Serat kelapa adalah salah satu bahan alam yang serbaguna dengan berbagai aplikasi di berbagai industri. Serat kelapa digunakan dalam pembuatan tali, kain, dan produk tekstil lainnya. Serat ini sering digunakan dalam produksi karung, tikar, dan anyaman. Serat kelapa dapat digunakan sebagai campuran dalam pembuatan beton dan bahan bangunan lainnya. Sabut kelapa dapat juga dimanfaatkan menjadi bahan komposit. Komposit terdiri dari dua unsur yaitu matriks dan filler. Dalam penelitian ini bertujuan untuk mengetahui tahapan dalam pembuatan komposit dengan memanfaatkan sabut kelapa sebagai filler, dan pengaruh sabut kelapa terhadap kekuatan impact dan kekerasan. Komposisi filler yaitu sekitar 10, 15, 20 (%) serat dari sabut kelapa dengan bermatriks resin sekitar 100%. Penambahan filler diiringi pengurangan matriks yang digunakan dari 100% epoxy. Spesimen dengan perlakuan NaOH dibuat dengan 9 spesimen dan tanpa perlakuan dibuat sebanyak 3 spesimen. Komposit dibuat dengan proses hand lay-up. Komposit yang telah dibuat kemudian dilakukan uji mekanik yaitu kekerasan dan impact. Hasil data tertinggi uji kekerasan dengan perlakuan NaOH pada variasi (15%/85%) sebesar 75 shore D. Kekerasan terendah pada variasi (10%/90%) sebesar 63 Shore D. Sedangkan tanpa perlakuan hasil penelitian data tertinggi menunjukkan pada variasi (10%/90%) sebesar 74 Shore D. Dan kekerasan terendah pada variasi (20%/80%) sebesar 63 Shore D. Kekuatan impact perlakuan NaOH tertinggi berada pada variasi 20% energi serap sebesar 3.28 Joule dan ketangguhan impak sebesar 0.020 J/mm². Dan tanpa perlakuan tertinggi berada pada variasi 20% energi serap sebesar 3.39 Joule dan ketangguhan impak sebesar 0.021 J/mm².

Kata Kunci: Epoxy, Komposit, NaOH, Sabut Kalapa, Uji Impact, Ujia Kekerasan

A natural resource with several uses across different sectors is coconut fiber. Rope and other textile items, as well as textiles, are made from coconut fiber. This fiber is frequently used to make webbing, carpets, and sacks. Concrete and other building materials can be made with a combination of coconut fiber and other resources. Additionally, coconut fiber can be employed as a composite material. Two components make up a composite: filler and matrix. The purpose of this study was to identify the steps involved in producing composites with coconut fiber as a filler, as well as how coconut fiber affected the impact of strength and hardness. The filler composition was around 10, 15, 20 (%) fiber from coconut fiber with a resin matrix of around 100%. The addition of filler was accompanied by a reduction in the matrix used from 100% epoxy. 9 specimens were made with NaOH treatment and 3 specimens were made without treatment. Composites were made by hand lay-up process. The composite that had been made was then subjected to mechanical tests, namely hardness and impact. The highest data results for the hardness test with NaOH treatment at variations (15%/85%) were 75 shore D. The lowest hardness at variations (10%/90%) was 63 Shore D. Meanwhile without treatment the highest data research results showed at variations (10 %/90%) is 74 Shore D. And the lowest hardness was at variation (20%/80%) at 63 Shore D. The highest impact strength of NaOH treatment was at 20% variation, absorption energy was 3.28 Joules and impact toughness was 0.020 J/mm². And without treatment the highest was at a 20% variation in absorption energy of 3.39 Joules and impact toughness of 0.021 J/mm². Keywords: Epoxy, Composite, NaOH, Coconut Fiber, Impact Test, Hardness Test