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306975

tert-Butyl methyl ether

anhydrous, 99.8%

Synonym(s):

MTBE, Methyl tert-butyl ether

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Pack SizeSKUAvailabilityPrice
100 mL

Available to ship onMay 12, 2026fromMILWAUKEE

$81.70
1 L
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$147.00
2 L

Available to ship onMay 12, 2026fromMILWAUKEE

$222.00
6 x 1 L
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$732.00

About This Item

Linear Formula:
(CH3)3COCH3
CAS Number:
1634-04-4
Molecular Weight:
88.15
UNSPSC Code:
12352112
NACRES:
NA.21
PubChem Substance ID:
57648465
EC Number:
216-653-1
Beilstein/REAXYS Number:
1730942
MDL number:
MFCD00008812
Assay:
99.8%
Grade:
anhydrous
Bp:
55-56 °C (lit.)
Vapor pressure:
4.05 psi

$81.70

Available to ship onMay 12, 2026Details

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grade

anhydrous

Quality Level

100

vapor density

3.1 (vs air)

vapor pressure

4.05 psi

assay

99.8%

form

liquid

autoignition temp.

705 °F

expl. lim.

15.1 %

impurities

<0.003% water, <0.005% water (100 mL pkg)

evapn. residue

<0.0005%

refractive index

n20/D 1.369 (lit.)

bp

55-56 °C (lit.)

mp

-110 °C

density

0.74 g/mL at 25 °C (lit.)

SMILES string

COC(C)(C)C

InChI

1S/C5H12O/c1-5(2,3)6-4/h1-4H3

InChI key

BZLVMXJERCGZMT-UHFFFAOYSA-N

General description

tert-Butyl methyl ether is a commonly used organic solvent that can be synthesized by acid catalyzed reaction between methanol and isobutene. It is an effective alternative to lead containing additives for enhancing the octane rating of gasoline.
tert-Butyl methyl ether (MTBE) is a gasoline additive. MTBE undergoes oxidative degradation in the presence of propane-oxidizing bacterial strains.[1] The kinetic studies of heat-assisted persulfate oxidation of MTBE under various parameters suggests that the reaction follows the pseudo-first-order kinetics.[2] MTBE can be synthesized by acid catalyzed reaction between methanol and isobutene. A study suggests that the addition of MTBE increases the number of active sites during polymerization of propene by stopped-flow method.

Application

tert-Butyl methyl ether may be used to synthesize fatty acid methyl esters (FAMEs) and glycerol tert-butyl ether via transesterification with canola oil under supercritical conditions.

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This Item
67540734875320196
tert-Butyl methyl ether anhydrous, 99.8%

Sigma-Aldrich

306975

tert-Butyl methyl ether

tert-Butyl methyl ether HPLC Plus, for HPLC, GC, and residue analysis, 99.9%

Sigma-Aldrich

675407

tert-Butyl methyl ether

tert-Butyl methyl ether suitable for HPLC, &#8805;99.8%

Sigma-Aldrich

34875

tert-Butyl methyl ether

tert-Butyl methyl ether reagent grade, 98%

Sigma-Aldrich

320196

tert-Butyl methyl ether

assay

99.8%

assay

99.9%

assay

≥99.8%

assay

98%

grade

anhydrous

grade

HPLC Plus

grade

HPLC grade

grade

reagent grade

Quality Level

100

Quality Level

100

Quality Level

100

Quality Level

100

form

liquid

form

liquid

form

liquid

form

liquid

bp

55-56 °C (lit.)

bp

55-56 °C (lit.)

bp

55-56 °C (lit.)

bp

55-56 °C (lit.)

autoignition temp.

705 °F

autoignition temp.

705 °F

autoignition temp.

705 °F

autoignition temp.

705 °F

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pictograms

FlameExclamation mark
GHS02,GHS07

signalword

Danger

hcodes

H225,H315

Hazard Classifications

Flam. Liq. 2 - Skin Irrit. 2

Storage Class

3 - Flammable liquids

flash_point_f

-18.4 °F - closed cup

flash_point_c

-28 °C - closed cup

ppe

Eyeshields, Faceshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
SHBT5055
SHBT2896
SHBT0200
SHBS8939
SHBS4423

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<BIG>Eagleson M. </BIG>
Concise Encyclopedia Chemistry, 154-154 (1995)
Application of artificial neural networks for modeling of the treatment of wastewater contaminated with methyl tert-butyl ether (MTBE) by UV/H 2 O 2 process.
Salari D, et al.
Journal of Hazardous Materials, 125(1), 205-210 (2005)
Viktor Nilsson et al.
Chemphyschem : a European journal of chemical physics and physical chemistry, 21(11), 1166-1176 (2020-04-21)
To elucidate what properties control and practically limit ion transport in highly concentrated electrolytes (HCEs), the viscosity, ionic conductivity, ionicity, and transport numbers were studied for nine model electrolytes and connected to the rate capability in Li-ion battery (LIB) cells.
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Global Trade Item Number

SKUGTIN
306975-PB-1250L-P104065267171531
306975-20L-P204061838151988
306975-PI-200L-P204065270021854
306975-100ML04061837533068
306975-6X1L04061826673218
306975-2L04061826673201
306975-1L04061837533075

Questions

1–3 of 3 Questions  

  1. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/418/501/product-dating-information-06-25-mk.pdf

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  2. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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  3. How is the dehydration process for this product? Is it through molecular sieves or by using sodium?

    1 answer

    1. Molecular sieves are employed to dehydrate the product.

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