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.
Reciprocity (social and political philosophy), the concept of reciprocity as in-kind positive or negative responses for the actions of others; relation to justice; related ideas such as gratitude, mutuality, and the Golden Rule