Dap Inc 18854 High Heat Mortar Sealant 10 Oz Silicate Cement

Product Description

The DAP INC 18854 is a high-heat mortar sealant formulated as a non-combustible silicate cement for use in wood frame construction where an ASTM E 136 compliant sealant is required. This 10 oz cartridge delivers a refractory-grade seal that withstands temperatures up to 2,000 degrees F, making it suitable for high-temperature sealing and patching applications. It sets rock hard when fired, providing a durable, long-term bond around heat-producing appliances. Water cleanup keeps the job site manageable during application. Licensed contractors and fireplace installers working on residential heating appliances will find this a code-appropriate choice where non-combustible sealing is mandated.

This mortar sealant is designed for patching and sealing around fireplaces and wood burning stoves installed in wood frame construction. It is suited for residential applications where building codes or inspection requirements call for an ASTM E 136 non-combustible sealant at penetrations, joints, or gaps near high-heat appliances. The silicate cement formulation bonds well to masonry, brick, and metal surfaces commonly found in fireplace and stove installations.

Key Features

• Withstands temperatures up to 2,000 degrees F for use near fireplaces and wood burning stoves
• Non-combustible silicate cement formulation meets ASTM E 136 requirements
• Sets rock hard when fired for a durable, long-lasting seal
• Suitable for patching and sealing gaps, joints, and penetrations around high-heat appliances
• Water cleanup simplifies application and tool maintenance
• Packaged in a 10 oz cartridge for standard caulk-gun application

Compatibility

Designed for use in wood frame construction applications where an ASTM E 136 non-combustible sealant is required, including patching and sealing around fireplaces and wood burning stoves.

Installation Notes

Installation should be performed by a licensed contractor or qualified tradesperson familiar with fireplace and solid-fuel appliance codes, including applicable NFPA and IRC requirements. Power down or fully extinguish and cool any appliance before applying sealant to surrounding surfaces. Apply using a standard caulk gun and smooth with a wet tool before the product skins over. Allow the product to cure and fire the appliance as directed to fully harden the mortar seal.