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Publication of BE691516ApublicationCriticalpatent/BE691516A/fr
D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
D21H13/36—Inorganic fibres or flakes
D21H13/38—Inorganic fibres or flakes siliceous
D21H13/42—Asbestos
D—TEXTILES; PAPER
D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
D21H5/00—Special paper or cardboard not otherwise provided for
D21H5/12—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials
D21H5/18—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of inorganic fibres with or without cellulose fibres
D21H5/183—Special paper or cardboard not otherwise provided for characterised by the use of special fibrous materials of inorganic fibres with or without cellulose fibres of asbestos fibres