Change to read:
Label it to indicate that it is not intended for internal use.
A carbomer homopolymer manufactured using benzene and complying with the unique requirements of this monograph will be officially titled Carbomer 934 and will not be referred to as Carbomer Homopolymer
Proceed as directed in the test for Viscosity
under Carbomer 934P
. It is between 30,500 and 39,400 centipoises.
Limit of benzene
Proceed as directed in the test for Limit of benzene
under Carbomer 934P,
except to use about 20 mg of Carbomer 934, accurately weighed, instead of about 1 g of Carbomer 934P, to prepare the Test solution
. Calculate the percentage of benzene in the portion of Carbomer 934 taken by the formula:
10(C/W)(rU / rS)
in which C
is the concentration, in µg per mL, of benzene in the Standard solution; W
is the weight, in mg, of Carbomer 934 taken to prepare the Test solution;
are the benzene peak responses obtained from the Test solution
and the Standard solution,
respectively: not more than 0.5% is found.