2024. THE EFFECT OF RECYCLED POLYPROPYLENE AND CALCIUM CARBONATE ADDITION ON MECHANICAL PROPERTIES OF POLYPROPYLENE YARN. Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit . 23, 1 (Dec. 2024), 126–134. DOI:https://doi.org/10.58533/2a68ex49.