[charzhino]

Cant seem to get my head around it. According to a paper I should use 0.18% (relative to methacrylic acid) of initiator for the following polymerisation.

Methacrylic acid -----> Poly methacrylic acid
                               

The amount of MMA used is always 20g, so 0.18% of this is 0.036g. However this is only for 75% purity form of the Vazo 68 (initiator). I am using 99% purity, so if I want to keep the 0.18% form correct how much of the 99% should I use?

Is it 0.027g since the active material is only this much in a 75% version and if using a 99% I wouldn't need to worry about impurities?