Surface free energy and friction coefficient on the bloom film of aliphatamide before and after blooming have been investigated for NBR vulcanizates prepared with two different molds. Teflon sheet (TP) mold gave an initial bloom film with lower surface free energy on NBR vulcanizates before blooming than ferrite plate (FP) mold. Initial bloom films with high surface free energy, which were prepared by FP mold, changed to those with low surface free energy on explosure at 70°C in air. This suggests that in the aliphatarmide molecules of top surface layer on bloom films, the returning of amide groups into inner and alkyl groups to top surface occured. Friction coefficiency of bloom films of NBR vulcanizates was influenced by the surface free energy of molds and bloom films. It decreased with stearamide weight in NBR vulcanizates and with bloom time. In general, the friction coefficiency of bloom films with even number for the carbon numbers of aliphatamide was higher than that with odd numbers.