First off, want to say thanks for making this mod. I have enjoyed it a lot so far. On to the suggestion...

I'm a bit underwhelmed by the two productivity techs in this mod, "Heavy glass productivity" and "Quartz productivity". I don't feel like either heavy glass or quartz are used in enough recipes to warrant productivity techs for them. Maybe there isn't any harm in leaving them as is, but the lack of any productivity techs with much of an impact is a bit disappointing.

I think a "Sifter productivity" tech would be great. The huge amount of sand that is required for sifting means the pipe transfer limits often limit the production of your end game sifters. A tech to compensate with an in-built productivity bonus would help a lot.

P.S. I think it would also be neat if there were some applications for the sifter that would apply to the base game. I'm having a hard time coming up with anything specific, but maybe there is room to improve lithium processing through the sifter?

My original idea was to give arig plastic productivity but i ended up implementing it as a better than vanilla recipe, heavy glass and quartz are prob going to be a lot more necessary in the future updates of planetaris so it will be important. Thanks for the suggestion about the sifter, ill look what other vanilla processes can i add :D

Cool! I'm excited that you have more planned :)