Study of Raw Natural Rubber from New Rubber Tree Clones (IAC Series)

The technological properties of raw natural rubber (NR) from new rubber tree clones of IAC series (40, 56, 300-303) and RRIM 600 (asiatic reference clone) were evaluated by: acetone extract (%), Wallace plasticity (P-0), plasticity retention index PRI (%) and Mooney viscosity (V-R). There were significant variations (P < 0.01) between clones and tappings for all technological properties, except for the PRI (%) among clones (non significant). NR from IAC 301 and 303 clones indicated acetone extract average values (%) above the maximum limit of 3.5 % of the standards ABNT/NBR 11597. P-0 and V-R results indicate high average values. These two properties showed to be highly correlated (r = 0.96). PRI (%) from IAC clones follow the specifications of the standards ABNT/NBR 11597 (60 % minimum) and are superior to the RRIM 600, except for clone IAC 56.