When sourcing a 1600-grade blanket, the most critical factor is the Alumina (Al2O3) content, which should typically be above 72% to 95% (Polycrystalline Fiber) to withstand continuous temperatures up to 1500°C-1600°C. You must also verify the bulk density, usually ranging from 96kg/m³ to 160kg/m³, as higher density provides better thermal insulation and structural integrity. Additionally, check for low thermal conductivity (measured at 1000°C) and low heat storage to ensure energy efficiency in high-heat environments.