Polycarbonate Diols (PCD) are used for a wide range of polyurethane-based coating formulations, providing an extreme durability and a high performance to the final polymer. ok
In mathematics, a reciprocity law is a generalization of the law of quadratic reciprocity. There are several different ways to express reciprocity laws.
Norm of reciprocity, social norm of in-kind responses to the behavior of others. Reciprocity (cultural anthropology), way of defining people's informal exchange of goods and labour. Reciprocity (evolution), mechanisms for the evolution of cooperation.