Effect of foam density on the properties of water blown rigid polyurethane foam

By M. Thirumal, D. Khastgir, N. Singha, B. S. Manjunath, Y. Naik. 2008

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Kraft Lignin-Based Rigid Polyurethane Foam (2012, background): “According to the literature,[42] density plays an important role in the mechanical performance of rigid PU foam and their relationship can be depicted by Power law.”
Polyurethane Composite Foams in High-Performance Applications: A Review (2018, background): “Polyurethane foams are of various types including rigid polyurethane, flexible polyurethane, and semirigid polyurethane([16,17]).”
Polyurethane foams based on modified tung oil and reinforced with rice husk ash I: Synthesis and physical chemical characterization (2013, background): “It is known that high water content produces more CO2 during the foam formation, resulting in a low final density [25,26].”
Flame‐retardant rigid polyurethane foam with a phosphorus‐nitrogen single intumescent flame retardant (2018, background): “increase of DPPM particles embedded in the cell wall and the decrease of cell volume.(25,26) Meanwhile, the compressive strength of the DPPM(25)‐RPUF was only decreased by 25.”