Urethane Foams for Navy Pontoon Structures

摘要

The application, advantages, and limitations of foamed-in-place urethane materials for Navy field activities are described. Brief descriptions of the chemical and physical changes that occur during foaming, properties of rigid foams, and different methods of foaming are also presented. Results of limited laboratory testing indicate that urethane foams can be prepared successfully by field activities with little or no previous experience with them if care is taken to (1) thoroughly mix the components, (2) obtain proper ratio of components, (3) avoid contamination of the mixture and forms, especially with water, and (4) avoid excessive heat in large pours. Such foams can be and have been inserted in Navy pontoons and other floating structures. (Author)