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2-7-523 जिदोंग बिल्डिंग मटेरियल तांगशान, हेबै 064000 चीन
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Direct Red 28

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Synonyms:
C.I.22120;Disodium3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis(4-aminonaphthalene-1-sulphonate)
CAS No.:
573-58-0
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Description
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Chemical Name

Direct Red 28

Synonyms

C.I.22120;Disodium3,3'-[[1,1'-biphenyl]-4,4'-diylbis(azo)]bis(4-aminonaphthalene-1-sulphonate)

CAS No.

573-58-0

Molecular formula

C32H22N6वह2O6S2

EINECS No.

209-358-4

Molecular weight

696.66

Molecular Structure

Details

Appearance: brownish red powder

pH change range: 3.0(blue)~5.2(red)

Water Soluble Test: pass

Loss on drying: 5.0% max.

Sulfated ash(as SO4): 27% max.

Main Application

Used as pH-indicator, adsorption indicator and biological dye, etc.

 

Key Features
High Purity
Our Direct Red 28 is available in high - purity grades. The minimum purity of our standard product is 98%, and for premium products, it can reach up to 99.5%. Stringent quality control measures are implemented throughout the production process. Each batch undergoes comprehensive testing for purity, solubility, and color intensity. This ensures that our product consistently meets and exceeds the highest industry standards, providing you with a reliable and high - performing colorant.
Excellent Color Fastness
Direct Red 28 exhibits excellent color fastness properties. When used in dyeing applications, it can withstand various environmental factors such as light, washing, and rubbing without significant fading. This makes it ideal for applications where long - lasting color is required, such as in the textile and paper industries. The strong color retention ensures that the dyed materials maintain their vibrant appearance over time.
Versatile Dyeing Capability
It has a versatile dyeing capability and can be used to dye a wide range of materials. In the textile industry, it can effectively dye cellulose - based fibers such as cotton, linen, and rayon. In the paper industry, it can be used to color paper products, providing them with a rich red hue. Additionally, it can be used in leather dyeing and some food - related applications (where permitted) due to its compatibility with different substrates.
 
Applications
Textile Industry
  • Cellulose Fiber Dyeing: Direct Red 28 is widely used in the textile industry for dyeing cellulose - based fibers. It can produce a deep and vivid red color on cotton fabrics, which is highly desirable in the production of clothing, home textiles, and industrial fabrics. The dyeing process is relatively simple and cost - effective, making it a popular choice for textile manufacturers. For example, in the production of red - colored cotton T - shirts, Direct Red 28 can provide a consistent and long - lasting color that resists fading even after multiple washes.
  • Fabric Printing: It is also used in fabric printing processes. The high solubility of Direct Red 28 allows it to be easily incorporated into printing pastes, enabling the creation of intricate red - colored patterns on fabrics. This is commonly seen in the production of printed curtains, upholstery fabrics, and fashion garments.
Paper Industry
  • Paper Dyeing: In the paper industry, Direct Red 28 is used to color various types of paper products. It can be added to the pulp during the paper - making process to produce red - colored papers for applications such as stationery, packaging, and decorative papers. The dye evenly distributes in the pulp, resulting in a uniform and attractive red color throughout the paper. For instance, red - colored gift - wrapping papers often use Direct Red 28 to achieve their vibrant appearance.
  • Paperboard and Cardstock: It is also suitable for coloring paperboard and cardstock, which are used in the production of boxes, folders, and other packaging materials. The excellent color fastness of Direct Red 28 ensures that the printed or dyed paperboard products maintain their color integrity during storage and transportation.
Leather Industry
  • Leather Dyeing: Direct Red 28 can be used to dye leather, imparting a rich red color to the leather surface. It penetrates the leather fibers effectively, providing a long - lasting and uniform color. This is useful in the production of leather goods such as handbags, shoes, and furniture upholstery. The dye can enhance the aesthetic appeal of the leather products and make them more visually appealing to consumers.
Other Applications
  • Biological Staining: In some biological applications, Direct Red 28 can be used as a staining agent. It can bind to certain biological materials, such as proteins and polysaccharides, allowing for their visualization under a microscope. For example, in histological studies, it can be used to stain tissue sections to highlight specific structures.
  • Food Industry (where permitted): In some regions where it is approved for food use, Direct Red 28 can be used as a food colorant. It can be added to certain food products such as confectionery, beverages, and dairy products to enhance their visual appeal. However, strict regulations govern its use in the food industry to ensure safety.

