Recently I researched "Slag use" (red, green, blue science packs), which enables the receipe "Slag Partial Cracking". I was a bit surprised that this receipe could only be used in the Integrated Chemical Plant which also requires purple and yellow science packs for being researched.
I don't know if Slag Partial Cracking is supposed to be a late game technology or if the receipe is simply in the wrong category. I changed it in my copy of the mod but it feels a bit cheaty :/

Other little bug: Advanced Cast Iron Making does not activate "forgin-iron-c" but "forging-iron-b" which is already activated by an earlier technology.

I really love this mod and am looking forward to playing it through. Thanks for your work and for making me interested in chemistry!