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       Polyester is the paste with high mechanical resistance, good bending to aggregate and proper strength to heat cycles and chemicals,  polyester with peroxide as hardener and Cobalt as an accelerator The role of hardener is connectivity of monomer molecules and forming a high chain of the polymer Polyester memiliki sifat encer dan fluiditasnya baik sehingga dapat diaplikasikan mulai dari proses hand lay up yang sederhana sampai dengan proses yang kompleks. Banyaknya penggunaan resin ini  didasarkan pada pertimbangan harga yang murah, curing yang cepat, warna yang jernih, dan mudah penanganannya. Hardener Methyl Ethyl Ketone Peroxide, Bahan hardener merupakan bahan yang memungkinkan terjadinya proses curing . Hardener ini terdiri dari dua bahan, yaitu katalisator dan accelerator  . Katalisator dan accelerator akan menimbulkan panas, dimana pengaruh panas ini diperlukan untuk mempercepat proses pengeringan sehingga bahan menjadi kuat. Namun apabila panasnya terlalu tinggi maka akan merusak ikatan-ikatan antar molekul dan juga akan merusak seratnya    The development of biocomposites based on natural fi llers in combination with synthetic thermoplastic polymers has been the subject of considerable recent research efforts (Bajer et al., 2012; Kozio ł et al., 2013). Natural fi ber, owing to its reproducibility, availability, and relatively low price, has become a key raw material for the production of biocomposites. In recent years, natural fi ber reinforced composites have received much attention because of their lightweight, nonabrasive, combustible, nontoxic, low cost and biodegradable properties (Kalia et al., 2009). BASF conducted an eco-ef  fi ciency analysis comparing the production of polymer granules for four petroleum-based polymers to that of two renewable-resourcebased polymers: two petroleum-based polyamides, two petroleum-based polyesters, a biopolymer based on both petroleum and renewable resources and a biopolymer based completely on renewable resources. The obtained results demonstrate that one should not assume that renewable-resource-based polymers are more eco-ef  fi cient. The petroleum-based polyester was the most eco-ef  fi cient, based on its low cost, and had less overall environmental impact than the biopolymers (Wall-Markowski et al., 2004; Golak et al., 2011).  

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