Parameter                                  Level 1 Level 2 Level 3 level 4
A. Time (min) 5 7.5 10 17.5
B. Temperature (°C) 80 85 90 95
C. Agitation speed (rpm) 180 350 450 600
D. Coagulant concentration agent (wt %) 1 2 3 4
E. latex to coagulant Volume ratio 3:1 2:1 3:2 1:1
Table 1: Factors and their values corresponding to the levels in the experiments.