I am not an expert and what i am going to say is from reading,
correct me,please,if something wrong or not accurate.
I read that the smaller carbonhydrogen compounds like the aromatic
are the ones which penetrates the rubber and caused it to swell.
So,if the factory removes those aromatic compound from the mineral spirit,in order to make it odorless,i assumed that it won't swell the rubber(or swell it less)as the aromatic compound was removed.
Where am i wrong?