Description

Chlorophenol Red is a high-purity, synthetic organic compound widely used as a pH indicator and biological stain. This product is essential for researchers and industrial laboratories requiring precise visual endpoints in titration experiments and histological studies. It is particularly valuable for professionals in the biotechnology, pharmaceutical, and chemical manufacturing sectors who demand reliable, consistent quality for critical analytical and diagnostic procedures.

Application

• pH Indicator: Used in analytical chemistry for titrations within its transition range (pH 4.8 to 6.7), changing from yellow to red-violet.
• Biological Staining: Employed in microbiology and histology as a contrast stain for visualizing cellular structures and tissues.
• Diagnostic Reagents: A key component in the formulation of certain clinical diagnostic kits and test strips.
• Research & Development: Serves as a vital tool in biochemical assays and life science research for monitoring pH changes.
• Educational Laboratories: Used in university and training labs to demonstrate acid-base chemistry and indicator principles.
• Industrial Process Monitoring: Applied in specific manufacturing processes where visual pH monitoring is required.

Basic Information

Product Name	Chlorophenol Red
CAS No.	38387-93-8
Molecular Formula	C19H12Cl2O5S
Molecular Weight	423.27 g/mol
Synonyms	3',3''-Dichlorophenolsulfonphthalein; 4,5,6,7-Tetrachloro-2',4',5',7'-tetraiodofluorescein (related dye class); Chlorphenol Red; CPR; NSC 9241; Phenol, 4,4'-(3H-2,1-benzoxathiol-3-ylidene)bis[2,6-dichloro-, S,S-dioxide; 1,1-Dioxo-3H-phenoxathin-3-ylidenebis(2,6-dichlorophenol)
EINECS	Contact for details

Quality Control

Our Chlorophenol Red is manufactured under strict quality management systems. Each batch undergoes rigorous analytical testing, including identification by infrared spectroscopy (IR), purity assay by HPLC, and checks for specific impurities. A comprehensive Certificate of Analysis (COA) detailing all test results and specifications is provided with every shipment to ensure traceability and compliance with your quality requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at a controlled room temperature (typically 15-25°C). Keep away from heat, sparks, and open flame. The product is light-sensitive and should be stored away from direct light exposure.

Specification

Item	Specification
Appearance	Dark red to brownish-red powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
pH Transition Range	4.8 (yellow) - 6.7 (red-violet)
Loss on Drying	≤ 2.0 %
Residue on Ignition	≤ 0.5 %
Heavy Metals (as Pb)	≤ 20 ppm

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