Description

Chlorophenol Red is a high-purity, synthetic organic compound widely used as a sensitive pH indicator dye. Its distinct color transition from yellow to red-violet between pH 4.8 and 6.7 makes it an indispensable tool for precise endpoint detection in analytical chemistry and life science research. This product is essential for professionals in pharmaceutical quality control, academic laboratories, and industrial process monitoring who require reliable and consistent visual indicators for titrations and pH assessments.

Application

• pH Indicator in Titrations: Primary use as a visual endpoint indicator in acid-base titrimetric analysis within its transition range.
• Microbiological & Cell Culture Media: Used as a pH indicator in various prepared culture media to monitor metabolic activity and environmental changes.
• Clinical & Diagnostic Reagents: A component in diagnostic kits and reagents for biochemical assays and urinalysis strips.
• Research & Development: Employed in laboratory research for spectrophotometric methods and as a tracer or marker in experimental protocols.
• Educational Laboratories: A standard reagent for teaching fundamental principles of acid-base chemistry and indicator theory.
• Industrial Process Control: Monitoring pH in specific non-critical industrial processes where its color range is applicable.

Basic Information

Product Name	Chlorophenol Red
CAS No.	4430-20-0
Molecular Formula	C19H12Cl2O5S
Molecular Weight	423.27 g/mol
Synonyms	3',3''-Dichlorophenolsulfonephthalein; 4,4'-(3H-2,1-Benzoxathiol-3-ylidene)bis[2,6-dichlorophenol] S,S-Dioxide; Chlorophenol Red Indicator; NSC 9245; 2,6-Dichloro-4-[3-(2,6-dichloro-4-hydroxyphenyl)-1,1-dioxo-1,2-benzoxathiol-3-yl]phenol; CPR
EINECS	224-619-4

Quality Control

Our Chlorophenol Red is manufactured under a strict quality management system to ensure batch-to-batch consistency and high performance. Each lot undergoes comprehensive analytical testing, including identity confirmation by IR spectroscopy, purity assessment by HPLC, and verification of its precise pH transition range. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee compliance with your application requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at controlled room temperature (15-25°C). Keep away from incompatible materials and sources of ignition.

Specification

Item	Specification
Appearance	Reddish-brown to dark brown powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 95.0%
pH Transition Range	4.8 (yellow) - 6.7 (red-violet)
Loss on Drying	≤ 2.0 %
Residue on Ignition (Sulfated Ash)	≤ 0.5 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.