The 1/4" material is the size that we most often use when making Grid Gasketing products. 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.