The rubber
content was shown to be 14% (w/v) of the E. characias
latex, a low content compared with that of Hevea
brasiliensis (30–35%) but a similar content to other rubber
producing plants. E. characias rubber showed a molecular
weight of 93,000 with a Mw/Mn of 2.9. 1H NMR, 13C
NMR, and FTIR analysis revealed the characteristic of the
cis-1,4-polyisoprene typical of natural rubber.