Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties

Child Classifications

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• D21H 21/02 Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control (removal of fats, resins, pitch, or waxes D21C9/08)
• D21H 21/06 Paper forming aids
• D21H 21/14 characterised by function or properties in or on the paper (D21H19/66, D21H27/02 take precedence)
• D21H 21/50 characterised by form (D21H19/66, D21H21/42, D21H27/02 take precedence)