20.5" x 20.5" sheet. Thin shelf paper for fusing. Stands up to full fusing without charring. A heat resistant, lightweight ceramic impregnated paper, which provides an excellent separation between the kiln shelf and the glass in kiln firing applications up to 1600 degrees F. Imparts a fine matte texture to fused glass pieces. Compared to conventional kiln washes, (alumina hydrate/kaolin clay mixes), thinfire reduces shelf preparation time and improves surface release quality.