Description

C.I. Fluorescent Brightener 339 is a high-performance stilbene-based optical brightening agent (OBA) widely used to enhance the whiteness and brightness of various substrates. Its core value lies in its ability to absorb ultraviolet light and re-emit it as visible blue light, effectively counteracting yellowing and creating a brilliant, clean appearance. This product is essential for manufacturers in the textile, paper, detergent, and plastics industries seeking to improve the aesthetic appeal and perceived quality of their finished goods.

Application

• Textile Finishing: Primary application for whitening and brightening polyester, polyamide, and their blends during exhaust or pad-thermofix processes.
• Detergent & Laundry Care: Incorporated into laundry detergents, fabric softeners, and soaps to impart a "whiter-than-white" look to laundered fabrics.
• Paper Manufacturing: Used in coating formulations and pulp to achieve high brightness levels in fine papers, art papers, and board.
• Plastics & Polymers: Effective for brightening polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), and other synthetic polymers during processing.
• Synthetic Fiber Production: Applied in the mass pigmentation (dope dyeing) of synthetic fibers like polyester to ensure inherent whiteness.
• Cosmetics & Personal Care: Used in formulations where a brightening or whitening effect is desired, subject to regional regulatory approval.

Basic Information

Product Name	C.I. Fluorescent Brightener 339
CAS No.	60650-94-4
Molecular Formula	C₄₀H₄₀N₁₂O₈S₂
Molecular Weight	889.0 g/mol
Synonyms	Fluorescent Brightener 339; FB 339; Optical Brightener 339; OB 339; 2,2'-(1,2-Ethenediyl)bis[5-[4-[bis(2-hydroxyethyl)amino]-6-(phenylamino)-1,3,5-triazin-2-yl]amino]benzenesulfonic acid disodium salt; 4,4'-Bis[[4-[bis(2-hydroxyethyl)amino]-6-(phenylamino)-1,3,5-triazin-2-yl]amino]stilbene-2,2'-disulfonic acid disodium salt; Tinopal CBS-X; Blankophor BBH
EINECS	Contact for details

Quality Control

Our C.I. Fluorescent Brightener 339 is manufactured under a stringent quality management system. Every batch undergoes comprehensive analytical testing to ensure consistent performance, including HPLC assay for purity, spectrophotometric analysis for strength and hue, and tests for solubility and application performance. Certificates of Analysis (COA) documenting all relevant specifications are available upon request 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 room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); ensure the original container is securely sealed after each use to prevent moisture absorption and caking.

Specification

Item	Specification
Appearance	Yellowish-green powder or granules
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 95.0%
Strength (Spectrophotometry)	100 ± 3% (vs. Standard)
Moisture Content	≤ 5.0%
Ash Content	≤ 0.5%
Solubility in Water	Clear, yellow-green solution
pH (1% Solution)	7.0 - 9.0

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