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The common type A sheet metal screw has been replaced by type AB. To compare the face and edge withdrawal resistance of types A and AB screws, the Forest Products Laboratory evaluated their performance in eight particleboards and three medium-density hardboards. All testing was conducted in accordance with ASTM D 1037-72 except a 0.136-inch-diameter pilot hole was used to facilitate insertion of the screws. In the particleboards, face withdrawal resistance of type AB screws averaged approximately 5 percent less than for type A screws. Results for edge withdrawal in particleboard were erratic because of the differences in makeup of the center portion of each board. In the hardboards, average face and edge withdrawal resistance of type AB screws was approximately 10% less than of type A screws.
This book provides the latest technical information on sustainable materials that are feedstocks for additive manufacturing (AM). Topics covered include an up-to-date and extensive overview of raw materials, their chemistry, and functional properties of their commercial versions; a description of the relevant AM processes, products, applications, advantages, and limitations; prices and market data; and a forecast of sustainable materials used in AM, their properties, and applications in the near future. Data included are relative to current commercial products and are presented in easy-to-read tables and charts. Features Highlights up-to-date information and data of actual commercial materials Offers a broad survey of state-of the-art information Forecasts future materials, applications, and areas of R&D Contains simple language, explains technical terms, and minimizes technical lingo Includes over 200 tables, nearly 200 figures, and more than 1,700 references to technical publications, mostly very recent Handbook of Sustainable Polymers for Additive Manufacturing appeals to a diverse audience of students and academic, technical, and business professionals in the fields of materials science and mechanical, chemical, and manufacturing engineering.