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The main uses of phenolphthalein are

1. Pharmaceutical raw materials in the pharmaceutical industry: Pharmaceutical laxatives, which can stimulate the intestinal wall, cause intestinal peristalsis and promote defecation. It is suitable for habitual and stubborn constipation and is available in various dosage forms such as tablets and suppositories.
2. For organic synthesis: It is mainly used in the synthesis of plastics, especially in the synthesis of diazazanaphthone polyaryletherone polyaryletherone polymers. This type of polymer has excellent heat resistance, water resistance, chemical corrosion resistance, heat aging resistance and good processability and formability. Many of the fibers, coatings and composite materials made from it are widely used in fields such as electronics and electrical appliances, mechanical equipment, transportation, هوافضا, atomic energy engineering and military.
3. It is used as an alkali indicator, an indicator for non-aqueous solution titration, and a reagent for chromatographic analysis