... wafer,precise instrument,semiconductor/SMT/PCB,optical products.. Clean room Wiper Features 1. Superb absorbency, excellent cleaning ... 18M Ohms ultra-pure water, packaged in class 10 clean room 6. Very delicate texture, super soft, cleaning ... medical facilities, laboratory 5) Ideal for using in class 100 cleanroom, etc. Specification MaterialBasic weightSizeThicknessAbsorbencySheets/bags70% polyester ...