The selection The two indices are plotted on the σf − E chart in Figure 6.16,
isolating elastomers, foams, and cork. The candidates are listed in Table 6.16
with comments. The value of M2 = 100 MPa admits all elastomers as candidates.
If M2 is reduced to 10 MPa, all but the most compliant elastomers are
eliminated, and foamed polymers become the best bet.