Contents Introduction 1.1. Background of Polyurethane Rigid Foam 1.2. Role of Catalysts in Polyurethane Foam Formation 1.3. Introducing PC-8 Chemical Nature and Properties of PC-8 2.1. Chemical Structure and Composition 2.2. Physical and Chemical Properties 2.3. Reaction Mechanism PC-8’s Influence on Cream Time 3.1. Cream Time Defined 3.2. Mechanism of Cream Time Reduction by PC-8...