Cleanroom paper is used for writing, printing and photocopying in cleanroom environments.. Dual Binding Technology Brightness %: 88-92 Suitable for use in class 10 to Class 1000 (ISO class 4 to Class 6) cleanroom Pure image Premier Paper produced in Class 10 (ISO 4) cleanroom Excellent printability and heat toner adhesion Double sided web cleared prior to sheeting High opacity and durability USP <797>