Hello Jungsik, I've done TGA analysis on SU8-2100 (~75%SU8, ~25%Solvent). I got between 20-25% mass left over under nitrogen atmosphere. There are several mixes of SU8 which differs only in their solvent content. You can go to www.microchem.com where you can find composition of the different mixes of SU8. Hope this helps. Christian. -- Christian Antonio Industrial Research Institute Swinburne (IRIS) 533-545 Burwood Road, Hawthorn, VIC., Australia 3122. Tel : +61 3 9214 5698 Fax : +61 3 9214 5050