Optimization of Bentonite Bar Soap Formula with Combination of Coconut Oil and Soybean Oil Using Simplex Lattice Design Method

Muslim population in Indonesia reaches 87% and is one of the countries with largest muslim according to 2010 census. Thaharah things that Muslims pay much attention to, especially worship. One thaharah washing up from najis mughallazah. Soap skin cleansing preparations has become a public basic needs so innovation soap formulation containing bentonite as component can washed mughallazah make it easier for thaharah. This study optimizes formula bar combination coconut oil soybean using Simplex Lattice Design method. The optimum obtained was then verified sample T-test To determine formula, necessary test physical chemical properties such foaming power foam stability follows parameters Standar Nasional water content, pH, total fat, insoluble substance ethanol, free alkali/ fatty acid unsaponifiable fat. Bentonite tested consumer acceptance. prediction consisted 76.58% 23.42% oil. results produced hard good met several requirements SNI 3532:2021.