Home Categories Organic Chemistry 1,2,4-Trimethylbenzene
A7729412

1,2,4-Trimethylbenzene , 98% , 95-63-6

Synonym(s):
1,2,4-Trimethylbenzene;Pseudocumene;Pseudocumol

CAS NO.:95-63-6

Empirical Formula: C9H12

Molecular Weight: 120.19

MDL number: MFCD00008527

EINECS: 202-436-9

Update time: 2022-07-08

PRODUCT Properties

Melting point: -44 °C
Boiling point: 168 °C(lit.)
Density  0.876 g/mL at 20 °C(lit.)
vapor density  4.1 (vs air)
vapor pressure  4.5 mm Hg ( 37.7 °C)
refractive index  n20/D 1.504(lit.)
Flash point: 120 °F
storage temp.  Store below +30°C.
solubility  0.057g/l
form  Liquid
pka >14 (Schwarzenbach et al., 1993)
color  Clear colorless
Odor char. aromatic odor
explosive limit 0.8-7%(V)
Odor Threshold 0.12ppm
Water Solubility  Soluble in alcohol, benzene and ether. Slightly soluble in water
Merck  14,7915
BRN  1903005
Henry's Law Constant 6.946, 11.202, and 15.702 at 27.0, 35.0, and 45.0 °C, respectively (dynamic headspace, Hansen et al., 1995)
Exposure limits NIOSH REL: TWA 25 ppm (125 mg/m3); ACGIH TLV: TWA for mixed isomers 25 ppm (adopted).
Dielectric constant 2.4(16℃)
Stability: Stable. Incompatible with strong oxidizing agents. Flammable. May form explosive mixtures with air.
InChIKey GWHJZXXIDMPWGX-UHFFFAOYSA-N
LogP 3.630

Description and Uses

1,2,4-Trimethylbenzene (mesitylene) is an aromatic hydrocarbon compound commonly present in commercial solvents encompassing their boiling range. Mesitylene are the most common isomer used in commercial applications. Aromatic hydrocarbons in hydrocarbon solvents are predominantly alkylated one ring structures as well as two aromatic ring structures which may also be alkylated.

1,2,4-Trimethylbenzene is the unlabelled version of 1,2,4-Trimethyl 13C6-benzene (T796173), a labelled aromatic standard.

Safety

Symbol(GHS) 
GHS02,GHS07,GHS08,GHS09
Signal word  Danger
Hazard statements  H226-H304-H315-H319-H332-H335-H411
Precautionary statements  P210-P273-P301+P310+P331-P302+P352-P304+P340+P312-P305+P351+P338
Hazard Codes  Xn,N,F,Xi,T
Risk Statements  10-20-36/37/38-51/53-39/23/24/25-23/24/25-11-65
Safety Statements  26-61-45-36/37-16-7-62
RIDADR  UN 3295 3/PG 3
OEB A
OEL TWA: 25 ppm (125 mg/m3)
WGK Germany  2
RTECS  DC3325000
Autoignition Temperature 959 °F
Hazard Note  Irritant/Flammable
TSCA  Yes
HazardClass  3
PackingGroup  III
HS Code  29029090
Toxicity LD50 i.p. in male, female mice (mg/kg): 5000, 4100 (Janik-Spiechowicz)

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