Sulphon Black R, also known as C.I. Sulphur Black 1, is a synthetic organic dye belonging to the azo class, characterized by its dark black color. It is widely used in the textile industry for dyeing cotton, wool, silk, and nylon fibers, as well as in the production of printing inks and pigments. Sulphon Black R is known for its excellent light fastness, high tinctorial strength, and good solubility in water, making it a popular choice for various applications. However, it is important to note that, like many dyes, it may have environmental and health concerns, and proper handling and disposal are necessary to minimize potential risks.

6399-91-3

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Basic information
1. Product Name: Sulphon Black R
2. Synonyms: Sulphon Black R;5-[[4-[(4-Aminophenyl)azo]-1-naphthalenyl]azo]-6-hydroxynaphthalene-2-sulfonic acid sodium salt;C.I.27065;C.I.Acid Black 20
3. CAS NO:6399-91-3
4. Molecular Formula: C26H19 N5 O4 S . Na
5. Molecular Weight: 0
6. EINECS: N/A
7. Product Categories: N/A
8. Mol File: 6399-91-3.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: Sulphon Black R(CAS DataBase Reference)
10. NIST Chemistry Reference: Sulphon Black R(6399-91-3)
11. EPA Substance Registry System: Sulphon Black R(6399-91-3)
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: 6399-91-3(Hazardous Substances Data)

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Check Digit Verification of cas no

The CAS Registry Mumber 6399-91-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,3,9 and 9 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 6399-91:
(6*6)+(5*3)+(4*9)+(3*9)+(2*9)+(1*1)=133
133 % 10 = 3
So 6399-91-3 is a valid CAS Registry Number.

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