Design of an ergonomic lounge chair using water hyacinth material after going through a tensile test

In Indonesia, Water Hyacinth (Eichornia crassipes) is a wild plant species that grows in rivers or lakes. This species multiplies, which can cause a significant problem for water transportation. Due to increasing concerns around climate change and environmental sustainability, the construction industry is looking for alternative materials and methods to reduce environmental impact. The "Adjustable Chair" u ses an ergonomic approach to achieve an attractive and comfortable product. This research seeks to positively impact fishermen's job security and the biodiversity in the water bodies' ecosystem and to develop an ergonomic product that uses both traditional and modern minimalist styles in designing the product. Therefore, a product that is both comfortable and attractive can be created. This research aims to utilise wild WH waste on water bodies' surface that threatens water transportation and its ecosystem for designing the adjustable chair through the market research study and ergonomically design with product development selection concept and tensile test. Based on the tensile test that has been carried out, it can be seen from the graph that the tensile test of 3 twisted WH stems has a tensile strength that is much stronger than the tensile test using one WH stem, two WH stems, and three WH stems. The tensile test of 3 twisted WH stems had more muscular strength with a tensile test time of 9 min 38 s with an increase in length of 2.5 mm. So, making an adjustable chair will use twisted WH stems. It can form an adjustable chair, which, if woven with large amounts of WH, the resulting product will be more durable, and the material will be more robust.