| Abstrakt: |
This study covers characterization of nine Rubber Research Institute of Malaysia (RRIM) clones. Among these, RRIM 3001, 2023, 2025, 2020 and 2015 showed above average dry rubber content (DRC > 40%) while RRIM 928, 2024, 2017 and 2007 gave DRC < 40% (average and below). No clone was below average (DRC < 31%) which is not suitable for commercial use. Viscosity of RRIM 2023 and 2025 was unusually lower than the rest; however, this did not affect dipping or causing any adverse effect in the physical properties of their respective dipped films. Except for RRIM 928, the minimum mechanical stability time (MST) requirement (650 s) was achieved by 3rd week for all clones. All dipped films prepared from the ammoniated latex concentrates of RRIM clones recorded mechanical properties within the acceptable range of standard requirements for rubber glove applications, with tensile strengths higher than 18 MPa, force-at-break greater than 12 N, stress at 500% elongation much lesser than 5.5 MPa, tear strength ranged 13–28 N/mm, elongation-at-break values above 650%, regardless unaged and aged treatments or subjected to natural ageing. Overall, the extractable protein (EP) contents of dipped films prepared from ammoniated latex concentrates for all clones have recorded much lower than 100 µg/g. The innate proteins in all clones were majority smaller than 95 kDa. All RRIM clones had passed the cytotoxicity test (with grade 2 and below) when tested at two-fold dilution. All results suggested the tested RRIM clones are suitable for dipped film applications. |
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