Polyurethane foam and methods of forming the same

A polyurethane foam comprising:

• a first polyol component comprising a polyether polyol having a functionality of at least about 5;
• and
• a second polyol component comprising at least one component selected from the group of a polyether polyol having a functionality of not greater than about 4, and a polyester polyol having a functionality of not greater than about 4,
• wherein the polyurethane foam comprises a density of not greater than about 200 kg/m3,
• wherein the polyurethane foam comprises a HBF rating based on a UL94 flame retardancy test performed at a polyurethane foam thickness of 1.0 mm.

A method of forming a polyurethane foam comprising:

• providing a raw material mixture comprising:
• a raw first polyol component comprising a polyether polyol having a functionality of at least about 5;
• and
• a raw second polyol component comprising at least one component selected from the group of a polyether polyol having a functionality of not greater than about 4, and a polyester polyol having a functionality of not greater than about 4, and
• forming the raw material mixture into a polyurethane foam,
• wherein the polyurethane foam comprises a density of not greater than about 200 kg/m3,
• wherein the polyurethane foam comprises a compression curve ratio CFD70/CFD10 of not greater than about 10, where CFD70 is equal to the compression force deflection (CFD) of the polyurethane foam measured at a 70% compression ratio and CFD10 is equal to the compression force deflection (CFD) of the polyurethane foam measured at a 10% compression ratio.