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Kraton polymers are styrenic block copolymer (SBC) consisting of polystyrene blocks and rubber blocks. The rubber blocks consist of polybutadiene, polyisoprene, or their hydrogenated equivalents. The tri-block with polystyrene blocks at both extremities linked together by a rubber block is the most important polymer structure observed in SBC.
In 2013, the company transformed into a strategic holding company and changed its name to what it is today, [8] and separated its cement production business to PT Semen Gresik. In 2019, through Semen Indonesia Industri Bangunan, the company acquired 80.64% of PT Holcim Indonesia Tbk shares owned by Holderfin B.V. and then changed the name from ...
The design of a plain bearing depends on the type of motion the bearing must provide. The three types of motions possible are: Journal (friction, radial or rotary) bearing: This is the most common type of plain bearing; it is simply a shaft rotating in a hole. [3]