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Because refractory ceramic fibers (RCF) were classified as possibly pathogenic to humans, alkaline earth silicate (AES) wools have been used as a substitute product for high-temperature applications. All in vivo assays developed to evaluate its pathogenicity were assessed using as-received AES samples. The classification as a pathogen does not apply if the retention half-time for fibers longer than 20 μm is less than 40 days. Therefore, this work describes the evaluation of one AES sample afterdoi:10.1590/0366-69132019653732456 fatcat:u3krxw4gt5cylbfdup6zbjltdu