Limestone in "Happiness Factory" is a very important basic ore in the game, and it can be used to produce many materials and props, such as the most basic concrete, fine concrete, rubber concrete, and plastic concrete. The required facilities are construction station, assembly station and refining station.
What are the uses of limestone in Xingfu Factory
The recipes for making limestone are as follows
Click on the image to see a larger version
Concrete requires technology T0 hub upgrade 3
Fine concrete requires technology "Molecular Analyzer Quartz-Silicon T2 Parts Assembly"
Rubber concrete requires technology T5 petroleum processing
Plastic concrete requires technology "T3 coal power T5 petroleum processing"