Pyrogallic acid
CAS 87-66-1
EC 201-762-9
Formula C6H6O3
MW 126.11 g/mol
Organic Acids Personal Care & CosmeticsFood & NutritionPharmaceuticals & Healthcare Antioxidant & StabilizerPreservation & Biocide
Description
Pyrogallic acid (CAS 87-66-1), also known as pyrogallol, Pyro, Piral, and C.I. 76515, is a trihydroxybenzene compound produced by decarboxylation of gallic acid. It carries no assigned E-code and is classified under organic acids with the molecular formula C6H6O3.
In personal care formulations, pyrogallol functions as an oxidative hair dye intermediate, reacting with hydrogen peroxide to produce brown to black color deposits on the hair shaft. In food and pharmaceutical applications, its three adjacent hydroxyl groups enable strong free radical scavenging, making it effective as an antioxidant and preservative against lipid oxidation and microbial degradation.
Pyrogallic acid is supplied as a very fine crystalline powder meeting Ph.Eur. and technical-grade specifications, with REACH compliance documentation available. It is classified under HS code 29072200. Standard packaging formats and batch documentation can be confirmed at the point of inquiry.
In personal care formulations, pyrogallol functions as an oxidative hair dye intermediate, reacting with hydrogen peroxide to produce brown to black color deposits on the hair shaft. In food and pharmaceutical applications, its three adjacent hydroxyl groups enable strong free radical scavenging, making it effective as an antioxidant and preservative against lipid oxidation and microbial degradation.
Pyrogallic acid is supplied as a very fine crystalline powder meeting Ph.Eur. and technical-grade specifications, with REACH compliance documentation available. It is classified under HS code 29072200. Standard packaging formats and batch documentation can be confirmed at the point of inquiry.
Physical Properties
| 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 |
Safety & Handling (Learn More)
Warning GHS07 GHS08
H
H302H312H313H315H316H317H319H332H335H341H370H371H412H302+H312+H332
P
P203P260P261P264P270P271P272P273P280P317P318P319P321P330P405P501P264+P265P301+P317P302+P317P302+P352P304+P340P308+P316P332+P317P333+P317P337+P317P362+P364P403+P233P305+P351+P338
Trade & Regulatory
| HS Code | 29072200 |
| UN Number | 2811 |
| ADR Class | 6.1 |
| Packing Group | III |
| Storage Class | 11 - Combustible Solids |
| WGK (Germany) | 3 |
Other Names
benzene-1,2,3-triolPyroPiralPyrogallolC.I. 76515Fourrine 85Fourrine PGFouramine Brown AP1,2,3-Benzenetriol
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