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.
Although the benefits of reciprocity have been mentioned above, it is vitally important not to âgive and expect to receiveâ. Reciprocity only works when a good deed is done with no expectation of return. The sincerity of the gesture is what gives it its power. The need to return a favour is strongest when the initial favour was done with no expectation of ârepaymentâ.