1,2,4-Trimethylbenzene

Description Top

CAS number	95-63-6
Chemical formula	C₉H₁₂
Standard European Behaviour Classification (SEBC)	Floater that evaporates (FE)

GESAMP Hazard profile

A1	A2	B1	B2	C1	C2	C3	D1	D2	D3	E1	E2	E3
3	NR	4	0	0	0	1	2	1		NI	FE	2

Marine pollution Classification (MARPOL Annex II)

Category	Description
X	Noxious Liquid Substances which, if discharged into the sea from tank cleaning or deballasting operations, are deemed to present a major hazard to either marine resources or human health and, therefore, justify the prohibition of the discharge into the marine environment.

Alternate names for this chemical

Pseudocumene
Trimethyl-1,2,4 Benzene
Trimethylbenzene
1,2,4-Trimethylbenzene
1,2,4-Trimethyl Benzene

Physico-chemical properties Top

Chemical formula

C₉H₁₂

Molar mass

120.19 [g/mol]

State

Liquid at 25°C and 1 atm

Fusion temperature

-60.5 [°C]

Boiling temperature

169.5 [°C]

Critical temperature

649.1 [°C]

Density

880 [Kg/m³] at a temperature of 20°C

Surface tension

29.2 [mN/m] at a temperature of 25°C

Kinematic viscosity

0.843 [cSt] at a temperature of 20°C

Hydrosolubility

60 [mg/l] at a temperature of 20°C and salinity of 0‰

42 [mg/l] at a temperature of 25°C and salinity of 0‰

40 [mg/l] at a temperature of 25°C and salinity of 34.5‰

Vapour pressure

133.32 [Pa] at a temperature of 20°C

256 [Pa] at a temperature of 25°C

Critical pressure

3232000 [Pa]

Vapour density

3.4

Flash point (Pensky-Martens closed cup)

44 [°C]

Lower explosivity limit (LEL)

0.9 [%]

Upper explosivity limit (UEL)

6.4 [%]

Vaporization enthalpy

398785 [J/Kg] at a temperature of 25°C

Combustion enthalpy

41000000 [J/Kg]

Specific heat capacity

1789 [J/(Kg·K)]

Combustion efficiency

70 [%]

Mass flow rate of the combustion surface

0.06 [Kg/(m²·s)]

Radiative fraction

30 [%]

Henry's constant

624.162 [mol/(m³·Pa)]

Behaviour Top

Log Kow	3.78
Log Koc	3.33
Hydrolysis (Half-life)	Not hydrolysable
Aqueous photolysis (Half-life)	Not photolysable
Biodegradation in estuary environment (Half-life)	10 days
Biodegradation in marine environment (Half-life)	10 days
Standard European Behaviour Classification (SEBC)	Floater that evaporates (FE)
Bioconcentration factor (BCF)	152

Ecotoxicity Top

Lowest median lethal concentration (LC₅₀) on crustacean

4.35 [mg/l]

Lowest median lethal concentration (LC₅₀) on fishes

7.72 [mg/l]

Assessment factor (AF)

1 on the short-term

Predicted No Effect Concentration (PNEC)

120 [µg/l] on the short-term

Hazards Top

Warning

Hazards statements

Physical

H226

Flammable liquid and vapour.

Health

H315

Causes skin irritation.

H319

Causes serious eye irritation.

H332

Harmful if inhaled.

H335

May cause respiratory irritation.

Environmental

H411

Toxic to aquatic life with long lasting effects.

Precautionary statements

Prevention

P210

Keep away from heat/sparks/open flames/hot surfaces. No smoking.

P243

Take precautionary measures against static discharge.

P261

Avoid breathing dust/fume/gas/mist/vapours/spray.

P280

Wear protective gloves/protective clothing/eye protection/face protection.

Response

P301 + P310

IF SWALLOWED: Immediately call a POISON CENTER or doctor/physician.

P302 + P352

IF ON SKIN: Wash with plenty of soap and water.

GESAMP Top

More information on GESAMP Hazard Evaluation Procedure

GESAMP Hazard profile

A1	A2	B1	B2	C1	C2	C3	D1	D2	D3	E1	E2	E3
3	NR	4	0	0	0	1	2	1		NI	FE	2

A1: Bioaccumulation

Rating	Description
3	Moderate potential to bioaccumulate

A1a:

Rating	Description	Criteria [mg/l]
3	Moderate potential to bioaccumulate	3 ≤ Log Kow < 4

A1b:

Rating	Description	Criteria
3	Moderate potential to bioaccumulate	100 ≤ BCF < 500

A2: Biodegradation

Rating	Description
NR	Not readily biodegradable

B1: Acute aquatic toxicity

Rating	Description	Criteria [mg/l]
4	Highly toxic	0.1 < LC/EC/IC₅₀ ≤ 1

B2: Chronic aquatic toxicity

Rating	Description	Criteria [mg/l]
0	Negligible	NOEC > 1

C1: Acute oral toxicity

Rating	Description	Criteria [mg/Kg]
0	Negligible	AOTE > 2000

C2: Acute dermal toxicity (skin contact)

Rating	Description	Criteria [mg/Kg]
0	Negligible	ADTE > 2000

C3: Acute inhalation toxicity

Rating	Description	Criteria [mg/l] (4 hours exposure)
1	Slight	10 < AITE ≤ 20

D1: Skin irritation or corrosion

Rating	Description	Sign	GHS category
2	Irritating	Marked erythema, Obvio	Irritant Category 2

D2: Eye irritation

Rating	Description	Sign	GHS category
1	Mildly irritating	Mild conjunctival hype	Irritant Category 2B

D3: Long-term health effects

Notation	Hazard endpoint	Description	GHS category
		No Information

E1: Tainting of seafood

Rating	Description
NI	No Information

E2: Behaviour of chemicals in the marine environment

Rating	Description
FE	Floater that evaporates

E3: Interference with the use of coastal amenities

Rating	Interference	Description	Interpretation	Warning
2	Moderately objectionable	1 is a persistent floater; and/or 2 is moderately acutely toxic; and/or 3 is irritating to skin and/or eyes; and/or 4 has long-term health effects other than carcinogenicity, mutagenicity or reprotoxicity; and/or 5 is highly flammable; and/or 6 is moderately flammable and is a floater with evaporative properties	1 E2 = Fp; and/or 2 C1 and/or C2 and/or C3 = 23; and/or 3 D1 and/or D2 = 2; and/or 4 D3 contains Ss, Sr, T, A, N, or I; and/or 5 Flashpoint <23°C; and/or 6 Flashpoint 23°C to 60°C and E2 = FE or FED	Warning issued and possible closure of amenities

GHS Security Information

Warning

Improving Member States preparedness to face an HNS pollution of the Marine System (HNS-MS)

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1,2,4-Trimethylbenzene

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