| abstract |
There are at least two extruded thermoplastic polymer foam pieces that fit together to form a foam having a generally annular cross section, each piece being adjacent to a concave surface and defining a hole in the generally annular cross section. Concave to form an inner edge, each piece having a density of less than 36 kilograms per cubic meter, a product of density and average bubble diameter that is less than 17 millimeters * kilogram per cubic meter, and 35 milliwatts per meter * Kelvin or less An article having a thermal conductivity of [Selection] Figure 3 |