Sulphur black BR (CAS 1326-82-5) is a dye mainly used for dyeing cotton textiles.

The following is detailed information about sulfur black BR:

1. * * Basic Information * *:

-CAS number: 1326-82-5

-Chinese name: Sulfide Black BR

-English name: Sulph Black BR

-Molecular formula: C6H4N2O5

-Molecular weight: 184.11

2. * * Physical and chemical properties * *:

-Appearance: Black phosphorus flake solid or black viscous liquid (specific form may vary depending on manufacturer and product specifications).

-Solubility: insoluble in water and ethanol, but soluble in sodium sulfide solution and appears dark green.

-Reactivity: precipitates in a green and black color in hydrochloric acid; Blue in sodium hydroxide solution; Slightly dissolved in concentrated sulfuric acid when cooled, heated to darken the green light blue precipitate, further heated to transform into black blue, diluted to produce green light blue precipitate.

3. * * Purpose * *:

-Mainly used for dyeing cotton textiles, the dyeing effect is bright and uniform, with high color fastness.

-It can also be used for dyeing leather and paper.

4. * * Specifications and Packaging * *:

-The specifications of sulfur black BR vary from manufacturer to manufacturer, but usually include indicators such as appearance, color, moisture, insoluble content in sodium sulfide, and free sulfur content.

-The packaging forms include iron drums with a net weight of 25 kilograms, woven bags, cardboard boxes, etc.

5. * * Precautions * *:

-Sulfide black dye is a polymer compound with high sulfur content, which contains unstable disulfide and polysulfide bonds in its structure. It is easily oxidized into sulfur oxides and further reacts with water molecules to generate sulfuric acid, which may reduce the strength of the yarn and cause fiber brittleness.

-After dyeing with sulfur black dye, measures such as appropriate use of dye, thorough washing, and use of anti brittle agents should be taken to reduce or prevent fiber brittleness.

6. * * Production process * *:

-The production process of sulfur black BR mainly includes steps such as dye preparation, dissolution, filtration, and drying. During the process, attention should be paid to safety protection, sufficient stirring and dissolution, selecting appropriate filtering methods and filter paper, and controlling the temperature and humidity of the drying process.

 Our factory produce sulphur black BR for 30 years in China with various kinds of quality. 

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