Description

2-Phenylbenzimidazole-5-Sulfonic Acid is a high-purity organic compound and a key intermediate in the synthesis of advanced UV absorbers. This compound matters for its critical role in enhancing the photostability and performance of polymers and sun care formulations. It is primarily needed by manufacturers in the personal care, specialty polymer, and fine chemical industries seeking reliable, high-quality raw materials for their production processes.

Application

• Primary UV Filter Synthesis: A crucial intermediate in the production of advanced, broad-spectrum organic UV absorbers (e.g., Ensulizole derivatives) for sunscreens and cosmetic products.
• Polymer Stabilization: Used to manufacture light stabilizers and antioxidants that protect plastics, coatings, and synthetic fibers from UV-induced degradation and yellowing.
• Fine Chemical Intermediate: Serves as a versatile building block in pharmaceutical research and the synthesis of other benzimidazole-based specialty chemicals.
• Industrial Coatings: Incorporated into formulations for automotive, architectural, and industrial coatings to improve weatherability and color fastness.
• Advanced Material Research: Utilized in R&D for developing novel photochromic materials, optical brighteners, and organic electronic components.

Basic Information

Product Name	2-Phenylbenzimidazole-5-Sulfonic Acid
CAS No.	27503-81-7
Molecular Formula	C₁₃H₁₀N₂O₃S
Molecular Weight	274.29 g/mol
Synonyms	2-Phenyl-1H-benzimidazole-5-sulfonic acid; PBSA; Phenylbenzimidazole Sulfonic Acid; Ensulizole Intermediate; 1H-Benzimidazole-5-sulfonic acid, 2-phenyl-; Eusolex 232; 2-Phenyl-5-sulfobenzimidazole; UV Absorber Intermediate
EINECS	Contact for details

Quality Control

Our 2-Phenylbenzimidazole-5-Sulfonic Acid is manufactured under a strict quality management system. Every batch undergoes rigorous analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting specifications for use in sensitive applications like cosmetics and polymers. A comprehensive Certificate of Analysis (COA) detailing purity, impurities, and physical parameters is provided with each shipment to guarantee traceability and compliance.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated place at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after opening to prevent moisture absorption, which can affect product quality and handling properties.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 10 ppm
Related Substances (HPLC)	Individual impurity ≤ 0.5%; Total impurities ≤ 1.5%

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