Foams based on Phenolic and Urea-Formaldehyde Resins Mixtures and their Applications for Heat Insulation of Pipelines. 2. Development of the Process for Producing Grade FL-3 Phenolic Foam and Method of its Application to Pipes *

Abstract

A detailed description of the preparation of a casting type foam based on phenolic and urea-formaldehyde resin mixtures is presented. The option of an optimal content of urea-formaldehyde resin as well as optimal processing parameters are outlined. Foam with maximum apparent density and minimum shrinkage is formulated. Pouring technique and the process of application of foam insulation to metal pipes are described. Practical recommendations for the production of foam insulation are given.