Review of Filler and Extender Quality Evaluation

Changes in primary extender filler for softwood plywood have aroused interest in quality and evaluation of fillers and extenders. Recent technical sessions and reports have focused attention on research and experience with various extenders and fillers. Some alternate products are discussed. Confusing nomenclature is discussed with a proposal to term the lignocellulosic/mineral components fillers and the protein-starch components extenders. Raw material sources and practical quality control procedures are related to the technical-economical considerations in making plywood.

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