Pengaruh Kombinasi Komposisi Bahan Olah Karet terhadap Tingkat Konsistensi Plastisitas Retension Indeks (PRI) Karet Remah Sir 20 di PT Bridgestone Sumatera Rubber Estate Dolok Merangir

Abstract

The natural rubber has a preferably physical characteristic that fonded of the tire enterprise as the more exellency than the synthetic rubber. Nowadays the improvement of rubber consumption just lies on the product, the high concistency and uniformity of production. To improve the qualited consistency of SIR 20 productivity required to conduct of combination between raw rubber quality. Facilities to uniform (macroblending) in intensive processing also needed. PT. Bridgestone Sumatera Rubber Estate has conducted comparison of composition raw rubber SIR 20 that is 32% quality 1, 30% quality 2, 28% quality 3 and 10% quality 4. From the observation, we got the value of PRI with up to standard quality of Standard Indonesian Rubber that are about 78,5 and 87,5% for consistency of PRI.