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Alcolin Fire Stop Fireproof Sealant is a high-quality sealant made from inorganic resins that do not shrink, crack or allow for movement once cured. It bonds to concrete, brick and metal and is ideal for permanently repairing and sealing openings, joints, cracks and fixtures in chimneys, piping, refractory elements and other areas which come into direct contact with flames or are exposed to extremely high temperatures (up to 1500°C).