This thesis contains the results of a study regarding increasing the penetration strength of Kraft Paper Impregnated with a Mixture of Diala B Oil and Soybean Oil as an alternative mixture to reduce the use of transformer oil. To obtain the best mixture composition of transformer oil and soybean oil, samples were prepared with compositions in percentages of 80:20, 70:30, 60:40 and 50:50 for kra…