Organic Acids
REACH
Pyrogallol
CAS Number
87-66-1
EC Number
201-762-9
What is Pyrogallol?
Pyrogallol (CAS 87-66-1), also sold under the trade names Piral, Fourrine PG, and Fourrine 85, is a trihydric phenol used industrially as an antioxidant and reducing agent.
Where is Pyrogallol used?
- Pharmaceutical, cosmetic and specialty chemical: fixative
- Hair dye and cosmetic colorant systems: oxidative dye coupler for brown and black shades
- Pharmaceutical manufacturing: intermediate in active compound synthesis and antioxidant stabilizer
- Photographic and analytical chemistry: developing agent and oxygen-absorbing reagent
- Food-contact and packaging applications draw on its antioxidant properties.
Commercial specifications
- Technical and reagent-grade specifications are standard; pharmaceutical-grade material meets compendial purity requirements.
- Packaging ranges from kilogram-scale laboratory quantities to multi-hundred kilogram bulk orders.
Other Names (Synonyms)
Piral|Fourrine PG|Fourrine 85|Fouramine Brown AP|Fouramine base ap|C.I. Oxidation Base 32|Benzene-1,2,3-triol|2,3-Dihydroxyphenol
What are the physical properties of Pyrogallol?
Melting Point 133 °C
Boiling Point 309 °C
Density 1.453 g/cm³ @ Temp: 4 °C
Flash Point >230 °F
Appearance white crystalline solid
Color White
Form Very Fine Crystalline Powder
Water Solubility 400 g/L (25 ºC)
Vapor Pressure 10 mm Hg ( 167.7 °C)
Refractive Index n 20/D 1.387
pH 4-5 (50g/l, H2O, 20℃)
Log P -0.47
How is Pyrogallol classified and handled safely? Learn More
Warning
GHS07· Irritant GHS08· Health Hazard
Hazard Statements
H302 Harmful if swallowed
H312 Harmful in contact with skin
H313 May be harmful in contact with skin
H315 Causes skin irritation
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.
Which trade and regulatory codes apply to Pyrogallol?
HS Code 29072200
UN Number 2811
ADR Class 6.1
Packing Group III
Storage Class 11 - Combustible Solids
WGK (Germany) 3