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Therlllalinsulating11rebricksofAl:O;-SiO,systemwithgoodthen.nalinsulatingabilityusLlallyhaveaservicetemperaturebelow1700oC[l--3].Olherfirebricks,suchasalumiTlabubblefirebricks.zirconbtlbblefireblfickshavehigherserxzicetemperaturetipto1800alld1900"C[.