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CAS 78-93-3

CAS 78-93-3 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 78-93-3
CAS 78-93-3PubChem CID 6569

Methyl Ethyl Ketone

2-Butanone is a manufactured chemical but it is also present in the environment from natural sources. It is a colorless liquid with a sharp, sweet odor. It is also known as methyl ethyl ketone (MEK). 2-Butanone is produced in large quantities. Nearly half of its use is in paints and other coatings because it will quickly evaporate into the air and it dissolves many substances. It is also used in glues and as a cleaning agent. 2-Butanone occurs as a natural product. It is made by some trees and found in some fruits and vegetables in small amounts. It is also released to the air from car and truck exhausts. — Agency for Toxic Substances and Disease Registry (ATSDR)

IUPAC name
butan-2-one
Molecular formula
C4H8O
Molecular weight
72.11 g/mol
Exact mass
72.057514874 Da
XLogP3
0.3
Topological polar surface area
17.1 Ų
Hydrogen-bond donors
0
Hydrogen-bond acceptors
1
Covalent units
1
Defined stereocentres
0

Also known as

2-ButanoneButanoneEthyl methyl ketoneMethylethyl ketoneMeetcoMethyl acetoneMethylethylketone3-Butanone
16 more reported names
EthylmethylketonAethylmethylketonButanone 2Acetone, methyl-Ethyl methyl cetoneMetiletilchetoneMetyloetyloketonKetone, ethyl methylMetyl ethyl ketoneMetiletilcetonaRCRA waste number U159EthylmethylcetoneFEMA No. 21706PT9KLV9IOAI3-07540 (USDA)EPA Pesticide Chemical Code 044103
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External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 78-93-3

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How CAS 78-93-3 is used on this site

CAS 78-93-3 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 78-93-3 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.