6420-03-7 Usage
Uses
Used in Textile Industry:
C.I. Direct Orange 31 is used as a dye for cellulose fibers in the textile industry due to its good levelness and whiteness retention.
Standard:
C.I. Direct Orange 31 has a standard rating of 4 for acid resistance, 3-4 for alkali resistance, 3 for light fastness, 2-3 for soaping, and 3 for water fading.
ISO:
The ISO rating for C.I. Direct Orange 31 is 4 for stain fading.
Preparation
3,3′-Dimethylbenzidine?double nitriding, respectively with?2-Hydroxybenzoic acid and 4-(3-Methyl-5-oxo-4,5-dihydropyrazol-1-yl)benzenesulfonic acid coupling.
Standard
Acid Resistance
Fading
Stain
ISO
4
Check Digit Verification of cas no
The CAS Registry Mumber 6420-03-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 6,4,2 and 0 respectively; the second part has 2 digits, 0 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 6420-03:
(6*6)+(5*4)+(4*2)+(3*0)+(2*0)+(1*3)=67
67 % 10 = 7
So 6420-03-7 is a valid CAS Registry Number.
