ASTM C892: High-Temperature Fiber Blanket Thermal Insulation
Standard Specification for High-Temperature Fiber Blanket Thermal Insulation
Last updated: September 21, 2025
Overview
ASTM C892 covers insulation blankets made from refractory oxides designed for use in high-temperature environments, from ambient up to 3000°F (1649°C). These materials are distinct from conventional mineral wool and are used in industrial applications and specialized building assemblies where extreme heat resistance is required.
Performance Requirements
- Maximum use temperatures ranging from 1800°F to 3000°F by grade
- Minimal linear shrinkage at maximum temperature for 24 hours
- Minimum tensile strength for handling and installation
- Limited non-fibrous content (shot) to maintain thermal performance
Building Fire Protection Applications
While primarily an industrial standard for furnace and kiln linings, ASTM C892 materials have critical building applications for specialized fire-protection scenarios:
- Grease duct enclosures in commercial kitchens (code-required fire rating)
- Life-safety ventilation duct protection
- Critical electrical conduit fire-rated enclosures
- Flexible fire-rated duct wrap systems (2-hour ratings)
Value-Engineered Solutions
Traditional grease duct fire protection uses multi-layer gypsum board shafts - labor-intensive and space-consuming. Alternative flexible fire-rated duct wrap systems use high-temperature insulation blankets (ASTM C892 compliant) encapsulated in foil, wrapped directly around ducts. This provides required 2-hour fire ratings in smaller footprints, saving space and reducing installation time and cost. Require valid third-party listings (e.g., UL design numbers) and ASTM C892 compliance for the insulation component.
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