STDCera: Refractory fibre made from alumina and silica. AZSCerachem: Refractory fibre made from Alumina, Silica and Zironia. All above fibres are resistant to chemical attack, except for hydrofluoric and phosphoric acids and strong alkalies. Expansion joints, Patching and emergency repairs in furnaces, Boilers, Heaters etc. Loose insulating fill for crowns and walls of kilns and furnaces. Packing material for temporary repair of insulation.