Reduces sample-to-sample or well-to-well contamination and/or spill over. Has the differential advantage of perforated end tabs and a multiple split backing which allow for easier and more accurate positioning and more secure sealing. The polyester based film with acrylic adhesive is inert and thus compatible with almost all microplate procedures. The functional temperature range of the product is -70° to +100°C. Less than .001% moisture permeable under high humidity conditions and less than .01% oxygen permeable. DMSO resistant.