Phenolphthalein
CAS 77-09-8
EC 201-004-7
Formula C20H14O4
MW 318.32 g/mol
UV Absorbers & Stabilizers Personal Care & CosmeticsTextile, Leather & PaperPrinting & Packaging UV Protection & StabilizationAntioxidant & StabilizerSurface Modification & Wetting
Description
Phenolphthalein (CAS 77-09-8, EC 201-004-7, formula C20H14O4) is a synthetic organic compound also referenced under the trade designations CI 764, BETZ 0212, and Fenolftalein. It carries no assigned E-code and is classified within the pigments and colorants category for industrial supply purposes.
In textile and paper processing, phenolphthalein functions as a pH-indicator colorant, undergoing a structural transition from colourless lactone to pink quinoid form above pH 8.2, enabling precise alkalinity control during bleaching and dyeing operations. In personal care formulations, it is incorporated as an antioxidant and UV-stabilising agent to retard oxidative degradation of sensitive ingredients.
Phenolphthalein is supplied as a white to light yellow crystalline powder under HS code 29322910 and is subject to REACH registration requirements within the European Union. Buyers should verify current regulatory status, as restrictions apply in certain end-use categories. Standard packaging formats and purity grades are available upon request.
In textile and paper processing, phenolphthalein functions as a pH-indicator colorant, undergoing a structural transition from colourless lactone to pink quinoid form above pH 8.2, enabling precise alkalinity control during bleaching and dyeing operations. In personal care formulations, it is incorporated as an antioxidant and UV-stabilising agent to retard oxidative degradation of sensitive ingredients.
Phenolphthalein is supplied as a white to light yellow crystalline powder under HS code 29322910 and is subject to REACH registration requirements within the European Union. Buyers should verify current regulatory status, as restrictions apply in certain end-use categories. Standard packaging formats and purity grades are available upon request.
Physical Properties
| Melting Point | 262.5 °C |
| Boiling Point | 417.49°C (rough estimate) |
| Density | 1.277 g/cm³ @ Temp: 32 °C |
| Flash Point | 24 °C |
| Appearance | white to light yellow crystal powde |
| Color | White to yellow-white |
| Odor | Odorless |
| Form | Solid |
| Water Solubility | <0.1 g/100 mL |
| Vapor Pressure | <0.00001 Pa ( 50 °C) |
| Refractive Index | 1.5400 (estimate) |
| pH | 7.8～10.0 |
| Log P | 2.410 |
Safety & Handling (Learn More)
Danger GHS08 GHS07
H
H317H319H341H350H351H360H361H372H401H412
P
P203P260P261P264P270P272P273P280P318P319P321P405P501P264+P265P302+P352P333+P317P337+P317P362+P364P305+P351+P338
Trade & Regulatory
| HS Code | 29322910 |
| Storage Class | 6.1C - Combustible acute toxic Cat.3 toxic compounds or compounds which causing chronic effects |
| WGK (Germany) | 3 |
Other Names
3,3-bis(4-hydroxyphenyl)-2-benzofuran-1-oneEx-LaxPruletFenolftaleinPhenolphthaleinaLiloPurgaTrilaxKoprol
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Raw Materials
Derivatives
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