Description

2-[4-[2-(4-Nitro-2-Sulphophenyl)Vinyl]-3-Sulphophenyl]-2H-Naphtho[1,2-D]Triazole-5-Sulphonic Acid is a high-purity, sulfonated triazole derivative with a complex conjugated structure, serving as a critical functional intermediate. Its primary value lies in its ability to act as a highly effective optical brightener and fluorescent whitening agent (FWA) for synthetic polymers and specialty coatings. This compound is essential for manufacturers in the plastics, synthetic fibers, and high-performance paint industries seeking to enhance product whiteness and brightness under UV light.

Application

• Optical Brightening Agent (OBA) for synthetic fibers including polyester, nylon, and acetate to improve visual whiteness.
• Fluorescent Whitening Agent (FWA) in the production of plastics and polymers, such as PVC and polystyrene, for consumer goods and packaging.
• Paper Brightening in high-grade paper manufacturing processes requiring superior optical properties.
• Detergent and Soap Formulation as a key additive to impart a "whiter-than-white" appearance to laundered fabrics.
• Advanced Coating Systems for automotive and industrial paints where long-term brightness stability is required.
• Textile Finishing for technical textiles that require enhanced luminosity and color correction.

Basic Information

Product Name	2-[4-[2-(4-Nitro-2-Sulphophenyl)Vinyl]-3-Sulphophenyl]-2H-Naphtho[1,2-D]Triazole-5-Sulphonic Acid
CAS No.	131-43-1
Molecular Formula	C30H18N4O10S3
Molecular Weight	690.67 g/mol
Synonyms	Blankophor BSU; Fluorescent Brightener 135; Tinopal CBS-X; 2H-Naphtho[1,2-d]triazole-5-sulfonic acid, 2-[4-[2-(4-nitro-2-sulfophenyl)ethenyl]-3-sulfophenyl]-; C.I. Fluorescent Brightener 135; 4,4'-Bis[(4-anilino-6-morpholino-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulfonic acid (related class); FWA CBS; Optical Brightener CBS
EINECS	205-024-3

Quality Control

Our production of 2-[4-[2-(4-Nitro-2-Sulphophenyl)Vinyl]-3-Sulphophenyl]-2H-Naphtho[1,2-D]Triazole-5-Sulphonic Acid adheres to stringent quality management systems to ensure batch-to-batch consistency and high purity. Every lot is tested against comprehensive specifications, including assay, impurity profile, and performance in application tests. Certificates of Analysis (COA) documenting purity, identity, and physical properties are provided with each shipment to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Keep away from heat sources and incompatible materials. Due to its light-sensitive nature, prolonged exposure to direct light should be avoided to maintain product integrity.

Specification

Item	Specification
Appearance	Yellow to light brown powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Moisture (KF)	≤ 5.0%
Sulfated Ash	≤ 0.5%
pH (1% Solution)	6.0 - 8.0
Fluorescence Intensity	≥ 95% of reference standard

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