| abstract |
A low brittle phenol resin foam using hydrofluoroolefin as a foaming agent and a method for producing the same. A phenol resin foam containing a fluorine-containing halogenated unsaturated hydrocarbon, having a density of 20 kg / m 3 or more and 50 kg / m 3 or less, and a closed cell ratio of 80% or more and 99% or less, A phenolic resin foam having a thermal conductivity of less than 0.0190 W / m ยท K and an amount of fluorine in the bubble wall of 5000 mg / kg or less. [Selection figure] None |