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Nomex
DuPont’s meta-aramid — fire-fighter turnout, electrical paper and a char that does not melt-drip like nylon.
Overall 65 🌡️Ceramic fibre
Spun refractory fibres for 1000–1400 °C — kiln linings, gaskets, and a respirable-fibre caution that AES grades try to ease.
Overall 62 🏠Gypsum board
CaSO4·2H2O panels that buy fire time by calcining — the everyday A2/A1 lining of interiors.
Overall 59 🧯Intumescent coating
Paints that swell into insulating char — the thin-film way to give steel an R-rating without bulky boards.
Overall 58