Overview
Refractory mortar is a heat-resistant binding material composed primarily of alumina and silica, often with clay additives. It serves as the 'glue' for refractory bricks in high-temperature environments, maintaining structural integrity under thermal stress. Unlike conventional mortars, refractory formulations withstand continuous exposure to temperatures exceeding 1,000°C. Industrial grades are classified by their maximum service temperature (1,300°C to 1,800°C) and chemical composition (acidic, basic, or neutral resistance).
Physical and Chemical Properties
The material exhibits low thermal conductivity (0.5-1.5 W/m·K) and controlled porosity to accommodate thermal expansion. Its bonding strength typically ranges from 3-10 MPa after curing. Chemically, refractory mortar demonstrates stability against slags and flue gases. Acid-resistant varieties contain ≥40% alumina, while basic types incorporate magnesia. Air-setting and heat-setting formulations are available, with the latter developing maximum strength only after firing.
Main Applications
Primary uses include constructing blast furnaces, coke ovens, and glass melting tanks. It seals joints in boiler fireboxes and incinerators, preventing heat leakage and gas penetration. Specialty applications involve bonding ceramic fiber modules and repairing kiln car furniture. In metallurgy, phosphate-bonded mortars withstand thermal cycling in steel ladles. Consumer-grade versions are used for residential wood-burning stoves and pizza ovens.
Safety and Storage
Unhydrated powder requires protection from moisture absorption, which can cause premature setting. Store in original packaging on pallets, away from corrosive chemicals. During application, ensure adequate ventilation to avoid silica dust inhalation. Cured mortar poses minimal hazard unless ground or drilled dry. Disposal follows local regulations for ceramic waste materials.
B2B Procurement Guide
Industrial buyers should specify: 1) Maximum service temperature 2) Required bond strength 3) Chemical environment 4) Application method (troweling, gunning, or brushing). Bulk shipments (1-ton bags) offer 20-30% cost savings over packaged goods. Verify supplier certifications for ISO 9001 and material datasheets with third-party test reports. Just-in-time delivery is recommended for humidity-sensitive products.
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