Sustainabilty Of Natural Rubber in SEK of PT Bukit Angkasa Makmur Bengkulu Indonesia The quality of the smallholder rubber processing material (bokar) produced by rubber farmers/planters will determine the selling price. Good bokar quality will guarantee market demand in the long run as reflected by dry rubber content (KKK) and cleanliness level. Improving the quality of natural rubber at the rubber farmer level is mostly done by making rubber processing materials in the form of slabs and lum using coagulants which can damage the quality of rubber such as para vinegar (sulfuric acid), alum (aluminum sulfate) and TSP fertilizer ( Triple Super Phosphate). Besides causing damage to the quality of rubber, the use of coagulants produces a foul odor which is very disturbing to the people around the farmers who process their latex products. The type of coagulant has a major influence on the quality of the bokar, for this reason it is necessary to use the coagulant as recommended. Good garden