The effect of non-oiled sulfur concentration on the adhesion between nitrile rubber (NBR) and dipped or undipped Nylon 6,6 cords is discussed. The results show that using undipped cords with NBR (grade 34/50) enhance adhesion. In this article, the crosslink, density of different nitrile rubber mixes were estimated to illustrate their effect on adhesion. The resistance to heat aging and ionizing radiation were also studied.