Ceramic fibre in 1950s: Needled blankets · 295

Ceramic fibre (Al2O3–SiO2 (RCF) / alkaline earth silicate (AES)) is a family of grades whose density 64–192 kg/m³ blankets, heat band classification T often 1260–1400 °C, and fire letter A1. Ceramic fibre is sold as grades, not as a single substance. Chemistry Al2O3–SiO2 (RCF) / alkaline earth silicate (AES), density 64–192 kg/m³ blankets, heat band classification T often 1260–1400 °C.

This atlas treats Ceramic fibre as a system: mill route, coatings, tests and the cavity it sits in. Conductivity note: λ rises with T; still far below brick. Insulation score 80/100 is relative to 32 entries — metals lose, VIPs and aerogels win. Fire letter in editorial use: A1. Do not equate A1 with “safe in a blaze” or E with “illegal”. Assemblies decide.

Origin: 1940s–60s US/JP; EU RCF classification 1990s, United States / Japan / EU. The process chapter follows feedstock → conversion → forming → finish → install. Uses span buildings to defence / safety. Pairings matter: mineral-wool. Circularity mark 34/100. Ask which scrap, which certificate, which year.