ISO Certificated Fire Resistant Micro-Holes Aluminium Honeycomb Core Sheet. A1 Fireproof Rating: Certified fire-resistant material with A1 flammability classification for building safety. High Strength-to-Weight: Excellent specific strength and rigidity ratio, offering lightweight durability. Customizable Dimensions: Customized sizes accepted for length, width, and height to meet project needs. Anti-Corrosion Performance: Aeronautic grade aluminum alloy provides excellent anti-corrosion properties. ISO Certified Quality: Manufactured with ISO certification ensuring high quality and reliability. Multiple Core Types: Available in expanded, unexpanded, perforated, and full block honeycomb cores. 10 Years Experience: Over a decade of manufacturing experience with professional technical support.