Hydrophilic film
Hydrophilic films allow for fluid transport along the test strip in the desired direction. It provides a consistent thickness and flow of the test sample.
3M 9971 3.88 mil, optically clear film with hydrophilic treatment on one side
3M 9960 7 mil optically clear film with hydrophilic treatment on both sides
3M 9962 4 mil optically clear film with hydrophilic treatment on both sides
