Opti-Seal Tear-off Sealing Sheet. Bag of 100 sheets, Opti-Seal Optical Sealing Sheet, with perforationOpti Seal Tear Off Sealing Sheet Opti Seal Optical Sealing Sheet, with perforation Bag of 100 sheets Opti Seal Provides the best sealing option for EU plates and strips. The EU Opti Seal is non pierceable and can be easily removed after the (q)PCR reaction is performed. Perforation is at each 8 strip position and so 8 or a multiple of 8 strips (e. g. 32 ) can be Teared Off. Pressure applied by the heated lid of the thermal cycler, is needed to keep