Mesityl Oxide

SYNONYM(s): 4-Methyl-3-penten-2-one; Isobutenyl methyl ketone; Methyl isobutenyl ketone; Isopropylidene acetone

IMIS: 1635

CAS: 141-79-7

NIOSH: RTECS SB4200000; 54967

DOT: UN1229 Flammable Liquid

DESCRIPTION:

Clear, pale yellow, or colorless liquid with a strong peppermint odor.
MW: 98
BP: 266 F
VP: 8 mm
MP: -51 F

INCOM: Oxidizers

OSHA GENERAL INDUSTRY PEL: 25 ppm, 100 mg/m3

OSHA CONSTRUCTION INDUSTRY PEL: 25 ppm, 100 mg/m3 TWA

ACGIH TLV: 15 ppm, 60 mg/m3 TWA; 25 ppm, 100 mg/m3 STEL

NIOSH REL: 10 ppm TWA

SYMPTOM(s): Eye, skin, mucous membrane irritation; narcosis, coma; In animals: CNS effects

HEALTH EFFECTS: Irritation-Eye, Nose, Throat, Skin---Mild (HE16)

ORGAN: Eyes, skin, respiratory system, CNS

PRIMARY SAMPLING/ANALYTICAL METHOD (SLC1):

MEDIA: Charcoal Tube (100/50 mg sections, 20/40 mesh)
ANL SOLVENT: (99:1) Carbon Disulfide/Methanol
ALT SOLVENT: (99:1) Carbon Disulfide/Dimethylformamide
MAX V: 25 Liters   MAX F: 0.2 L/min (TWA)
MAX V: 3 Liters   MAX F: 0.2 L/min (STEL)
ANL 1: Gas Chromatography; GC/FID
REF: 1 (NIOSH 1301)
SAE: 0.12
CLASS: Fully Validated

SECONDARY SAMPLING/ANALYTICAL METHOD (SAM2):

DEVICE: Detector Tube COMPANY: Kitagawa
PART #: 218U RANGE: 5-100 ppm
CLASS: Mfg
DEVICE: Instrumentation COMPANY: Infrared Spectrophotometer
PART #: MIRAN 1A & 1B RANGE: 0.8 ppm @ 8.2 um
CLASS: Mfg