METHYL tertiary-BUTYL ETHER

UN Number: 2398 - CAS Number: 1634-04-4

Also known as: 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
Information on chemical

Information on chemical

External resources

CAMEO Chemical Database
WISER Substance List

Description

UN number 2398
CAS number 1634-04-4
Formula C5H12O

Physical chemical data

Physical State (20°C) Liquid
Physical State (25°C) Liquid
Density (kg/m3)
740.5 [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
Kinematic viscosity (cSt)
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
Molar mass (g/mol) 88.15
Density of gas (kg/m3) 3.87
Solubility (g/L)
48000 [g/L] at a temperature of 20°C and salinity of 0‰
31780 [g/L] at a temperature of 20°C and salinity of 0‰
26870 [g/L] at a temperature of 20°C and salinity of 5‰
20550 [g/L] at a temperature of 20°C and salinity of 30‰
Boiling Point (°C) 55.2
Melting Point (°C) -109
Critical temperature (°C) 467.1
Critical pressure (Pa) 3430000
Surface tension (mN/m)
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
Vapour Pressure (Pa)
310 [Pa] at a temperature of 20°C
33000 [Pa] at a temperature of 25°C
Flash Point (°C) -26
Flash Point (Pensky-Martens closed cup) (°C) -28.2
Lower explosivity limit (LEL) (volume %) 1.26
Upper explosivity limit (UEL) (volume %) 8.4
Vapor enthalpy (J/Kg)
316960 [J/Kg] at a temperature of 55.25°C
338287 [J/Kg] at a temperature of 25°C
Combus enthalpy (J/Kg) 35300000
Specific heat capacity (J/(Kg·K)) 2127
Combustion efficiency (%) 96
Mass flow rate of the combustion surface (Kg/(m²·s)) 0.04
Rad fraction (%) 23
Henry's constant (mol/(m³·Pa)) 43.8

Behaviour at sea

Log kow 1.06
Log koc 1.05
Aqueous photolysis (Half-life) Not photolysable
Biodegradation in estuary environment (Half-life) (days) Not hydrolysable
Biodegradation in marine environment (Half-life) (days) Not biodegradable
Bioconcentration factor (BCF) 1.5

Additional data

MARPOL pollution category
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.
Standard behavior classification FED

Transportation data

Package group II
Cargo group 41
State liquid
IMO class 3.1

Reactivity data

Acid(s) Yes
Base(s) Yes
Oxidizing agents Yes

GESAMP Hazard profile

Bioaccumulation in logPow (A1A) 1 - ≥1 and <2
Bioaccumulation (A1) 1 - Very low potential to bioaccumulate
Biodegradation (A2) NR - Not readily biodegradable
Acute aquatic toxicity (B1) (LC/EC/IC50 (mg/l)) 1 - Practically non-toxic
Acute mammalian toxicity by swallowing (C1) (LD50 (mg/kg)) 0 - Negligible
Acute mammalian toxicity by skin penetration (C2) (LD50 (mg/kg)) 0 - Negligible
Acute mammalian toxicity by inhalation (C3) (LC50 (mg/l)) 0 - Negligible
Skin irritation/corrosivity (D1) 1 - Mildly irritating
Eye irritation/corrosivity (D2) 1 - Mildly irritating
Interference with coastal amenities (E2) E - Evaporator
Effects on wildlife and bottom habitats (E3) 2 - Is a persistent floater; and/or is moderately acutely toxic; and/or is irritating to skin and/or eyes; and/or has long-term health effects other than carcinogenicity, mutagenicity or reprotoxicity; and/or is highly flammable; and/or is flammable and is a floater with evaporative properties

Human toxicity threshold

Flammable Harmful
Hazard 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.
TLV-TWA 40
TEEL-1 (mg/m3) 50 ppm
TEEL-2 (mg/m3) 570 ppm
TEEL-3 (mg/m3) 5300 ppm

Ecotoxicity

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

Incident reports

No incident reports available

Emergency Response Guidebook

Emergency Response Guidebook

Guide number: 127

See the guide or download the emergency response guidebook

At sea emergency guide

At sea emergency guide

Emergency schedule: 3-07

• 1 CLASS 3.1
FLAMMABLE LIQUIDS, FLASHPOINT BELOW -18°C Closed Cup; NOT COVERED BY OTHER SCHEDULES; IMMISCIBLE WITH WATER.
• 2 CLASS 3.2
FLAMMABLE LIQUIDS, FLASHPOINT BETWEEN -18°C AND 23°C Closed Cup; NOT COVERED BY OTHER SCHEDULES; IMMISCIBLE WITH WATER.
• 3 CLASS 3.3
FLAMMABLE LIQUIDS, FLASHPOINT BETWEEN 23°C AND 61°C Closed Cup; NOT COVERED BY OTHER SCHEDULES; IMMISCIBLE WITH WATER.

Emergency procedures

Action

Avoid all sources of ignition (e.g. naked lights, unprotected light bulbs, electric handtools).

Spillage on deck

Wash spillage overboard with copious quantities of water.

Spillage under deck

Provide adequate ventilation. Collect spillage, where practicable, using absorbent material, for safe disposal.

Fire on deck

Use water spray, foam or dry chemical. Do NOT use water jet. If possible remove receptacles likely to be involved or keep them cool with copious quantities of water.

Fire under deck

Batten down; use ship's fixed fire-fighting installation. Otherwise adopt action as for "On deck".

Special equipment to be carried

Protective gloves and boots.
Self-contained breathing apparatus.
Spray nozzles.

Remarks by UN no.

• 2-ETHYLBUTYL ACETATE (UN No. 1177)
Self-contained breathing apparatus not necessary - use goggles for eye protection.

• ISOPROPYL NITRATE (UN No. 1222)
In fire, explosion hazard.

• PINE OIL (UN No. 1272)
Self-contained breathing apparatus not necessary - use goggles for eye protection.

• ZIRCONIUM SUSPENDED IN A FLAMMABLE LIQUID (UN No. 1308)
Spillage is liable to self-ignition. Use water spray from as many hoses as possible from as far away as practicable.

• normal-PROPYL NITRATE (UN No. 1865)
In fire, explosion hazard.

• CYCLOPENTANOL (UN No. 2244)
• normal-UNDECANE (UN No. 2330)
Self-contained breathing apparatus not necessary - use goggles for eye protection.

• 3-BROMOPROPYNE (UN No. 2345)
In fire, explosion hazard. Fight fire from a protected position.

• TETRAMETHYLSILANE (UN No. 2749)
Possible self-ignition at ambient temperatures.

• ELEVATED TEMPERATURE LIQUID, FLAMMABLE, N.O.S. (UN No. 3256), with
flashpoint above 61°C c.c., at or above its flashpoint .
Spilled liquid may be very hot and remain above its flashpoint for some time after spillage.

Decision trees

Decision trees

No decision trees available

No additional data

last modified 2020-12-14T09:02:42+00:00