Improving Member States preparedness to face an HNS pollution of the Marine System (HNS-MS)
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
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 |
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| Surface tension |
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| Kinematic viscosity |
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| Hydrosolubility |
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| Vapour pressure |
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| 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 |
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| 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) |
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| Predicted No Effect Concentration (PNEC) |
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Hazards Top
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
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.
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Copyright © 2015–2024 HNS-MS Consortium
HNS-MS has been funded by DG-ECHO under agreement ECHO/SUB/2014/693705 and runs from 1 January 2015 to 31 March 2017.