Overview
White slag-stopping wool is a specialized refractory material composed primarily of alumina-silicate fibers. Developed for high-temperature industrial applications, it serves as a physical barrier to separate molten steel from slag during casting operations. The material's unique structure combines thermal insulation properties with mechanical resilience. Manufacturers produce this wool through a spinning or blowing process of melted ceramic oxides, resulting in interlocking fibers that create a lightweight yet stable matrix. Its white coloration typically indicates higher purity compared to standard slag wool variants.
Physical and Chemical Properties
The material exhibits exceptional thermal stability, maintaining structural integrity at continuous operating temperatures up to 1400°C. Its low thermal conductivity (typically 0.1-0.2 W/m·K at 1000°C) makes it effective for heat containment. The fibrous structure provides elasticity and recovery after compression. Chemically, white slag-stopping wool demonstrates resistance to most metallurgical slags and fluxes. The alumina content (usually 45-60%) determines its chemical inertness, with higher alumina grades offering better resistance to basic slags. The material remains stable in both oxidizing and reducing furnace atmospheres.
Main Applications
In steel plants, workers place slag-stopping wool at the pour gate of ladles or tundishes to create a physical barrier that prevents slag carryover during teeming. This application significantly improves steel cleanliness by reducing non-metallic inclusions. The material also finds use in back-up insulation for refractory linings, expansion joint filling, and as a thermal break in continuous casting systems. Some foundries employ it for mold insulation where controlled cooling rates are required for specialty alloys.
Safety and Storage
While ceramic fibers are generally safer than asbestos, proper handling precautions remain essential. The material can release airborne particles during cutting or installation, requiring NIOSH-approved particulate respirators. Facilities should implement wet methods or local exhaust ventilation during processing. For storage, maintain original packaging in dry conditions (relative humidity below 65%) to prevent moisture absorption. Stack bundles no higher than 2 meters to avoid compression damage. Shelf life typically exceeds 12 months when stored properly away from direct sunlight.
B2B Procurement Guide
Industrial buyers should specify fiber diameter (typically 3-5µm), bulk density (80-120kg/m³), and maximum service temperature when ordering. For steelmaking applications, verify the manufacturer's quality certificates for chemical composition consistency. Leading producers include specialized refractory companies in China, Europe, and North America. Consider ordering sample batches to test performance under actual operating conditions. Bulk purchases (pallet quantities or container loads) typically attract 15-30% price discounts compared to small-quantity orders.
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