Synthesis of SAPO-n polycrystalline films were studied to get a better und erstanding of c-4ry1s taplo lygcrryoswtathll inep rocefsilsm s ofw eSrAe POo-bnt aine(dT abloen t1h)e. TIetf l wona s slfaobusn. d tAhbato ut S A1P0O, ---5-2, 0%- 1o1f, t-h1e7, s-t3ar4t ina gn d hydrogels was converted to the films. The large differences in the surface morpholog y and tfhile surface Si concentration were observed between the Teflon and the solution sides of the ms obtained. The Teflon side of the films was formed of an aggregate of cr small crystal size as compared with the solution side (Fig.1). The Si/AI ratio ofy stathlse wsoiltuhtion side was larger than that of the Teflon side (Table 2). From these results, it was concluded that during the initial crystallization of SAPO -n the SAPO -n crystals with the lower Si concentration, A1P0-n, are preferentially crystallized on the Teflon slab.