IMPROVEMENTS IN INSULATING MATERIALS

摘要

Polyurethane precursor components are mixed on site immediately prior to or concurrently with application of the mixed and reacting polyurethane to a site of use, in separate mixing stages wherein in one stage at least one precursor component is mixed with glass or other microspheres, and in a second concurrent or immediately prior or subsequent mixing stage wherein the precursor components are mixed to form a polyurethane reaction mixture which is applied to the site of use. One or both of the precursor components may be mixed with the microspheres in the first mixing stage, and mixing stages may be performed together in a single mixing operation.