4 Lb. Density Expanding Pour Foam, 2 Part Polyurethane Closed Cell Liquid Foam for Boat and Dock Flotation, Soundproofing, Filling Voids, and Insulation (1 Gallon Kit): Amazon.com: Industrial & Scientific
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High Quality Elastic Open Cell American Standard 55 Gallon PU Polyurethane Foam Material for Sound Insulation - China ISO Mdi Rigid Elastic, Roof Sheet Ground Tanks | Made-in-China.com
4# Density Foam - Aeromarine Products Inc.
Huntsman Building Solutions Heatlok HFO High Lift Closed-Cell Spray Foam