一种深棕色、中等粘度、高反应性、总异氰酸酯含量约为 30%、平均官能度为 3.2 的聚亚甲基多苯基异氰酸酯。该产品是专为生产 PUR 和 PIR（连续和不连续）块状泡沫而设计的。与 VORANATE™ M 590 相比，它的官能度较高且具有中等粘度，因此非常适合用于某些连续和不连续层压工艺。增加的官能度带来改善的泡沫固化性、优异的强度性能和更佳的尺寸稳定性。
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