This is some information about ChemLab Mod 1.7.2 that you need to know before installing

ChemLab Mod 1.7.2

ChemLab is a Minecraft mod targeted to increase SMP experience by overhauling and adding mechanic to create different types of survival activities for players. This mod is not recommended for SSP until you want heavy challenge to be on your way: at least more than one player is advised. ...

View more and Download here : List of minecraft mods 1.7.2/1.6.4