. From the experimental result, the required drying time for reducing moisture content of sample to desire level depended on drying temperature and air velocity; the drying time decreased with increasing the drying temperature and air velocity. At the final moisture content, the colors of all dried USS by hot air were not darker brown than the dried reference USS by sun drying and regarded good quality color, confirming by the experimental result of WI. In the range of drying condition study, the raw para rubber sheet should be dried by hot air at the drying temperature of 70◦C and air velocity of 0.7 m/s. At the mentioned drying condition, the energy consumption was the lowest.