Description

Blankophor Bkl is a high-performance optical brightener agent (OBA) widely recognized for its superior whitening and brightening effects on various substrates. This compound is essential for manufacturers seeking to enhance the visual appeal and perceived quality of their products by compensating for yellowish tints. It is a critical additive for industries where brilliant whiteness and color correction are paramount. The product is supplied under the identifier CAS No. 61968-72-7.

Application

Blankophor Bkl is engineered for a diverse range of industrial applications where optical brightening is required:

• Synthetic Fiber Production: Primarily used in the melt-spinning of polyester (PET) and polyamide fibers to achieve a permanent, brilliant white appearance.
• Plastics and Polymer Masterbatches: Incorporated into engineering plastics, films, and injection-molded articles to improve brightness and mask inherent yellowness.
• Detergent and Laundry Care Formulations: Acts as a key fluorescent whitening agent in premium laundry detergents and fabric softeners to make white textiles appear brighter and colors more vivid.
• Paper and Board Manufacturing: Applied in coating formulations and mass coloration to produce high-brightness printing papers and packaging materials.
• Textile Finishing: Used in finishing baths for textiles to provide an optical whitening effect, especially on cotton and blended fabrics.

Basic Information

Product Name	Blankophor Bkl
CAS No.	61968-72-7
Molecular Formula	C₄₀H₄₂N₁₂O₆S₂
Molecular Weight	843.0 g/mol
Synonyms	2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole; 4,4'-Bis(benzoxazol-2-yl)stilbene; Fluorescent Brightener 135; Tinopal CBS-X; OB-1; C.I. Fluorescent Brightener 135; Blankophor P167
EINECS	263-360-5

Quality Control

Every batch of Blankophor Bkl is manufactured under a strict quality management system. We ensure the product meets consistent specifications for key parameters such as purity, hue, and thermal stability, which are critical for performance in demanding applications. Certificates of Analysis (COA) detailing assay, impurity profile, and physical properties are provided with each shipment to guarantee supply reliability and batch-to-batch consistency.

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). Keep away from heat sources and incompatible materials. The product is light-sensitive and should be stored away from direct light exposure to maintain its efficacy.

Specification

Item	Specification
Appearance	Yellowish-green powder or granules
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.5%
Melting Point	358 - 362 °C
Loss on Drying	≤ 0.5%
Ash Content	≤ 0.2%
Fluorescence Intensity	≥ 100% of standard
Whiteness Index (on PET)	As per customer requirement

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