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48 obtained directly from plants and animals. These fibers have been widely used, including cotton, wool, silk, banana fronds, coconut husk, palm fiber, bamboo, pineapple and, kenaf, or burlap. Natural fibers have a weakness; namely, the size of the fiber is not uniform; the strength of the fiber is greatly influenced by age [3]. The existence of coconut trees in Indonesia is very abundant [4]. Coconut fruit consists of fruit and skin, whereas coconut skin consists of fiber and flesh. Coconut coir fiber contains three main elements, they are cellulose, hemicellulose, and lignin. Lignin is a fiber impurity element, which causes it to be difficult to bond automatically. The coconut coir fibers need to be treated to reduce the lignin content of the fibers and have good quality [5]. Chemical treatment can include central degradation of the fiber, which can result in surface damage, thereby decreasing the mechanical properties of the thread. As a result, there is a need for a treatment that can clean the thread without destructing the cellulose. The characteristics of natural fibers are pretentious by the processing and treatment of textures. Some of the treatments used can comprise chemical treatment or natural treatment with natural substances, and some chemical treatments contain alkali treatment [2, 5, 6].

Effect of coconut fiber treatment with limestone water media on the fiber surface, wettability, and interface shear strength