The 1/4" material is the most common Grid Gasket product. Because this material does not have an adhesive, it can be used flat or on its side. Interchangeable dimensions. As a result, this material is often used as the ideal width when slotting into 1/4" wide channels. We slit the material to a variety of widths. The gasketing should stand 1/16" tall above the table when in the channel. The Medium Density (U MG) is the most commonly ordered.