| http://www.w3.org/ns/prov#value | - 1, n is an integer of at least 2, and z is an integer of from 1 to 3, said polymeric reaction product having isocyanate-derived linkages consisting essentially of isocyanurate and urethane linkages; wherein the crosslink density of said reaction product is in the range of about one crosslink per 400 to 800 atomic weight units; wherein said glass spheres are 2 to 20 percent by volume of said foam;
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