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CAS 77-09-8 Phenolphthalein Fine Chemicals
02
introduce
Phenolphthalein is a versatile fine chemical with dual properties as an acid-base indicator and pharmaceutical raw material. It features sensitive pH color change response, stable chemical performance and broad application adaptability.
Widely used in laboratory analysis, industrial quality control, pharmaceutical formulation and organic synthesis, our products adhere to strict quality standards to ensure reliable performance and consistent supply for diverse application scenarios.
Widely used in laboratory analysis, industrial quality control, pharmaceutical formulation and organic synthesis, our products adhere to strict quality standards to ensure reliable performance and consistent supply for diverse application scenarios.
02
Physical and chemical properties
As a high-performance multi-functional chemical, phenolphthalein possesses key physicochemical characteristics as follows:
- Melting Point: 258-263 °C
- Density: 1.4±0.1 g/cm³
- Flash Point: 24 °C
- pH Color Change Range:
8.0 (colorless); 10.0 (red)
- Form: Solid, odorless and tasteless
- Solubility: Soluble in ethanol and dilute alkali solutions, slightly soluble in ether, insoluble in water - Stability: Stable under normal storage conditions, incompatible with strong oxidizing agents and alkalis.
- Melting Point: 258-263 °C
- Density: 1.4±0.1 g/cm³
- Flash Point: 24 °C
- pH Color Change Range:
8.0 (colorless); 10.0 (red)
- Form: Solid, odorless and tasteless
- Solubility: Soluble in ethanol and dilute alkali solutions, slightly soluble in ether, insoluble in water - Stability: Stable under normal storage conditions, incompatible with strong oxidizing agents and alkalis.
1. Sensitive Color Change Response: Exhibits clear and rapid color transition in specific pH range, ensuring accurate and reliable indication results in analytical and detection scenarios.
2. Broad Application Versatility: Functions as indicator, pharmaceutical raw material and organic synthesis intermediate, covering chemical analysis, medicine, industry and material science.
3. Practical Functional Diversity: The derived phenolphthalein test paper is simple to prepare and easy to use, enabling rapid detection of alkalis and ammonia gas.
4. Stable Quality Performance: High purity with low impurities, ensuring consistent efficacy in both laboratory precision analysis and industrial large-scale applications.
1. Acid-Base Indication: Widely used as indicator in laboratory titration analysis and industrial quality control, such as pH monitoring in chemical production and textile printing and dyeing processes; used to prepare phenolphthalein test paper for rapid detection of alkalis and ammonia gas.
2. Pharmaceutical Industry: Serves as raw material for laxative drugs, suitable for treating habitual intractable constipation with various formulations like tablets and suppositories, featuring mild laxative effect and low intestinal spasm risk.
3. Organic Synthesis: Key intermediate for synthesizing high-performance polymers (e.g., polyaryletherketone derivatives), which are applied in electronics, mechanical equipment, aerospace, atomic energy engineering and military fields due to excellent heat resistance, water resistance and chemical stability.
4. Other Fields: Used as reagent in chromatographic analysis and non-aqueous titration, supporting scientific research and fine chemical production.
2. Pharmaceutical Industry: Serves as raw material for laxative drugs, suitable for treating habitual intractable constipation with various formulations like tablets and suppositories, featuring mild laxative effect and low intestinal spasm risk.
3. Organic Synthesis: Key intermediate for synthesizing high-performance polymers (e.g., polyaryletherketone derivatives), which are applied in electronics, mechanical equipment, aerospace, atomic energy engineering and military fields due to excellent heat resistance, water resistance and chemical stability.
4. Other Fields: Used as reagent in chromatographic analysis and non-aqueous titration, supporting scientific research and fine chemical production.
We implement strict full-process quality inspection, with each batch of products undergoing rigorous testing on key indicators such as purity, melting point, color change sensitivity and stability to meet international standards for reagent and pharmaceutical grades.
Equipped with a stable raw material supply chain and advanced production facilities, we ensure continuous large-scale supply. Our professional technical team provides tailored services including application guidance and formulation optimization advice.
Equipped with a stable raw material supply chain and advanced production facilities, we ensure continuous large-scale supply. Our professional technical team provides tailored services including application guidance and formulation optimization advice.
As a classic multi-functional fine chemical, phenolphthalein plays an irreplaceable role in chemical analysis, pharmaceutical health and advanced material synthesis. With stable product quality, diversified application scenarios and reliable supply capacity, we are committed to providing high-quality products and professional services for global customers.
Choose our phenolphthalein to meet your application needs in laboratory research, industrial production and pharmaceutical formulation. Contact us for more product details and cooperation support.
Choose our phenolphthalein to meet your application needs in laboratory research, industrial production and pharmaceutical formulation. Contact us for more product details and cooperation support.


