Abstract: A foam product comprising an expanded foam body having cells defined therein and blowing agent held within the cells, wherein at least 5% by weight of the foam body is formed from at least one component from a renewable source.

Abstract: A method of producing a polyurethane or polyisocyanurate foam is provided which involves the use of a specific combination of hydrofluoroolefin blowing agents and cell nucleators. The resulting foams have excellent long term thermal insulating performance and have reduced thickness in comparison to conventional thermal insulating boards. The rigid polyurethane and polyisocyanurate boards may be used to insulate refrigeration bodies, such as those employed in vehicles comprising refrigeration units, and cold storage containers.