over 0 050 inch thick do not conform well to molding forces and give relatively lower strengths larger particles generally have higher bulk density properties this is not always the case as described previously for planer shavings where because of the curl the shavings have a relatively low bulk density in any event the selection of proper material for the manufacture of a 34 no flow 34 molded structural member becomes a tradeoff between materials having low bulk density and low strength and those having a high strength but a high bulk density particle size selection will vary therefore with the die configuration and product strength requirements and may be a combination of sizes and types as described in a previous section the cellulosic material is prepared in a manner consistent with that employed in manufacturing regular particleboard the material is first dried and then sprayed coated or mixed with a suitable adhesive binding usually a synthetic thermosetting resin amounting to from 3 to 8 percent of the ovendry o d weight of the raw fibrous material suitable binders such as urea formaldehyde phenolformaldehyde resorcinol melamine urethane or isocyanate may be used other substances may be added at this stage.