FIREPLACE MORTAR BLACK 10.3OZ

High temperature resistant silicate mortar for repairing cracked and chipped firebrick and repointing mortar joints in a firebox. When air dried and heat cured, it becomes as hard and strong as firebrick. Use it to tuckpoint between firebricks and repair broken firebricks where the cracks are 1/8" or less. Can be layerd for deeper cracks. Covers approximately 99 linear feet with a 1/8" bead. Meets ASTM E136-79. Withstands temperatures up to 2000-degree fahrenheit. Requires heat to cure. For interior use only.