Antioxidants
REACH
Methylhydroquinone
CAS Number
95-71-6
EC Number
202-443-7
What is Methylhydroquinone?
Methylhydroquinone (CAS 95-71-6), also known as 2,5-Dihydroxytoluene, is a substituted hydroquinone derivative used as an antioxidant and UV stabilizer.
Where is Methylhydroquinone used?
- Plastics and polymers: polymerization inhibitor preventing premature crosslinking during storage and processing of reactive monomers and resins
- Cosmetics: antioxidant stabilization of topical formulation matrices
- Flavor and fragrance: aroma contribution and preservative component in finished flavor systems
- Pharmaceuticals: synthetic intermediate for active ingredients and specialty fine chemicals
- It scavenges free radicals to control oxidative degradation or premature cure during manufacturing.
Commercial specifications
- Purity typically 98% or higher
- Packaging from kilogram-scale bags to bulk drums
Other Names (Synonyms)
2-Methylhydroquinone|2-methylbenzene-1,4-diol|2,5-Dihydroxytoluene|p-Toluhydroquinone|p-Toluquinol|p-Toluhydroquinol|1,4-Benzenediol, 2-methyl-|Hydroquinone, methyl-
What are the physical properties of Methylhydroquinone?
Melting Point 128 °C
Boiling Point 283.00 °C @ Press: Atm pressure
Density 2.35 g/cm³
Flash Point 172 °C
Appearance white solid
Color Grayish-white to light beige
Form Crystalline Powder
Water Solubility 77 g/L (25 ºC)
Vapor Pressure 0.004Pa at 25℃
Refractive Index 1.4922 (estimate)
Log P 0.9 at 27℃
How is Methylhydroquinone classified and handled safely? Learn More
Danger
GHS05· Corrosive GHS07· Irritant GHS08· Health Hazard GHS09· Environmental Hazard
Hazard Statements
H302 Harmful if swallowed
H315 Causes skin irritation
H317 May cause an allergic skin reaction
H318 Causes serious eye damage
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
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 Methylhydroquinone?
HS Code 29072900
Storage Class 8A - Combustible corrosive hazardous materials
WGK (Germany) 2