The regression coefficients from the second order equations for each dependent variable can be observed in Table 3, along with their corresponding p, F (calculated and tabulated) and R2 values. The analysis of variance (ANOVA) at the 95% confidence level implied that tensile strength (TS) presented calculated F values lower than the tabulated values, as well as a low R2 value, meaning that, for the studied range, the model was not able to explain the quadratic data behavior. All other parameters were statistically significant,with high coefficient of determination (Fc > Ft; R2≥ 0.88; p < 0.05).