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All Journal Manufaktur: Publikasi Sub Rumpun Ilmu Keteknikan Industri
Rajendra Vian Pradiksa
Universitas Negeri Semarang
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering

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Effect of Coir Fiber and Rice Husk Ash on Mechanical and Burning-Rate Properties of Recycled HDPE Composites Rajendra Vian Pradiksa; Kaleb Priyanto; Kriswanto Kriswanto; Khoirul Huda; Martinus Heru Palmiyanto; Bambang Hari Priyambodo; Roy Aries Permana Tarigan; Deslana Avinda Krisna Putra
Manufaktur: Publikasi Sub Rumpun Ilmu Keteknikan Industri Vol. 4 No. 2 (2026): Manufaktur : Publikasi Sub Rumpun Ilmu
Publisher : Asosiasi Riset Ilmu Teknik Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/manufaktur.v4i2.1526

Abstract

Recycled high-density polyethylene (rHDPE) offers a sustainable alternative to virgin plastics, but repeated processing can degrade its mechanical properties, motivating reinforcement with natural fibers and fillers. This study investigated the combined effect of coir fiber and rice husk ash (RHA) on the mechanical and burning-rate characteristics of rHDPE composites using a two-stage experimental design. In Stage 1, coir fiber content (5, 10, and 15 vol.%) was varied to determine the optimum reinforcement level based on impact strength. In Stage 2, the selected optimum fiber content was combined with RHA (5 and 10 vol.%) to evaluate tensile strength and burning behavior, tested according to ASTM D638, ISO 179, and ASTM D635, respectively. Results showed that 10 vol.% coir fiber produced the highest impact strength (16.36 kJ/m²), while higher fiber loading reduced toughness due to agglomeration and void formation. The composite with 5 vol.% RHA exhibited superior tensile strength (10.46 ± 1.23 MPa), whereas 10 vol.% RHA improved ignition resistance, extending ignition time to 14 s. These findings demonstrate that alkali-treated coir fiber and RHA can enhance rHDPE performance, supporting the valorization of plastic and agricultural waste into sustainable composite materials.
Co-Authors Bambang Hari Priyambodo Deslana Avinda Krisna Putra Khoirul Huda Kriswanto Kriswanto Martinus Heru Palmiyanto Priyanto, Kaleb Roy Aries Permana Tarigan