Direct Black 103, also known as C.I. Direct Black 103, is a synthetic azo dye primarily used in the textile industry for dyeing cotton, wool, silk, and nylon. It is characterized by its high color strength, good light fastness, and excellent wet fastness properties. The chemical structure of Direct Black 103 consists of a diazo component (2-naphthol-6,8-disulfonic acid) and a coupling component (3-hydroxy-4-((4-nitrophenyl)azo)naphthalene-2,7-disulfonic acid). Due to its potential environmental and health concerns, its use is regulated in some regions, and alternative eco-friendly dyes are being developed.

3071-71-4

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Basic information
1. Product Name: Direct Black 103
2. Synonyms: C.I.Direct Black 103;Diazol Light Grey 4B;1, 5-Naphthalenedisulfonic acid, 3-[[4-[[4-[(7-amino-1-hydroxy-3-sulfo-2-naphthalenyl)-azo]-6-sulfo-1-naphthalenyl]azo]-1-naphthalenyl]azo], tetrasodium salt;Direct Fast Black 2B;Direct Fast Grey L;Direct Grey Light Fast;Vopsider Grey DL.;3-[[4-[[4-[(7-Amino-1-hydroxy-3-sodiosulfo-2-naphthalenyl)azo]-6-sodiosulfo-1-naphthalenyl]azo]-1-naphthalenyl]azo]naphthalene-1,5-disulfonic acid disodium salt
3. CAS NO:3071-71-4
4. Molecular Formula: C40H23N7Na4O13S4
5. Molecular Weight: 1029.8688
6. EINECS: N/A
7. Product Categories: N/A
8. Mol File: 3071-71-4.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 103(CAS DataBase Reference)
10. NIST Chemistry Reference: Direct Black 103(3071-71-4)
11. EPA Substance Registry System: Direct Black 103(3071-71-4)
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: 3071-71-4(Hazardous Substances Data)

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Check Digit Verification of cas no

The CAS Registry Mumber 3071-71-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 3,0,7 and 1 respectively; the second part has 2 digits, 7 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 3071-71:
(6*3)+(5*0)+(4*7)+(3*1)+(2*7)+(1*1)=64
64 % 10 = 4
So 3071-71-4 is a valid CAS Registry Number.

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