Avoid cross contamination of resins during grinding by either using dedicated grinders for each resin type or institute procedures to assure that all grinders are completely dismantled and each component wiped clean during material changeovers. Unfilled versions of a resin are usually more valuable than filled versions. Avoid grinding coated, painted, decorated or materials containing inserts together with pure materials - the purer the material, the better. Natural is always worth more than colors. Separated colors may be worth more than mixed colors.
Pure black is normally worth more than mixed colors.
Strap or stretch wrap containers on pallets. Make sure that pallets are secure enough to be stacked two or three high. Fill all packages completely. This should keep it from getting crushed in transit by having had a full carton loaded on top of it. Label all packages clearly to avoid any confusion as to their contents.