Sulphur Blue BRN ( Sulphur Blue 7 )

Sulphur Blue BRN (C.I. Sulphur Blue 7) is a widely used sulfur dye known for its excellent dyeing properties on cellulosic fibers such as cotton and viscose. This blue dye offers exceptional fastness to light and washing, making it a preferred choice for industrial applications requiring deep, vibrant blue shades. Sulphur Blue BRN is suitable for exhaust and continuous dyeing processes, delivering stable and uniform results even under demanding conditions. Its affinity for cellulosic materials, along with its strong reductive dyeing characteristics, makes it ideal for producing durable and high-quality fabrics.

Chemical and Technical Specifications:

• Chemical Name: 1,4,5,8-Tetraaminoanthraquinone

• C.I. Number: 53440

• Molecular Formula: C22H14N4O2

• Molecular Weight: 366.37 g/mol

• Solubility: Soluble in reducing agents, forms leuco dye in alkaline reducing baths

• Dyeing Method: Exhaust dyeing, continuous dyeing

• Lightfastness (Blue Wool Scale): 5-6 (good resistance to fading under light exposure)

• Washfastness: Excellent, rated 4-5

• pH Range: Effective in alkaline conditions during reduction

• Appearance: Dark blue powder

Industrial Applications:

1. Textile Industry:
   Sulphur Blue BRN is primarily used for dyeing cellulosic fibers like cotton, viscose, and jute. It produces rich, dark blue shades with uniformity and high fastness properties. The dye is suitable for both exhaust and continuous dyeing processes, often used in garment dyeing and fabric production for fashion textiles, workwear, and home textiles.

2. Denim Production:
   In the denim industry, Sulphur Blue BRN is used to create deep blue tones in denim fabrics. It is frequently combined with other sulfur dyes or indigo for various wash-down effects, adding versatility to denim production while maintaining excellent wash and lightfastness.

3. Yarn Dyeing:
   The dye is also employed in yarn dyeing, ensuring consistent color saturation and strong adhesion to fibers. It provides excellent penetration and evenness, especially for yarns used in woven and knitted fabrics.

4. Leather Dyeing:
   Sulphur Blue BRN can be applied in the dyeing of leathers, providing a durable and fade-resistant blue color, especially for products like upholstery leather and shoes, where long-lasting performance is essential.

5. Paper Industry: This dye can be applied in the paper industry for coloring specialty papers and packaging materials.
   

Key Performance Benefits:

• High Fastness: Exhibits excellent fastness to light and washing, ensuring that colors remain vibrant and intact after multiple wash cycles.

• Good Penetration: Ensures deep dye penetration into the fibers, resulting in uniform coloration and strong adherence to cellulosic substrates.

• Stable in Alkaline Conditions: Performs effectively in the reductive dyeing process under alkaline conditions, providing reliable dyeing results in industrial operations.

• Versatile Application: Suitable for both exhaust and continuous dyeing, offering flexibility across a range of textile production processes.