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Detergents
Phenolphthalein
Formula:
C₂₀H₁₄O₄
GOST/CAS:
CAS 77-09-8
Phenolphthalein is a specialized organic indicator widely used in the manufacturing and quality control of household and industrial cleaning products. The product is a fine crystalline powder, poorly soluble in water but highly soluble in alcohols. Due to its unique ability to instantly change color upon variations in acidity levels pH, phenolphthalein is an indispensable component for visualizing chemical processes, monitoring the dosage of alkaline components, and formulating color-changing (signaling) detergent solutions.
Applications
Rinseability and Safety Control: Used in professional cleaning agents to verify the complete removal of alkaline solutions from surfaces (the disappearance of the magenta color guarantees surface safety).
Color-Signaling Liquid Detergents: Incorporated into the formulations of liquid soaps, car shampoos, and industrial cleaners as a visual indicator of pH levels and product potency upon dilution.
Household Chemical Manufacturing: Applied in laboratory analysis during soap-making and surfactant synthesis stages for rapid neutralization monitoring and free alkali determination.
Auto Care and Specialty Chemicals: Included in indicator compounds for testing filtration and cleaning systems, as well as in heavy-duty organic degreasers where strict control over the alkaline environment is critical.
Key Advantages
High Accuracy and Clarity: Provides an instant and distinct visual transition from colorless to bright magenta within the {pH} range of 8.2–10.0, allowing easy alkalinity control without analytical instruments.
Formulation Stability: Demonstrates excellent compatibility with anionic and non-ionic surfactants, as well as organic solvents, without impairing the washing performance of the finished product.
Cost-Efficient Dosage: Features high indicator sensitivity, meaning minimal dosages (fractions of a percent) are sufficient to achieve a pronounced visual effect.
Processing Adaptability: Easily introduced into liquid concentrates via pre-dissolution in an alcohol or glycol phase, ensuring finished formulation stability during storage.
Storage & Transportation
- Store in dry, cool, and ventilated warehouses in tightly closed original packaging, away from heat sources and open flames.
- Avoid exposure to direct sunlight and moisture, as the product is hygroscopic.
- Keep away from strong oxidizing agents and alkaline substances to prevent premature reactions.
- Transportation is possible via all types of covered transport while observing standard temperature regulations. The product is classified as safe for transport in regulated commercial quantities. Shelf life is 3 years from the date of manufacture.
Technical Specifications
Appearance
White or slightly yellowish crystalline powder
Molecular Weight
318.32 g/mol
Main Substance Mass Fraction
≥ 99.0%
Melting Point
258 – 262 °C
Visual Transition Range
pH 8.2 (colorless) — pH 10.0 (magenta)
Solubility
Soluble in ethanol, diethyl ether; poorly soluble in water
Supply info
- Multi-layer paper or polyethylene bags of 10 kg and 25 kg (for the powder form).
- Plastic bottles / canisters (in the form of a ready-to-use 1% hydro-alcoholic solution) upon request.
- Customized packaging options are available for large wholesale shipments.