In the present report, effect of different type of clay on water barrier properties of starch composite has been investigated. The starch was from cassava, and the clays of 23 % (w/w) were cloisite Na, cloisite 15A, nanofil 116 and PGV. Clay and starch composites were prepared by using solution casting by mixture at 80 °C, stirred for 60 minutes, then put in the oven for 12 hours at 40 °C. The films were characterized by payne cup analysisis (water vapour transmission rate -WVTR), X-ray

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... ion (XRD) and Fourier Transform Infra Red (FTIR). The WVTR values showed that the best water barrier properties improvement of the composites when Cloisite-Na was added to starch. The XRD showed that intercalated nanocomposites were formed in the Cloisite-Na/starch, while microcomposites were formed when Cloisite 15A, PGV, and Nanofill clay were added to starch. Strong interaction between starch and Cloisite was also shown by FTIR.