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.
The focus of reciprocity is centered more on trading favors than making a negotiation or a contract with another person. With reciprocity, a small favor can produce a sense of obligation to a larger return favor. This feeling of obligation allows an action to be reciprocated with another action.