para-xylenol blue, 125-31-5

Chemical Encyclopedia

February 25, 2026

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Chinese name: po-xylenol blue
english name: P-XYLENOL BLUE
chinese alias: p-Xylenol Sulfonphthalein; Xylenol Blue; Xylenol Blue; 1,4-dimethyl-5-hydroxybenzenesulfonphthalein
english alias:6-benzoxathiol-3-yl]-2,5-dimethylhenol p-Xylenolsulfonephthalein p-Xylenol Blue;4-[3-(4-hydroxy-2,5-dimethylphenyl)-1,1-dioxo-2,1λ6-benzoxathiol-3-yl]-2,5-dimethylphenol;
CAS No:125-31-5
chemical formula: C23H22O5S
molecular weight:410.483
density:1.309g/cm3
melting point:212°C (dec.)
refractive index:1.627
hazard Category Code: R36/37/38 Irritating to eyes, respiratory system and skin.
Dangerous Goods Marking: xi: Irritant substance
safety instructions: s24/25: Avoid contact with skin and eyes.