Blends of nitrile butadiene rubber/poly (vinyl chloride): The use of maleated anhydride castor oil based plasticizer - Dewi, Indiah Ratna; Center for Leather, Rubber, and Plastic, Jl. Sokonandi No. 9 Yogyakarta, Indonesia (Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia, 2016)