Age and Weather Resistant Butyl Rubber Formula 100% Solids Content Used as an Exterior Primary Spacing and Glazing Seal Designed to Compress 10% between Two Surfaces CRL Butyl Architectural Tape is an extruded, preformed architectural glazing tape furnished on release paper rolls. Based on a butyl rubber formulation with proven age and weather resistant properties, it is designed to create a long lasting, flexible weather seal between two surfaces which will be subjected to normal expansion/contraction and wind loading forces. It is used as an exterior primary spacing and glazing seal when glazing glass into a window sash; also used to seal other architectural surfaces such as metal to metal joints, wood to glass, metal to plastic, etc. The thickness is designed to be compressed approximately 10 percent at installation to accommodate surface alignments. Color: Gray Thickness of Tape: 1/4 in (6 mm) Width of Tape: 1 /2 in (13 mm) Feet per Roll: 20 ft (6 m) Minimum Order: 1 Case - 20 Rolls Additional Product Information: GOOD GLAZING PRACTICES: The following "Good Glazing Practices" are recommended when using CRL Glazing Tapes. Surfaces to be adhered should be free of frost or standing water, brushed clean, solvent washed (MEK, Toluene or Naptha) and wiped dry. At installation, positive contact and approximately 10 percent compression is recommended to fully marry surfaces to be joined. Glazing tapes kept under compression with clips or wedges provide the best seals. Always use setting blocks (80 durometer Shore "A" hardness) placed at the sill quarter points. Spacing shims are recommended to accommodate wind loading when glass lite is over 100 united inches (50 durometer Shore "A" hardness). Tape placement on the sill rabbet is not to be below the sight line unless a cap bead is specified, then tape is placed 3/16 inch (4.76 millimeters) below the sight line to