What kinds of dangerous material is should be avoid from cosmetics

There is approximately 10 chemicals that is dangerous for cosmetics, there are :

-phthalates
-lead
-methenamine
-peg compounds
-butylated compounds
-parabens
-octinoxate
-p-Phenylenediamine
-carbon black
-siloxanes

hope that helps (though you can search it on google for the description of each chemical)