HPM - Heatproof Mortar

Heatproof Mortar - Ready Mixed Fireplace Mortar

Vitcas Heatproof Mortar is a ready-mixed, air-setting refractory mortar with a smooth, trowelable consistency. It is specifically formulated for high-temperature applications in interior or non-weather-exposed environments, withstanding continuous exposure to temperatures up to 1400°C (2552°F)-well above those encountered in domestic heating systems. Suitable for all types of fire bricks, brick slips, and refractory insulation materials, it is ideal for constructing and repairing fireplaces, wood-burning stoves, indoor pizza ovens, and boiler enclosures. Designed for thin joint application, Vitcas Heatproof Mortar delivers strong, durable bonds and long-lasting thermal reliability in demanding indoor conditions.

A 10kg tub provides coverage for approximately 40 standard fire bricks (230 × 114 × 64 mm) when applied at the recommended joint thickness of 3-5 mm.

Applications of Heatproof Mortar

• Setting fire bricks and insulation materials

• Installing firebricks in room heaters and boilers

• Building and repairing fireplaces

• Lining fireplace recesses with firebricks or brick slips

Use it wherever traditional mortar would be applied-but where heat resistance is essential. Suitable for all interior applications, it must not be used in exterior environments unless fully protected from moisture by a roof or a render coat made from a different, weather-resistant material.

Note: This product is not suitable for rendering or gap-filling. For outdoor or weather-exposed applications, consider Vitcas Heatproof Screed or Vitcas Outdoor Oven Cement as appropriate alternatives.

Application Instructions

• Ensure all surfaces are clean and free from dust, grease, and debris.

• Stir the contents of the tub thoroughly before use.

• Apply using a trowel, making sure all joint surfaces are fully covered with a thin, even layer of mortar.

• Do not mix with other materials.

• Clean all tools with water immediately after use.

• Drying and curing are aided by the application of gentle heat once the installation is complete.