In year the first example of polymer synthesis

This high value of process rejection rate does not, however, mean that this much lead was “wasted” in the production; in fact only a very small part of the 1.4762 tons of rejected lead was discharged into the environment; the rest was recycled or reused (quantities and other details are discussed in the following sections). This large amount of rejected materials also explains why the indicator of resource efficiency for the SKS lead smelting process received such a high score—81.28%, denoting that 81.28% of the one ton of lead concentrate and other lead-containing materials was transformed into the final product (the lead ingot).