Custom Fluorescent Whitening Agent ER-III Supplier
  • Fluorescent Whitening Agent ER-III
  • Fluorescent Whitening Agent ER-III Zhejiang Hongyi Chemical Co., Ltd.

Fluorescent Whitening Agent ER-III

C.I.: 199:2 CAS NO: 13001-40-6

Chemical name
1,4-Bis(4-cyanostyryl)benzene 
Structural formula

Main purpose
Suitable for brightening and enhancing the vibrancy of polyester and polyester blends, as well as for brightening acetate fibers; it offers exceptionally high whiteness. When used in combination with ER-I and ER-II, this product improves thermal stability and adjusts the color tone.

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Product Brochure
Quality and Technical Specifications
Appearance Bright yellow-green powder
Purity ≥98.5%
Color Greenish
UV Absorption Wavelength 289–291°C
Extinction Coefficient at 1% ≤0.3%
Molecular Weight 332.39
Storage Method
25KG per carton/drum It is highly stable when stored at room temperature and should be kept in a dry place away from light.
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About Us
Zhejiang Hongyi Chemical Co., Ltd.
Established in 2018, Zhejiang Hongyi Chemical Co., Ltd. is strategically located in the industrial zone of Longquan City, Zhejiang Province. Over the years, the company has made significant strides in its development, establishing a robust research and development center and two production bases. Hongyi has forged collaborative research partnerships with several renowned universities in China, contributing to the formulation of national standards. As a national Zhejiang Hongyi Chemical Co., Ltd. high-tech enterprise and custom Optical Brightener CBS-X supplier, Hongyi specializes in the research, development, manufacturing, and technical services of Optical Brightener CBS-X.
Hongyi's market share in the field of Optical Brightener CBS-X continues to expand significantly. We are deeply committed to serving our domestic end customers and are actively extending our reach into the European, African, and Southeast Asian markets. Our efforts have established an overseas office in Hai Phong, Vietnam.
As we look towards the 21st century, Hongyi is dedicated to continuous innovation and market-driven development. We prioritize our customers' needs and strive to provide reliable quality, efficient and convenient application technology services, and cost-effective solutions to create value for all our partners. We are eager to accompany you with sincerity and work together to build a bright future.
Qualification Certificate
  • A Method for Preparing a Nano-TiO₂ Composite Fluorescent Brightener
  • Processing equipment for a fluorescent brightener
  • A fluorescent brightening composition, method for preparing the same, and application thereof
  • High-Tech Enterprise Certificate
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