The pre-vulcanized SSNRL compound was prepared according to formulation in Table 3 in a reaction flask at 70
°C. A chloroform number test was used to determine the degree of pre-vulcanization of the compound. The prevulcanization
was stopped at chloroform number 3. The compound then was allowed to cool and mature for 24
hours under room temperature. SSNRL films were prepared by coagulant dipping (10% calcium nitrate). Cleaned
and dried aluminum plates were dipped in coagulant tank for 10s followed by drying at 100 °C in an oven for 15
minutes. The dried former then dipped in latex tank for 10s. Then, the aluminum plates were withdrawn and dried in
the oven at 100 °C for 30 minutes. The dried SSNRL films were stripped from the aluminum plates and placed in
the desiccators before further tests.