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Synonym: Ethyl methyl ketone, MEK, Methyl ethyl ketone
CAS Number: 78-93-3
Linear Formula: C2H5COCH3
Molecular Weight: 72.11
FEMA Number: 2170
Beilstein Registry Number: 741880
EC Number: 201-159-0
Council of Europe no.: 753
MDL number: MFCD00011648
PubChem Substance ID: 24900680![]()
Flavis number: 7.053
| Related Categories | A-B, Alphabetical Listings, Flavors and Fragrances |
| grade | FCC |
| FG | |
| Halal | |
| Kosher | |
| NI | |
| vapor density | 2.49 (vs air) |
| vapor pressure | 71 mmHg ( 20 °C) |
| assay | ≥99.5% |
| autoignition temp. | 960 °F |
| expl. lim. | 10.1 % |
| refractive index | n |
| bp | 80 °C(lit.) |
| mp | −87 °C(lit.) |
| density | 0.805 g/mL at 25 °C(lit.) |
| Organoleptic | ethereal |
| allergen | no known allergens |
1 kg in alum btl
8, 20 kg in comp drum
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| FT-IR Raman | ![]() |
| FT-NMR | ![]() |
| Structure Search |
| Pressure-Temperature Nomograph |
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| Allergen Statement |
| Food Grade Statement |
| GMO Statement |
| Symbol | ![]() GHS02, GHS07 |
| Signal word | Danger |
| Hazard statements | H225-H319-H336 |
| Precautionary statements | P210-P261-P305 + P351 + P338 |
| Supplemental Hazard Statements | Repeated exposure may cause skin dryness or cracking. |
| Personal Protective Equipment | Eyeshields, Faceshields, full-face respirator (US), Gloves, multi-purpose combination respirator cartridge (US), type ABEK (EN14387) respirator filter |
| Hazard Codes | F,Xi |
| Risk Statements | 11-36-66-67 |
| Safety Statements | 9-16 |
| RIDADR | UN 1193 3/PG 2 |
| WGK Germany | 1 |
| RTECS | EL6475000 |
| Flash Point(F) | 26.6 °F |
| Flash Point(C) | -3 °C |
Merck 14,6072
Beil. 1,IV,3243
Fieser 1,678
Aldrich MSDS 1, 305:B / Arctander, 2020 / Corp MSDS 1 (1), 606:C / FT-IR 1 (1), 405:B / FT-IR 2 (1), 640:C / FT-NMR 1 (1), 631:C / Fenaroli, 183 / IR-Spectra (2), 214:B / IR-Spectra (3), 240:B / NMR-Reference 2 (1), 369:B / RegBook 1 (1), 447:D / RegBook 20 (1), 447:D / Sax 6, 549 / Sigma FT-IR 1 (2), 730:D / Structure Index 1, 64:D:1 / Vapor Phase 3, 487:B
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