Overview
Duct silicate board is an inorganic insulation material composed primarily of magnesium oxide, silica, and reinforcing fibers. Developed as a safer alternative to asbestos-based materials, it meets modern fire safety standards while providing effective thermal insulation. Manufactured through a wet-forming process, the boards achieve uniform density and structural integrity. They are commonly produced in thicknesses ranging from 20mm to 100mm, with standard panel sizes of 1200×600mm or 2400×1200mm for easy installation in HVAC systems.
Physical and Chemical Properties
The material exhibits exceptional fire resistance, withstanding temperatures exceeding 1000°C without melting or releasing toxic fumes. Its closed-cell structure provides thermal conductivity values comparable to mineral wool, typically between 0.045-0.065 W/m·K at room temperature. Chemically inert, the boards resist corrosion from most acids and alkalis encountered in industrial environments. The reinforced fiber matrix gives them a flexural strength of 0.3-0.5 MPa, allowing for some structural applications. Water absorption rates remain below 5% by volume when properly sealed.
Main Applications
Primary use involves insulation for rectangular HVAC ducts in commercial buildings, particularly where fire ratings are required. The boards serve as both insulation and fireproof cladding, often replacing separate insulation layers and fire barriers. In industrial settings, they protect process piping and equipment in petrochemical plants. Secondary applications include fire-rated partitions in buildings and acoustic insulation for mechanical rooms. Some variants with decorative finishes are used as ceiling tiles in fire-sensitive areas.
Safety and Storage
While non-toxic when intact, cutting operations generate silicate dust requiring NIOSH-approved N95 respirators. Installers should use gloves to prevent fiber irritation and eye protection during fabrication. Boards must be stored horizontally on flat surfaces to prevent warping, preferably in climate-controlled warehouses. Although moisture-resistant, prolonged exposure to humidity may affect dimensional stability. Pallets should remain covered with waterproof sheeting during outdoor storage at construction sites.
B2B Procurement Guide
When sourcing duct silicate boards, verify third-party certifications including ASTM E84 for surface burning characteristics and EN 13501-1 Euroclass A1 certification. Request technical datasheets confirming thermal performance values under operational temperature ranges. For large projects, consider manufacturers offering custom sizes to minimize cutting waste. Lead times typically range 2-4 weeks for specialized orders. Bulk purchases (full container loads) often qualify for 8-12% discounts, with FOB prices varying by regional raw material costs.
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