Antioxidants
REACH
Ethoxyquin
CAS Number
91-53-2
EC Number
202-075-7
E Number
E322a
Abbreviation
EMQ
What is Ethoxyquin?
Ethoxyquin (CAS 91-53-2), also known as E324 and EMQ, is a synthetic antioxidant used to prevent oxidative degradation in animal feed, fish meal, and agricultural commodities.
Where is Ethoxyquin used?
- Aquaculture and livestock feed: applied to fish meal and compound feeds
- Feed and food ingredient supply chains: protects fats, oils, and fat-soluble vitamins from rancidity during storage and transport
- Premix formulations: stabilizer for vitamins A and E
- Spice and paprika processing: prevents color fading and oxidative spoilage in dried botanical ingredients
- Fruit handling: post-harvest treatment against superficial scald on apples and pears during cold storage
- It inhibits lipid oxidation and preserves nutritional value through extended storage cycles.
Commercial specifications
- Purity typically 95% or higher
- Drum and IBC packaging
Other Names (Synonyms)
Ethyl 2,2,4-trimethyl-1,2-dihydro-6-quinolinyl ether|E 324|6-Ethoxy-1,2-dihydro-2,2,4-trimethylquinoline|2,2,4-Trimethyl-6-ethoxy-1,2-dihydroquinoline|1,2-Dihydro-6-ethoxy-2,2,4-trimethylquinoline|1,2-Dihydro-2,2,4-trimethyl-6-ethoxyquinoline|6-Ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline|Santoquin|EMQ|E324
What are the physical properties of Ethoxyquin?
Melting Point ~0 °C (approx)
Boiling Point 123-125 °C @ Press: 2 Torr
Density 1.029-1.031 g/cm³ @ Temp: 25 °C
Flash Point 137 °C
Appearance Transparent yellow or brown viscous liquid.
Color Yellow to Very Dark Brown to Thick
Form neat
Water Solubility <0.1 g/100 mL at 20 ºC
Vapor Pressure 0.035Pa at 25℃
Refractive Index 1.569~1.571
Log P 3.39
How is Ethoxyquin classified and handled safely? Learn More
Warning
GHS07· Irritant GHS09· Environmental Hazard GHS08· Health Hazard
Hazard Statements
H302 Harmful if swallowed
H317 May cause an allergic skin reaction
H320 Causes eye irritation
H370 Causes damage to organs
H372 Causes damage to organs through prolonged or repeated exposure
H411 Toxic to aquatic life with long lasting effects
Precautionary Statements
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
P270 Do not eat, drink or smoke when using this product.
Which trade and regulatory codes apply to Ethoxyquin?
HS Code 29334900
Storage Class 10 - Combustible liquids
WGK (Germany) 1