Benzenesulfonic acid, 4-hydroxy-, polymer with formaldehyde, phenol and urea is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.
The CAS Registry Mumber 102561-67-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,2,5,6 and 1 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 102561-67: (8*1)+(7*0)+(6*2)+(5*5)+(4*6)+(3*1)+(2*6)+(1*7)=91 91 % 10 = 1 So 102561-67-1 is a valid CAS Registry Number.
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