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

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Methyl Tert-Butyl Ether

Description Top

CAS number 1634-04-4
UN number 2398
Chemical formula C5H12O
Standard European Behaviour Classification (SEBC) Evaporator that dissolves (ED)
GESAMP Hazard profile
A1 A2 B1 B2 C1 C2 C3 D1 D2 D3 E1 E2 E3
1 NR 1 0 0 0 0 2 1 T ED 2

Marine pollution Classification (MARPOL Annex II)
Category Description
Z Noxious Liquid Substances which, if discharged into the sea from tank cleaning or deballasting operations, are deemed to present a minor hazard to either marine resources or human health and therefore justify less stringent restrictions on the quality and quantity of the discharge into the marine environment.

Alternate names for this chemical
Tert-Butyl Methyl Ether
2-Methoxy-2-Methyl Propane
Methyl T-Butyl Ether
Methyl-Tert-Butyl Ether
Methyl Tertiary Butyl Ether
Methyl 1,1-Dimethylethyl Ether
2-Methyl-2-Methoxypropane
Mtbe
Methyl Butyl Ether
Methyl Tert-Butyl Ether
Methyl-Tertio-Butyl-Ether


Physico-chemical properties Top

Chemical formula C5H12O
Molar mass 88.15 [g/mol]
State Liquid at 25°C and 1 atm
Fusion temperature -108 [°C]
Boiling temperature 55.25 [°C]
Critical temperature 467.1 [°C]
Density
740 [Kg/m³] at a temperature of 20°C
757.4 [Kg/m³] at a temperature of 5°C
752.7 [Kg/m³] at a temperature of 10°C
753.1 [Kg/m³] at a temperature of 20°C
Surface tension
20 [mN/m] at a temperature of 20°C
18.3 [mN/m] at a temperature of 25°C
20.04 [mN/m] at a temperature of 5°C
25.02 [mN/m] at a temperature of 10.1°C
18.06 [mN/m] at a temperature of 18.5°C
Kinematic viscosity
0.47 [cSt] at a temperature of 20°C
1.756 [cSt] at a temperature of 5°C
1.7537 [cSt] at a temperature of 10°C
1.5137 [cSt] at a temperature of 20°C
Hydrosolubility
48000 [mg/l] at a temperature of 20°C and salinity of 0‰
31780 [mg/l] at a temperature of 20°C and salinity of 0‰
26870 [mg/l] at a temperature of 20°C and salinity of 5‰
20550 [mg/l] at a temperature of 20°C and salinity of 30‰
Vapour pressure
27000 [Pa] at a temperature of 20°C
33000 [Pa] at a temperature of 25°C
Critical pressure 3430000 [Pa]
Vapour density 2.6
Flash point (Pensky-Martens closed cup) -28.2 [°C]
Lower explosivity limit (LEL) 1.26 [%]
Upper explosivity limit (UEL) 8.4 [%]
Vaporization enthalpy
316960 [J/Kg] at a temperature of 55.25°C
338287 [J/Kg] at a temperature of 25°C
Combustion enthalpy 35300000 [J/Kg]
Specific heat capacity 2127 [J/(Kg·K)]
Combustion efficiency 96 [%]
Mass flow rate of the combustion surface 0.04 [Kg/(m²·s)]
Radiative fraction 23 [%]
Henry's constant 43.8 [mol/(m³·Pa)]


Behaviour Top

Log Kow 1.06
Log Koc 1.05
Hydrolysis (Half-life) Not hydrolysable
Aqueous photolysis (Half-life) Not photolysable
Biodegradation in estuary environment (Half-life) Not biodegradable
Biodegradation in marine environment (Half-life) Not biodegradable
Standard European Behaviour Classification (SEBC) Evaporator that dissolves (ED)
Bioconcentration factor (BCF) 1.5


Ecotoxicity Top

Lowest median lethal concentration (LC50) on algae 184 [mg/l]
Lowest median lethal concentration (LC50) on crustacean 136 [mg/l]
Lowest median lethal concentration (LC50) on fishes 574 [mg/l]
Highest no observed effect concentration (NOEC) on algae 103 [mg/l]
Highest no observed effect concentration (NOEC) on crustacean 26 [mg/l]
Highest no observed effect concentration (NOEC) on fishes 293.5 [mg/l]
Assessment factor (AF)
100 on the short-term
100 on the long-term
Predicted No Effect Concentration (PNEC)
1360 [µg/l] on the short-term
260 [µg/l] on the long-term


Hazards Top

Flammable
Harmful

Danger

Hazards statements
Physical
H225
Highly flammable liquid and vapour.
Health
H315
Causes skin irritation.

Precautionary statements
Prevention
P210
Keep away from heat/sparks/open flames/hot surfaces. No smoking.
P243
Take precautionary measures against static discharge.
P280
Wear protective gloves/protective clothing/eye protection/face protection.
Response
P302 + P352
IF ON SKIN: Wash with plenty of soap and water.
Storage
P403 + P235
Store in a well-ventilated place. Keep cool.


GESAMP Top

GESAMP Hazard profile
A1 A2 B1 B2 C1 C2 C3 D1 D2 D3 E1 E2 E3
1 NR 1 0 0 0 0 2 1 T ED 2

A1: Bioaccumulation
Rating Description
1 Very low potential to bioaccumulate
A1a:
Rating Description Criteria [mg/l]
1 Very low potential to bioaccumulate 1 ≤ Log Kow < 2
A1b:
Rating Description
NI No Information
A2: Biodegradation
Rating Description
NR Not readily biodegradable
B1: Acute aquatic toxicity
Rating Description Criteria [mg/l]
1 Practically non-toxic 100 < LC/EC/IC50 ≤ 1000
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)
0 Negligible 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
T Substances are considered to cause tainting if a statistically significant off-flavour or smell can be detected following exposure of the fish for 24h to 1mg/l or less.
E2: Behaviour of chemicals in the marine environment
Rating Description
ED Evaporator that dissolves
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

Flammable
Harmful

Danger

  About the project

HNS-MS is a decision-support tool that Belgian and French maritime authorities as well as coastguard stations can activate in order to forecast the drift, fate and behavior of acute marine pollution by Harmful Noxious Substances (HNS) accidentally released in the marine system.

  Contact us

Web: https://www.hns-ms.eu/

Tel : +32 (0)2 773-2102

Mail : hns-ms@naturalsciences.be

Copyright © 2015–2019 HNS-MS Consortium

EU flagHNS-MS has been funded by DG-ECHO under agreement ECHO/SUB/2014/693705 and runs from 1 January 2015 to 31 March 2017.