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CAS

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8003-57-4

Direct Black 56 is a gray powder that exhibits red light grey color. It is soluble in water, resulting in a dark purple solution, but not soluble in alcohol. The dye solution turns gray blue in the presence of strong sulfuric acid and purple when diluted. It forms a dark precipitate when mixed with strong hydrochloric acid and a dark purple precipitate when mixed with concentrated hydrogen peroxide solution.

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  • 8003-57-4 Structure

  • Basic information

    1. Product Name: Direct Black 56
    2. Synonyms: Direct Black 56;Direct Fast Greay RLN;C.I. Direct black 56;C.I.Direct Black 56;Pyrazol Grey RLN;Saturn Grey LRN;Solar Grey 2R;Direct black 56 (C.I. 34170)
    3. CAS NO:8003-57-4
    4. Molecular Formula: C36H22N7Na3O10S3
    5. Molecular Weight: 877.76509
    6. EINECS: N/A
    7. Product Categories: N/A
    8. Mol File: 8003-57-4.mol

  • Chemical Properties

    1. Melting Point: N/A
    2. Boiling Point: N/A
    3. Flash Point: N/A
    4. Appearance: /
    5. Density: N/A
    6. Refractive Index: N/A
    7. Storage Temp.: N/A
    8. Solubility: N/A
    9. CAS DataBase Reference: Direct Black 56(CAS DataBase Reference)
    10. NIST Chemistry Reference: Direct Black 56(8003-57-4)
    11. EPA Substance Registry System: Direct Black 56(8003-57-4)

  • Safety Data

    1. Hazard Codes: N/A
    2. Statements: N/A
    3. Safety Statements: N/A
    4. WGK Germany:
    5. RTECS:
    6. HazardClass: N/A
    7. PackingGroup: N/A
    8. Hazardous Substances Data: 8003-57-4(Hazardous Substances Data)

8003-57-4 Usage

Uses

Used in Textile Industry:
Direct Black 56 is used as a dye for cellulose fiber materials such as cotton, linen, silk, and cellulose fiber fabrics. It provides good dyeing properties and has the highest affinity at a temperature of 80°C. The dye is also known for its good discharge properties and is resistant to sensitivity.
Used in Leather and Paper Industry:
Direct Black 56 is also used for dyeing leather and paper products.
Standard:
The standard for Direct Black 56 includes the following properties:
Acid Resistance: ISO 3, AATCC 3
Alkali Resistance: ISO 4, AATCC 5
Light Fastness: ISO 4-5, AATCC 5-6
Soaping: ISO 3, AATCC 4
Water: Fading Stain ISO 2, AATCC 4
SDC Classification: Class B
Neutral and Alkaline White: 5 levels

Preparation

aniline diazo, and 5-Aminonaphthalene-2-sulfonic acid and 8-Aminonaphthalene-2-sulfonic acid coupling, again diazo, and 5-Aminonaphthalene-2-sulfonic acid and 8-Aminonaphthalene-2-sulfonic acid coupling, product to diazo, in alkaline conditions and 6-Amino-4-hydroxynaphthalene-2-sulfonic acid? coupling.

Standard

Acid Resistance

Fading

Stain

ISO

3

AATCC

3

Check Digit Verification of cas no

The CAS Registry Mumber 8003-57-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 8,0,0 and 3 respectively; the second part has 2 digits, 5 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 8003-57:
(6*8)+(5*0)+(4*0)+(3*3)+(2*5)+(1*7)=74
74 % 10 = 4
So 8003-57-4 is a valid CAS Registry Number.

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