Safety Information
Hazard Statements
  • Direct Red 28 may be harmful if swallowed, inhaled, or absorbed through the skin.
  • Prolonged or repeated exposure may have adverse effects on health. Some studies have suggested potential carcinogenicity, although the exact risks are still under investigation.
  • Contact with strong oxidizing agents can lead to dangerous reactions.
Precautionary Measures
  • When handling this product, always wear appropriate personal protective equipment, including chemical - resistant gloves, safety goggles, and a lab coat or protective apron.
  • Work in a well - ventilated area, preferably under a fume hood, to avoid inhalation of dust or fumes.
  • In case of contact with skin, immediately wash the affected area with plenty of water for at least 15 minutes and seek medical advice. If the compound gets into the eyes, rinse the eyes thoroughly with water for at least 15 minutes, lifting the eyelids occasionally, and then seek immediate medical attention.
  • Do not eat, drink, or smoke in the area where Direct Red 28 is being used.
भंडारण
  • Store Direct Red 28 in a cool, dry place, away from direct sunlight and heat sources.
  • Keep it in a tightly sealed container to prevent moisture absorption and contact with air, which could potentially affect its chemical properties and color quality.
  • Store it separately from incompatible substances such as strong oxidizing agents and acids to avoid dangerous reactions.

Why Choose Our Product?
Quality Assurance
Our manufacturing process adheres to strict international standards. We operate a state - of - the - art production facility equipped with advanced analytical instruments for continuous quality monitoring. Each batch of Direct Red 28 is thoroughly tested for purity, color fastness, and dyeing performance. This ensures that our product consistently meets and exceeds the highest industry standards, providing you with a reliable and high - performing colorant.
Customized Solutions
We understand that different customers have unique requirements. Whether you need a specific purity level, a particular packaging size, or a customized formulation for your specific application, our team of experts can work with you to develop a tailored solution. We are committed to providing personalized service to meet your exact needs, ensuring that you get the most suitable product for your use.
Competitive Pricing
Despite our focus on delivering top - quality products, we offer Direct Red 28 at competitive prices. We strive to balance cost - effectiveness with product excellence, providing you with the best value for your investment. Our pricing structure is transparent, with no hidden fees, allowing you to make informed purchasing decisions.
Fast and Reliable Delivery
We have an extensive global logistics network in place. Once you place an order, we ensure prompt processing and delivery. Our team works closely with reliable shipping partners to guarantee that your product reaches you in a timely manner, regardless of your location. We also provide tracking information, enabling you to monitor the progress of your shipment and plan your operations accordingly.
Order Now
Ready to experience the benefits of our high - quality Direct Red 28? Place your order today by contacting our sales team at [phone number] or [email address]. Our dedicated and knowledgeable staff are ready to assist you with any questions or concerns you may have. We look forward to partnering with you and becoming your trusted supplier for all your Direct Red 28 needs.
 

Is Direct Red 28 safe for skin?


Direct Red 28 (also known as Congo Red) is not considered safe for direct skin contact or cosmetic use. While it has been historically used as a biological stain and textile dye, studies indicate potential skin irritation and sensitization risks. The compound can penetrate skin barriers and has been linked to allergic reactions in some individuals. Regulatory agencies classify it as a possible carcinogen based on animal studies, restricting its use in products that contact skin. Proper protective equipment (gloves, lab coats) is recommended when handling this dye in industrial or laboratory settings to minimize exposure risks.

 

What is Direct Red 28 used for?


Direct Red 28, commonly called Congo Red, is primarily used as a histological stain in microscopy to detect amyloid fibrils in tissues, where it exhibits a characteristic red-to-green birefringence under polarized light. Industrially, it serves as a textile dye for cotton and silk due to its vivid red color. In research, it aids in studying protein aggregation diseases like Alzheimer’s. However, its use has declined in consumer textiles due to toxicity concerns, with safer synthetic alternatives now preferred for dyeing applications.

 

What is another name for Direct Red 28?


The most widely recognized alternative name for Direct Red 28 is Congo Red, derived from its early use in dyeing African cotton. It’s also classified as C.I. 22120 in the Color Index system. In scientific literature, it may be referred to by its chemical name, disodium 3,3′-([1,1′-biphenyl]-4,4′-diyl)bis(4-aminonaphthalene-1-sulfonate). These names are used interchangeably depending on the context—textile industry, biological staining, or chemical research—though "Congo Red" remains the most common colloquial term.

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