Dear all: I would like to know the data of PMMA in vacuum. Our operator insisted that PMMA can be outgased in metal(Au) sputtering system. Then the chamber wall would be contaminated. But PMMA can be used in E-beam lithography in UHV. Could you please give me any data about it or tell me your experiences between vacuum and PMMA in sputtering system? Thanks in advance. Sungjun Lee / Graduate student. ------------------------------------------------------------- Mr. Sungjun Lee Center for Science in Nanometer Scale, Inter-University Semiconductor Research Center, Seoul National University, Seoul, 151-742, South Korea Mobile:+82-16-2264658 Fax:+82-2-8748926 Mail:poyntor@yahoo.com -------------------------------------------------------------