The critical functionality of component A 𝑓 𝑎 ̅ could be calculated by Eq. ( ). If the average functionality maintains at a constant value 𝑓 𝑏 ̅ , there will be a definite 𝑓 𝑎 ̅ . An example of the quantitative relations is shown in Table : It means that when the raw material monomer with an appropriate functionality is employed, the number average of final branching points will be a constant value and the gelation never occurs.