Catechol

CAS Number
120-80-9
EC Number
204-427-6
Chemical Formula
C6H6O2
Molecular Weight
110.11 g/mol

Description

Catechol (CAS 120-80-9), also known as Pelagol Grey C and oxyphenic acid, is an aromatic diol used across personal care, pharmaceutical, and industrial manufacturing. It functions primarily as an antioxidant and intermediate. In cosmetics and hair care, it acts as an oxidative coupler in permanent hair dye formulations, producing grey and dark tones when combined with primary intermediates. It is essential for achieving specific color profiles.

Pharmaceutical manufacturers use it as a key synthetic intermediate in the production of catecholamine-based active ingredients. This includes certain cardiovascular and neurological compounds used in modern medicine. In the textile and leather industries, it contributes to dyeing processes and tanning formulations where controlled oxidative chemistry is required. It ensures consistent results in industrial chemical processing.

As a stabilizer and antioxidant, it is incorporated into industrial formulations to inhibit oxidative degradation in rubber and polymer processing. This extends the lifespan and durability of various synthetic materials. The product is supplied as white to off-white crystalline flakes or powder. Technical grade is the standard offering for industrial and dyestuff applications, while higher-purity grades are available for specific needs.

These higher-purity grades are designed to meet pharmaceutical intermediate specifications. Packaging typically ranges from small drums to bulk quantities depending on the specific application requirements of the client.

Other Names (Synonyms)

Phthalic alcohol|Pelagol Grey C|Oxyphenic acid|O-Phenylenediol|o-hydroxyphenol|O-Hydroquinone|O-Dioxybenzene|o-Dihydroxybenzene

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

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Physical Properties

Melting Point 105 °C
Boiling Point 245.5 °C @ Press: 760 Torr
Density 1.344 g/cm³
Flash Point 279 °F
Appearance Catechol is a white crystalline solid. Turns brown on contact with light and air.
Color white to faintly beige
Form Crystalline Flakes
Water Solubility 430 g/L (20 ºC)
Vapor Pressure 1 mm Hg ( 75 °C)
Refractive Index 1.6120 (estimate)
pH 6 (100g/l, H2O, 20℃)
Log P 0.93

Documentation

Safety & Handling Learn More

Danger
GHS06· Toxic GHS08· Health Hazard GHS07· Irritant GHS05· Corrosive

Hazard Statements

H301 H301
H302 H302
H311 H311
H312 H312

Precautionary Statements

P203 P203
P260 P260
P261 P261
P262 P262

Trade & Regulatory

HS Code 29072900
UN Number 2811
ADR Class 6.1
Packing Group III
Storage Class 6.1C - Combustible acute toxic Cat.3 toxic compounds or compounds which causing chronic effects
WGK (Germany) 2
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